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1129634-44-1

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1129634-44-1 Usage

Uses

(S)-5-Boc-5-azaspiro[2.4]heptane-6-carboxylic Acid is a spiro cyclopropyl proline derivative that may inhibit peptide deformylase (PDF) to help fight against horrifying antibiotics resistance.

Check Digit Verification of cas no

The CAS Registry Mumber 1129634-44-1 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,1,2,9,6,3 and 4 respectively; the second part has 2 digits, 4 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 1129634-44:
(9*1)+(8*1)+(7*2)+(6*9)+(5*6)+(4*3)+(3*4)+(2*4)+(1*4)=151
151 % 10 = 1
So 1129634-44-1 is a valid CAS Registry Number.

1129634-44-1SDS

SAFETY DATA SHEETS

According to Globally Harmonized System of Classification and Labelling of Chemicals (GHS) - Sixth revised edition

Version: 1.0

Creation Date: Aug 17, 2017

Revision Date: Aug 17, 2017

1.Identification

1.1 GHS Product identifier

Product name (S)-5-(tert-butoxycarbonyl)-5-azaspiro[2.4]heptane-6-carboxylic acid

1.2 Other means of identification

Product number -
Other names (6S)-5-[(2-methylpropan-2-yl)oxycarbonyl]-5-azaspiro[2.4]heptane-6-carboxylic acid

1.3 Recommended use of the chemical and restrictions on use

Identified uses For industry use only.
Uses advised against no data available

1.4 Supplier's details

1.5 Emergency phone number

Emergency phone number -
Service hours Monday to Friday, 9am-5pm (Standard time zone: UTC/GMT +8 hours).

More Details:1129634-44-1 SDS

1129634-44-1Synthetic route

(6S)-5-tert-butyl 6-methyl 5-azaspiro[2.4]heptane-5,6-dicarboxylate
1129634-43-0

(6S)-5-tert-butyl 6-methyl 5-azaspiro[2.4]heptane-5,6-dicarboxylate

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

Conditions
ConditionsYield
Stage #1: (6S)-5-tert-butyl 6-methyl 5-azaspiro[2.4]heptane-5,6-dicarboxylate With lithium hydroxide monohydrate; water In ethanol at 20℃; for 20h;
Stage #2: With hydrogenchloride In water pH=2; Ice bath;
100%
With water; sodium hydroxide In ethanol for 24h;34%
With water; lithium hydroxide In tetrahydrofuran; methanol at 60℃; for 16h;
With water; lithium hydroxide In tetrahydrofuran at 20℃;2.4 g
(6S)-5-(tert-butoxycarbonyl)-5-azaspiro[2.4]heptane-6-carboxylic acid R-α-methylbenzylamine salt

(6S)-5-(tert-butoxycarbonyl)-5-azaspiro[2.4]heptane-6-carboxylic acid R-α-methylbenzylamine salt

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

Conditions
ConditionsYield
With hydrogenchloride In Isopropyl acetate; water at 0℃; pH=3 - 4;100%
di-tert-butyl dicarbonate
24424-99-5

di-tert-butyl dicarbonate

(S)-5-azaspiro[2.4]heptane-6-carboxylic acid D-di-p-methylbenzoyltartrate

(S)-5-azaspiro[2.4]heptane-6-carboxylic acid D-di-p-methylbenzoyltartrate

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

Conditions
ConditionsYield
Stage #1: (S)-5-azaspiro[2.4]heptane-6-carboxylic acid D-di-p-methylbenzoyltartrate With hydrogenchloride In dichloromethane; water for 0.333333h; pH=2-3;
Stage #2: di-tert-butyl dicarbonate With sodium hydroxide In dichloromethane; water at 0 - 50℃; pH=10-11;
100%
(6S)-1,1-dibromo-5-(tert-butoxycarbonyl)-5-azaspiro[2.4]heptane-6-carboxylic acid
1412903-77-5

(6S)-1,1-dibromo-5-(tert-butoxycarbonyl)-5-azaspiro[2.4]heptane-6-carboxylic acid

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

Conditions
ConditionsYield
With leaded bronze CuSn7Pb15 In methanol; N,N-dimethyl-formamide at 25℃; Reagent/catalyst; Solvent; Electrolysis;98%
With N-methyl-N,N,N-triethylammonium methylsulfate In N,N-dimethyl-formamide at 25℃; Electrolysis;93%
With palladium 10% on activated carbon; hydrogen; potassium hydroxide In isopropyl alcohol at 40℃; under 760.051 Torr; Inert atmosphere;82%
C28H34N2O5

C28H34N2O5

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

Conditions
ConditionsYield
With sodium hydroxide In tetrahydrofuran at 0 - 20℃; for 4h;97%
di-tert-butyl dicarbonate
24424-99-5

di-tert-butyl dicarbonate

(S)-5-azaspiro[2.4]heptane-6-carboxylic acid D-tartrate

(S)-5-azaspiro[2.4]heptane-6-carboxylic acid D-tartrate

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

Conditions
ConditionsYield
Stage #1: di-tert-butyl dicarbonate; (S)-5-azaspiro[2.4]heptane-6-carboxylic acid D-tartrate With hydrogenchloride In dichloromethane; water pH=2;
Stage #2: di-tert-butyl dicarbonate With sodium hydroxide In dichloromethane; water at 0 - 20℃; for 15h; pH=10;
93%
C13H22BrNO4

C13H22BrNO4

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

Conditions
ConditionsYield
Stage #1: C13H22BrNO4 With sodium hydride In tetrahydrofuran at 0 - 50℃; for 10h;
Stage #2: With sodium hydroxide In tetrahydrofuran; water at 50℃; for 5h; Solvent; Reagent/catalyst;
92%
(6S)-5-tert-butyl 6-methyl 1,1-dibromo-5-azaspiro[2.4]heptane-5,6-dicarboxylate
1412903-76-4

(6S)-5-tert-butyl 6-methyl 1,1-dibromo-5-azaspiro[2.4]heptane-5,6-dicarboxylate

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

Conditions
ConditionsYield
With V-50; hypophosphorous acid; triethylamine In water at 100℃;79%
Multi-step reaction with 2 steps
1: water; lithium hydroxide monohydrate / tetrahydrofuran; methanol / 1.5 h / 20 °C
2: 2,2'-azobis(isobutyronitrile); tris-(trimethylsilyl)silane / toluene / 7 h / 110 °C
View Scheme
C14H23NO4

C14H23NO4

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

Conditions
ConditionsYield
With water; lithium hydroxide In 2-methyltetrahydrofuran at 50℃;71%
(S)-6-hydroxymethyl-5-azaspiro[2.4]heptane-5-carboxylic acid tert-butyl ester
1262397-12-5

(S)-6-hydroxymethyl-5-azaspiro[2.4]heptane-5-carboxylic acid tert-butyl ester

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

Conditions
ConditionsYield
With Jones reagent In acetone at 0 - 37℃; for 2h;70%
(±)-5-(tert-butoxycarbonyl)-5-azaspiro[2.4]heptane-6-carboxylic acid

(±)-5-(tert-butoxycarbonyl)-5-azaspiro[2.4]heptane-6-carboxylic acid

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

Conditions
ConditionsYield
With (1S,2R)-1-amino-2-indanol In 2-methyltetrahydrofuran at 55℃; for 1.16667h;33%
Multi-step reaction with 2 steps
1: 2-methyltetrahydrofuran / 1 h / 55 °C
2: hydrogenchloride / water; 2-methyltetrahydrofuran / 0.5 h
View Scheme
Multi-step reaction with 2 steps
1: isopropyl alcohol; Isopropyl acetate / 60 °C
2: hydrogenchloride / water; Isopropyl acetate / 0 °C / pH 3 - 4
View Scheme
di-tert-butyl dicarbonate
24424-99-5

di-tert-butyl dicarbonate

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

Conditions
ConditionsYield
Multi-step reaction with 5 steps
1.1: triethylamine
2.1: sodium periodate; ruthenium trichloride
4.1: diethylzinc; trifluoroacetic acid / hexane; dichloromethane / 1 h / -5 °C / Inert atmosphere
4.2: 72 h / -5 - 30 °C / Inert atmosphere
4.3: 24 h / 20 °C
5.1: water; sodium hydroxide / ethanol / 24 h
View Scheme
Multi-step reaction with 5 steps
1.1: triethylamine
2.1: sodium periodate; ruthenium trichloride
4.1: diethylzinc; trifluoroacetic acid / hexane; dichloromethane / 1 h / -5 °C / Inert atmosphere
4.2: 72 h / -5 - 30 °C / Inert atmosphere
5.1: water; sodium hydroxide / ethanol / 24 h
View Scheme
(S)-1-tert-butyl 2-methyl 4-methylenepyrrolidine-1,2-dicarboxylate
84348-39-0

(S)-1-tert-butyl 2-methyl 4-methylenepyrrolidine-1,2-dicarboxylate

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

Conditions
ConditionsYield
Multi-step reaction with 2 steps
1.1: diethylzinc; trifluoroacetic acid / hexane; dichloromethane / 1 h / -5 °C / Inert atmosphere
1.2: 72 h / -5 - 30 °C / Inert atmosphere
1.3: 24 h / 20 °C
2.1: water; sodium hydroxide / ethanol / 24 h
View Scheme
Multi-step reaction with 2 steps
1.1: diethylzinc; trifluoroacetic acid / hexane; dichloromethane / 1 h / -5 °C / Inert atmosphere
1.2: 72 h / -5 - 30 °C / Inert atmosphere
2.1: water; sodium hydroxide / ethanol / 24 h
View Scheme
Multi-step reaction with 3 steps
1.1: tetrabutylammomium bromide / 1,2-dichloro-ethane / 3.17 h / 70 °C / Inert atmosphere
2.1: 2,2'-azobis(isobutyronitrile); tris-(trimethylsilyl)silane / toluene / 24 h / 0 - 90 °C
3.1: water; lithium hydroxide monohydrate / ethanol / 20 h / 20 °C
3.2: pH 2 / Ice bath
View Scheme
4R-4-hydroxyproline
51-35-4

4R-4-hydroxyproline

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

Conditions
ConditionsYield
Multi-step reaction with 6 steps
1.1: thionyl chloride
2.1: triethylamine
3.1: sodium periodate; ruthenium trichloride
5.1: diethylzinc; trifluoroacetic acid / hexane; dichloromethane / 1 h / -5 °C / Inert atmosphere
5.2: 72 h / -5 - 30 °C / Inert atmosphere
5.3: 24 h / 20 °C
6.1: water; sodium hydroxide / ethanol / 24 h
View Scheme
Multi-step reaction with 6 steps
1.1: thionyl chloride
2.1: triethylamine
3.1: sodium periodate; ruthenium trichloride
5.1: diethylzinc; trifluoroacetic acid / hexane; dichloromethane / 1 h / -5 °C / Inert atmosphere
5.2: 72 h / -5 - 30 °C / Inert atmosphere
6.1: water; sodium hydroxide / ethanol / 24 h
View Scheme
(S)-1-(tert-butoxycarbonyl)-4-methylenepyrrolidine-2-carboxylic acid
84348-38-9

(S)-1-(tert-butoxycarbonyl)-4-methylenepyrrolidine-2-carboxylic acid

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

Conditions
ConditionsYield
Multi-step reaction with 4 steps
1.1: potassium carbonate; N,N-dimethyl-formamide / 7 h / 20 °C
2.1: tetrabutylammomium bromide / 1,2-dichloro-ethane / 3.17 h / 70 °C / Inert atmosphere
3.1: 2,2'-azobis(isobutyronitrile); tris-(trimethylsilyl)silane / toluene / 24 h / 0 - 90 °C
4.1: water; lithium hydroxide monohydrate / ethanol / 20 h / 20 °C
4.2: pH 2 / Ice bath
View Scheme
Multi-step reaction with 4 steps
1: potassium carbonate; N,N-dimethyl-formamide / 7 h / 20 °C
2: tetrabutylammomium bromide / 1,2-dichloro-ethane / 3.17 h / 70 °C / Inert atmosphere
3: water; lithium hydroxide monohydrate / tetrahydrofuran; methanol / 1.5 h / 20 °C
4: 2,2'-azobis(isobutyronitrile); tris-(trimethylsilyl)silane / toluene / 7 h / 110 °C
View Scheme
Multi-step reaction with 2 steps
1: benzyltrimethylammonium chloride; sodium hydroxide / dichloromethane / 33 - 38 °C
2: palladium 10% on activated carbon; potassium hydroxide; hydrogen / isopropyl alcohol / 40 °C / 760.05 Torr / Inert atmosphere
View Scheme
Multi-step reaction with 2 steps
1: sodium hydroxide; benzyltrimethylammonium chloride / dichloromethane / 1 h / 28 - 38 °C
2: potassium hydroxide; 8 % Pd/C; hydrogen / isopropyl alcohol / 38 °C / 1520.1 Torr
View Scheme
Multi-step reaction with 3 steps
1.1: potassium carbonate / N,N-dimethyl-formamide / 20 °C
2.1: trifluoroacetic acid; diethylzinc / dichloromethane; hexane / 2 h / 5 °C / Inert atmosphere
2.2: 90 h / Inert atmosphere
3.1: water; lithium hydroxide / tetrahydrofuran / 20 °C
View Scheme
(3R,7aS)-3-phenyl-tetrahydro-pyrrolo[1,2-c]oxazol-5-one
103201-79-2

(3R,7aS)-3-phenyl-tetrahydro-pyrrolo[1,2-c]oxazol-5-one

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

Conditions
ConditionsYield
Multi-step reaction with 7 steps
1.1: lithium hexamethyldisilazane / tetrahydrofuran / 2 h / -50 - -40 °C
1.2: 0.5 h / -55 - -45 °C
2.1: potassium hydrogencarbonate / methanol; water / 10 - 50 °C
3.1: potassium tert-butylate / tetrahydrofuran / 1 h / 10 - 60 °C
3.2: 10 - 60 °C
4.1: lithium aluminium tetrahydride / tetrahydrofuran / 1.5 h / 50 - 60 °C
5.1: palladium 10% on activated carbon; ammonium formate / methanol; water / 10 - 50 °C / Inert atmosphere
6.1: dichloromethane / 20 - 45 °C
6.2: 20 °C
7.1: Jones reagent / acetone / 2 h / 0 - 37 °C
View Scheme
C15H20N2O2

C15H20N2O2

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

Conditions
ConditionsYield
Multi-step reaction with 6 steps
1.1: potassium hydrogencarbonate / methanol; water / 10 - 50 °C
2.1: potassium tert-butylate / tetrahydrofuran / 1 h / 10 - 60 °C
2.2: 10 - 60 °C
3.1: lithium aluminium tetrahydride / tetrahydrofuran / 1.5 h / 50 - 60 °C
4.1: palladium 10% on activated carbon; ammonium formate / methanol; water / 10 - 50 °C / Inert atmosphere
5.1: dichloromethane / 20 - 45 °C
5.2: 20 °C
6.1: Jones reagent / acetone / 2 h / 0 - 37 °C
View Scheme
(3R,7aS)-6-methylene-3-phenyltetrahydropyrrolo[1,2-c]oxazol-5(1H)-one
958275-39-3

(3R,7aS)-6-methylene-3-phenyltetrahydropyrrolo[1,2-c]oxazol-5(1H)-one

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

Conditions
ConditionsYield
Multi-step reaction with 5 steps
1.1: potassium tert-butylate / tetrahydrofuran / 1 h / 10 - 60 °C
1.2: 10 - 60 °C
2.1: lithium aluminium tetrahydride / tetrahydrofuran / 1.5 h / 50 - 60 °C
3.1: palladium 10% on activated carbon; ammonium formate / methanol; water / 10 - 50 °C / Inert atmosphere
4.1: dichloromethane / 20 - 45 °C
4.2: 20 °C
5.1: Jones reagent / acetone / 2 h / 0 - 37 °C
View Scheme
(3’R,7a’S)-3’-phenyldihydro-1‘H-spiro[cyclopropane-1,6’-pyrrolo[1,2-c][1,3]oxazol]-5’-one
1431322-84-7

(3’R,7a’S)-3’-phenyldihydro-1‘H-spiro[cyclopropane-1,6’-pyrrolo[1,2-c][1,3]oxazol]-5’-one

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

Conditions
ConditionsYield
Multi-step reaction with 4 steps
1.1: lithium aluminium tetrahydride / tetrahydrofuran / 1.5 h / 50 - 60 °C
2.1: palladium 10% on activated carbon; ammonium formate / methanol; water / 10 - 50 °C / Inert atmosphere
3.1: dichloromethane / 20 - 45 °C
3.2: 20 °C
4.1: Jones reagent / acetone / 2 h / 0 - 37 °C
View Scheme
((S)-(5-benzyl-5-azaspiro[2.4]heptan-6-yl)methanol)
1431322-85-8

((S)-(5-benzyl-5-azaspiro[2.4]heptan-6-yl)methanol)

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

Conditions
ConditionsYield
Multi-step reaction with 3 steps
1.1: palladium 10% on activated carbon; ammonium formate / methanol; water / 10 - 50 °C / Inert atmosphere
2.1: dichloromethane / 20 - 45 °C
2.2: 20 °C
3.1: Jones reagent / acetone / 2 h / 0 - 37 °C
View Scheme
(S)-1-(5-azaspiro[2.4]hept-6-yl)methanol
1431322-86-9

(S)-1-(5-azaspiro[2.4]hept-6-yl)methanol

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

Conditions
ConditionsYield
Multi-step reaction with 2 steps
1.1: dichloromethane / 20 - 45 °C
1.2: 20 °C
2.1: Jones reagent / acetone / 2 h / 0 - 37 °C
View Scheme
(S)-Pyroglutaminol
17342-08-4

(S)-Pyroglutaminol

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

Conditions
ConditionsYield
Multi-step reaction with 8 steps
1.1: toluene-4-sulfonic acid / toluene / Reflux; Dean-Stark
2.1: lithium hexamethyldisilazane / tetrahydrofuran / 2 h / -50 - -40 °C
2.2: 0.5 h / -55 - -45 °C
3.1: potassium hydrogencarbonate / methanol; water / 10 - 50 °C
4.1: potassium tert-butylate / tetrahydrofuran / 1 h / 10 - 60 °C
4.2: 10 - 60 °C
5.1: lithium aluminium tetrahydride / tetrahydrofuran / 1.5 h / 50 - 60 °C
6.1: palladium 10% on activated carbon; ammonium formate / methanol; water / 10 - 50 °C / Inert atmosphere
7.1: dichloromethane / 20 - 45 °C
7.2: 20 °C
8.1: Jones reagent / acetone / 2 h / 0 - 37 °C
View Scheme
Chloroiodomethane
593-71-5

Chloroiodomethane

(S)-1-(tert-butoxycarbonyl)-4-methylenepyrrolidine-2-carboxylic acid
84348-38-9

(S)-1-(tert-butoxycarbonyl)-4-methylenepyrrolidine-2-carboxylic acid

A

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

B

C11H16INO4

C11H16INO4

Conditions
ConditionsYield
Stage #1: Chloroiodomethane; (S)-1-(tert-butoxycarbonyl)-4-methylenepyrrolidine-2-carboxylic acid With diethylzinc In n-heptane; dichloromethane at -5 - 20℃; for 19.5h;
Stage #2: With lithium hydroxide monohydrate; water In methanol at 15 - 25℃; for 13.5h;
Stage #3: With iodine; sodium hydrogencarbonate In water at 25℃; for 40h;
[1-(hydroxymethyl)cyclopropyl]methanol
39590-81-3

[1-(hydroxymethyl)cyclopropyl]methanol

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

Conditions
ConditionsYield
Multi-step reaction with 5 steps
1: triphenylphosphine; 1H-imidazole; iodine / dichloromethane / 2.5 h / 0 - 10 °C
2: sodium hydride / mineral oil; N,N-dimethyl acetamide / 1 h / 0 - 11 °C
3: water; lithium hydroxide / 2-methyltetrahydrofuran / 50 °C
4: 2-methyltetrahydrofuran / 1 h / 55 °C
5: hydrogenchloride / water; 2-methyltetrahydrofuran / 0.5 h
View Scheme
Multi-step reaction with 6 steps
1: triethylamine / acetone / 3 h / 0 - 20 °C
2: sodium iodide / acetone / 35 °C
3: sodium hydride / mineral oil; N,N-dimethyl acetamide / 1 h / 0 - 11 °C
4: water; lithium hydroxide / 2-methyltetrahydrofuran / 50 °C
5: 2-methyltetrahydrofuran / 1 h / 55 °C
6: hydrogenchloride / water; 2-methyltetrahydrofuran / 0.5 h
View Scheme
Multi-step reaction with 4 steps
1: triphenylphosphine; iodine; 1H-imidazole / dichloromethane / 3 h / 10 °C
2: sodium hydride / N,N-dimethyl acetamide; mineral oil / 4.5 h / 0 - 11 °C
3: lithium hydroxide; water / 2-methyltetrahydrofuran / 50 °C / Inert atmosphere
4: (1S,2R)-1-amino-2-indanol / 2-methyltetrahydrofuran / 1.17 h / 55 °C
View Scheme
[1-(hydroxymethyl)cyclopropyl]methanol
39590-81-3

[1-(hydroxymethyl)cyclopropyl]methanol

A

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

B

C14H23NO4

C14H23NO4

Conditions
ConditionsYield
Multi-step reaction with 3 steps
1: triphenylphosphine; 1H-imidazole; iodine / dichloromethane / 2.5 h / 0 - 10 °C
2: sodium hydride / mineral oil; N,N-dimethyl acetamide / 1 h / 0 - 11 °C
3: Novozym® 435 / aq. phosphate buffer; acetonitrile / 40 °C / pH 7 / Resolution of racemate
View Scheme
Multi-step reaction with 4 steps
1: triethylamine / acetone / 3 h / 0 - 20 °C
2: sodium iodide / acetone / 35 °C
3: sodium hydride / mineral oil; N,N-dimethyl acetamide / 1 h / 0 - 11 °C
4: Novozym® 435 / aq. phosphate buffer; acetonitrile / 40 °C / pH 7 / Resolution of racemate
View Scheme
1,1-bis(iodomethyl)cyclopropane
83321-23-7

1,1-bis(iodomethyl)cyclopropane

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

Conditions
ConditionsYield
Multi-step reaction with 4 steps
1: sodium hydride / mineral oil; N,N-dimethyl acetamide / 1 h / 0 - 11 °C
2: water; lithium hydroxide / 2-methyltetrahydrofuran / 50 °C
3: 2-methyltetrahydrofuran / 1 h / 55 °C
4: hydrogenchloride / water; 2-methyltetrahydrofuran / 0.5 h
View Scheme
Multi-step reaction with 3 steps
1: sodium hydride / N,N-dimethyl acetamide; mineral oil / 4.5 h / 0 - 11 °C
2: lithium hydroxide; water / 2-methyltetrahydrofuran / 50 °C / Inert atmosphere
3: (1S,2R)-1-amino-2-indanol / 2-methyltetrahydrofuran / 1.17 h / 55 °C
View Scheme
1,1-bis(iodomethyl)cyclopropane
83321-23-7

1,1-bis(iodomethyl)cyclopropane

A

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

B

C14H23NO4

C14H23NO4

Conditions
ConditionsYield
Multi-step reaction with 2 steps
1: sodium hydride / mineral oil; N,N-dimethyl acetamide / 1 h / 0 - 11 °C
2: Novozym® 435 / aq. phosphate buffer; acetonitrile / 40 °C / pH 7 / Resolution of racemate
View Scheme
picolinic acid hydrazide
1452-63-7

picolinic acid hydrazide

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

C18H24N4O4

C18H24N4O4

Conditions
ConditionsYield
Stage #1: (6S)-5-[(tert-butoxy)carbonyl]-5-azaspiro[2.4]heptane-6-carboxylic acid With 1-methyl-1H-imidazole; methanesulfonyl chloride In N,N-dimethyl-formamide at 0℃; for 0.25h;
Stage #2: picolinic acid hydrazide In N,N-dimethyl-d6-formamide for 6h;
100%
Stage #1: (6S)-5-[(tert-butoxy)carbonyl]-5-azaspiro[2.4]heptane-6-carboxylic acid With 1-methyl-1H-imidazole; methanesulfonyl chloride In N,N-dimethyl-formamide at 0℃; for 0.25h;
Stage #2: picolinic acid hydrazide In N,N-dimethyl-formamide for 6h;
100%
(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

C12H10BrF3O4S

C12H10BrF3O4S

C24H28F3NO8S

C24H28F3NO8S

Conditions
ConditionsYield
With triethylamine In acetonitrile at 0 - 20℃; for 2h;100%
(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

1-(7-bromo-9,9-difluoro-9-hydrofluoren-2-yl)-2-chloroethanone

1-(7-bromo-9,9-difluoro-9-hydrofluoren-2-yl)-2-chloroethanone

(S)-6-(2-(7-bromo-9,9-difluoro-9H-fluoren-2-yl)-2-oxoethyl) 5-tert-butyl 5-azaspiro[2.4]heptane-5,6-dicarboxylate

(S)-6-(2-(7-bromo-9,9-difluoro-9H-fluoren-2-yl)-2-oxoethyl) 5-tert-butyl 5-azaspiro[2.4]heptane-5,6-dicarboxylate

Conditions
ConditionsYield
Stage #1: (6S)-5-[(tert-butoxy)carbonyl]-5-azaspiro[2.4]heptane-6-carboxylic acid With potassium carbonate In acetone at 35℃; for 3h; Inert atmosphere;
Stage #2: 1-(7-bromo-9,9-difluoro-9-hydrofluoren-2-yl)-2-chloroethanone With sodium iodide In acetone at 35℃; for 3h;
97%
With potassium carbonate; potassium iodide In acetone at 60℃; for 3h;88%
With N-ethyl-N,N-diisopropylamine; potassium iodide In acetonitrile at 20℃; for 5h;
Stage #1: (6S)-5-[(tert-butoxy)carbonyl]-5-azaspiro[2.4]heptane-6-carboxylic acid With potassium tert-butylate In tetrahydrofuran at 30℃; for 25h;
Stage #2: 1-(7-bromo-9,9-difluoro-9-hydrofluoren-2-yl)-2-chloroethanone In acetone at 50℃; for 1.5h; Temperature;
(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

2-bromo-1-(4-iodophenyl)ethanone
31827-94-8

2-bromo-1-(4-iodophenyl)ethanone

C20H24INO5
1430104-98-5

C20H24INO5

Conditions
ConditionsYield
With N-ethyl-N,N-diisopropylamine In acetonitrile at 20℃; for 3h;96%
With N-ethyl-N,N-diisopropylamine In acetonitrile at 20℃; for 0.25h;
(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

(S)-6-hydroxymethyl-5-azaspiro[2.4]heptane-5-carboxylic acid tert-butyl ester
1262397-12-5

(S)-6-hydroxymethyl-5-azaspiro[2.4]heptane-5-carboxylic acid tert-butyl ester

Conditions
ConditionsYield
With borane-dimethyl sulfide complex In tetrahydrofuran at -4 - 24℃; for 4.5h; Solvent; Temperature;92.8%
With borane-THF
(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

methyl chloroformate
79-22-1

methyl chloroformate

C10H15NO4
1383708-08-4

C10H15NO4

Conditions
ConditionsYield
With triethylamine92%
(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

C8H10NO4(1-)*K(1+)

C8H10NO4(1-)*K(1+)

Conditions
ConditionsYield
With potassium tert-butylate In tetrahydrofuran; 2-methyltetrahydrofuran at 20 - 40℃; for 3h;86%
(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

(S)-5-(tert-butoxycarbonyl)-5-azaspiro[2.4]heptane-6-carboxylate
1441673-92-2

(S)-5-(tert-butoxycarbonyl)-5-azaspiro[2.4]heptane-6-carboxylate

Conditions
ConditionsYield
With potassium tert-butylate In 2-methyltetrahydrofuran at 20 - 40℃; for 3.5h;86%
With potassium tert-butylate In tetrahydrofuran at 10 - 40℃; for 6h;86%
(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

C21H15F2N3O*2ClH

C21H15F2N3O*2ClH

C45H49F2N5O7

C45H49F2N5O7

Conditions
ConditionsYield
With N-ethyl-N,N-diisopropylamine; N-[(dimethylamino)-3-oxo-1H-1,2,3-triazolo[4,5-b]pyridin-1-yl-methylene]-N-methylmethanaminium hexafluorophosphate In dichloromethane at 20℃;85%
(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

C21H17N3O*2ClH

C21H17N3O*2ClH

C45H51N5O7

C45H51N5O7

Conditions
ConditionsYield
With N-ethyl-N,N-diisopropylamine; N-[(dimethylamino)-3-oxo-1H-1,2,3-triazolo[4,5-b]pyridin-1-yl-methylene]-N-methylmethanaminium hexafluorophosphate In dichloromethane at 20℃;82%
(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

[6-[6-(trifluoromethyl)pyridin-3-yl]pyrimidin-4-yl]methanamine hydrochloride

[6-[6-(trifluoromethyl)pyridin-3-yl]pyrimidin-4-yl]methanamine hydrochloride

(S)-tert-butyl 6-(((6-(6-(trifluoromethyl)pyridin-3-yl)pyrimidin-4-yl)methyl)carbamoyl)-5-azaspiro[2.4]heptane-5-carboxylate

(S)-tert-butyl 6-(((6-(6-(trifluoromethyl)pyridin-3-yl)pyrimidin-4-yl)methyl)carbamoyl)-5-azaspiro[2.4]heptane-5-carboxylate

Conditions
ConditionsYield
With 2,4,6-tripropyl-1,3,5,2,4,6-trioxatriphosphinane-2,4,6-trioxide; N-ethyl-N,N-diisopropylamine In ethyl acetate at 20 - 60℃;76%
(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

trifluoroacetic acid
76-05-1

trifluoroacetic acid

(S)-6-carboxy-5-azaspiro[2.4]heptan-5-ium trifluoroacetate

(S)-6-carboxy-5-azaspiro[2.4]heptan-5-ium trifluoroacetate

Conditions
ConditionsYield
In dichloromethane at 0 - 20℃; for 16h;75%
In dichloromethane at 20℃; for 2h;
(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

benzyl chloroformate
501-53-1

benzyl chloroformate

(S)-5-((benzyloxy)carbonyl)-5-azaspiro[2.4]heptane-6-carboxylic acid
1256388-47-2

(S)-5-((benzyloxy)carbonyl)-5-azaspiro[2.4]heptane-6-carboxylic acid

Conditions
ConditionsYield
Stage #1: (6S)-5-[(tert-butoxy)carbonyl]-5-azaspiro[2.4]heptane-6-carboxylic acid With trifluoroacetic acid In dichloromethane at 20℃; for 3h;
Stage #2: benzyl chloroformate With sodium hydrogencarbonate In water at 0 - 20℃;
75%
pyrid-2-ylhydrazine
4930-98-7

pyrid-2-ylhydrazine

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

tert-butyl (S)-6-(2-(pyridin-2-yl)hydrazine-1-carbonyl)-5-azaspiro[2.4]heptane-5-carboxylate

tert-butyl (S)-6-(2-(pyridin-2-yl)hydrazine-1-carbonyl)-5-azaspiro[2.4]heptane-5-carboxylate

Conditions
ConditionsYield
Stage #1: (6S)-5-[(tert-butoxy)carbonyl]-5-azaspiro[2.4]heptane-6-carboxylic acid With 1-methyl-1H-imidazole; methanesulfonyl chloride In N,N-dimethyl-formamide at 0℃; for 0.25h;
Stage #2: pyrid-2-ylhydrazine In N,N-dimethyl-d6-formamide for 6h;
71%
Stage #1: (6S)-5-[(tert-butoxy)carbonyl]-5-azaspiro[2.4]heptane-6-carboxylic acid With 1-methyl-1H-imidazole; methanesulfonyl chloride In N,N-dimethyl-formamide at 0℃; for 0.25h;
Stage #2: pyrid-2-ylhydrazine In N,N-dimethyl-formamide for 6h;
71%
(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

N-cyclohexyl-2-fluoro-6-nitrobenzamide

N-cyclohexyl-2-fluoro-6-nitrobenzamide

tert-butyl (S)-6-(cyclohexyl(2-fluoro-6-nitrobenzoyl)carbamoyl)-5-azaspiro[2.4]heptane-5-carboxylate

tert-butyl (S)-6-(cyclohexyl(2-fluoro-6-nitrobenzoyl)carbamoyl)-5-azaspiro[2.4]heptane-5-carboxylate

Conditions
ConditionsYield
Stage #1: N-cyclohexyl-2-fluoro-6-nitrobenzamide With thionyl chloride In N,N-dimethyl-formamide at 80℃; for 2h; Inert atmosphere;
Stage #2: (6S)-5-[(tert-butoxy)carbonyl]-5-azaspiro[2.4]heptane-6-carboxylic acid With triethylamine In dichloromethane at 0 - 20℃; for 7h; Inert atmosphere;
56%
(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

2-amino-5-fluorobenzoic acid
446-08-2

2-amino-5-fluorobenzoic acid

aniline
62-53-3

aniline

tert-butyl (S)-6-(6-fluoro-4-oxo-3-phenyl-3,4-dihydroquinazolin-2-yl)-5-azaspiro[2.4]heptane-5-carboxylate

tert-butyl (S)-6-(6-fluoro-4-oxo-3-phenyl-3,4-dihydroquinazolin-2-yl)-5-azaspiro[2.4]heptane-5-carboxylate

Conditions
ConditionsYield
Stage #1: (6S)-5-[(tert-butoxy)carbonyl]-5-azaspiro[2.4]heptane-6-carboxylic acid; 2-amino-5-fluorobenzoic acid With pyridine; triphenyl phosphite at 70℃; Inert atmosphere;
Stage #2: aniline at 70℃; for 3h; Inert atmosphere;
54%
(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

N-cyclopentyl-2-fluoro-6-nitrobenzamide

N-cyclopentyl-2-fluoro-6-nitrobenzamide

tert-butyl (S)-6-(cyclopentyl(2-fluoro-6-nitrobenzoyl)carbamoyl)-5-azaspiro[2.4]heptane-5-carboxylate

tert-butyl (S)-6-(cyclopentyl(2-fluoro-6-nitrobenzoyl)carbamoyl)-5-azaspiro[2.4]heptane-5-carboxylate

Conditions
ConditionsYield
Stage #1: N-cyclopentyl-2-fluoro-6-nitrobenzamide With thionyl chloride In N,N-dimethyl-formamide at 80℃; for 2h; Inert atmosphere;
Stage #2: (6S)-5-[(tert-butoxy)carbonyl]-5-azaspiro[2.4]heptane-6-carboxylic acid With triethylamine In dichloromethane at 0 - 20℃; for 7h; Inert atmosphere;
53%
(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

2-amino-6-fluorobenzoic acid
434-76-4

2-amino-6-fluorobenzoic acid

aniline
62-53-3

aniline

tert-butyl (S)-6-(5-fluoro-4-oxo-3-phenyl-3,4-dihydroquinazolin-2-yl)-5-azaspiro[2.4]heptane-5-carboxylate

tert-butyl (S)-6-(5-fluoro-4-oxo-3-phenyl-3,4-dihydroquinazolin-2-yl)-5-azaspiro[2.4]heptane-5-carboxylate

Conditions
ConditionsYield
Stage #1: (6S)-5-[(tert-butoxy)carbonyl]-5-azaspiro[2.4]heptane-6-carboxylic acid; 2-amino-6-fluorobenzoic acid With pyridine; triphenyl phosphite at 70℃; Inert atmosphere;
Stage #2: aniline at 70℃; for 3h; Inert atmosphere;
53%
(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

para-bromophenacyl bromide
99-73-0

para-bromophenacyl bromide

C20H24BrNO5

C20H24BrNO5

Conditions
ConditionsYield
With N-ethyl-N,N-diisopropylamine In acetonitrile at 20℃; for 2h;50%
(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid
1129634-44-1

(6S)-(5-(tert-butoxycarbonyl))-5-azaspiro[2.4]heptane-6-carboxylic acid

2-chloro-6-aminobenzoic acid
2148-56-3

2-chloro-6-aminobenzoic acid

aniline
62-53-3

aniline

(S)-6-(3-phenyl-4-oxo-5-chloro-3,4-dihydroquinazolin-2-yl)-5-azaspiro[2.4]heptane-5-carboxylic acid tert-butyl ester

(S)-6-(3-phenyl-4-oxo-5-chloro-3,4-dihydroquinazolin-2-yl)-5-azaspiro[2.4]heptane-5-carboxylic acid tert-butyl ester

Conditions
ConditionsYield
Stage #1: (6S)-5-[(tert-butoxy)carbonyl]-5-azaspiro[2.4]heptane-6-carboxylic acid; 2-chloro-6-aminobenzoic acid With pyridine; triphenyl phosphite at 70℃; Inert atmosphere;
Stage #2: aniline for 3h; Inert atmosphere;
49%
Stage #1: (6S)-5-[(tert-butoxy)carbonyl]-5-azaspiro[2.4]heptane-6-carboxylic acid; 2-chloro-6-aminobenzoic acid With pyridine; triphenyl phosphite at 70℃; Inert atmosphere;
Stage #2: aniline at 70℃; for 3h; Inert atmosphere;
49%

1129634-44-1Relevant articles and documents

An enantioselective approach to 4-substituted proline scaffolds: Synthesis of (s)-5-(tert-butoxy carbonyl)-5-azaspiro[2.4]heptane-6-carboxylic acid

Ariza, Xavier,Bartra, Martí,Berenguer, Ramon,Gómez, Roberto,Garcia, Jordi,López, Blanca,Torralvo, Hèctor

, (2020)

A catalytic and enantioselective preparation of the (S)-4-methyleneproline scaffold is described. The key reaction is a one-pot double allylic alkylation of an imine analogue of glycine in the presence of a chinchonidine-derived catalyst under phase transfer conditions. These 4-methylene substituted proline derivatives are versatile starting materials often used in medicinal chemistry. In particular, we have transformed tert-butyl (S)-4-methyleneprolinate (12) into the N-Boc-protected 5-azaspiro[2.4]heptane-6-carboxylic acid (1), a key element in the industrial synthesis of antiviral ledipasvir.

Development of potent and selective Cathepsin C inhibitors free of aortic binding liability by application of a conformational restriction strategy

Banerjee, Abhisek,Behera, Dayanidhi B.,Chakraborti, Samitabh,Das, Sanjib,Gharat, Laxmikant A.,Iyer, Pravin S.,Kadam, Pradip,Karanjai, Keya,Patil, Sandip,Pawar, Mahesh,Qadri, Mohammad Mohsin,Saini, Jagmohan S.,Velagaleti, Ranganadh,Yadav, Pravin

, (2021/06/25)

Cathepsin C plays a key role in the activation of several degradative enzymes linked to tissue destruction in chronic inflammatory and autoimmune diseases. Therefore, Cathepsin C inhibitors could potentially be effective therapeutics for the treatment of diseases such as chronic obstructive pulmonary disease (COPD) or acute respiratory distress syndrome (ARDS). In our efforts towards the development of a novel series of Cathepsin C inhibitors, we started working around AZD5248 (1), an α-amino acid based scaffold having potential liability of aortic binding. A novel series of amidoacetonitrile based Cathepsin C inhibitors were developed by the application of a conformational restriction strategy on 1. In particular, this work led to the development of a potent and selective Cathepsin C inhibitor 3p, free of aortic binding liability.

MASP INHIBITORY COMPOUNDS AND USES THEREOF

-

, (2020/11/23)

The present invention relates to novel Mannose-binding lectin (MBL)-associated serine protease (MASP) inhibitory compounds, as well as analogues and derivatives thereof, to processes for the preparation thereof, to the use thereof alone or in combinations for treatment and/or prevention of diseases and to the use thereof for production of medicaments for treatment and/or prevention of diseases, especially for treatment and/or prevention of renal and cardiovascular disorders and of ischemia reperfusion injuries.

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