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1513-66-2 Usage

Chemical Properties

Pale yellow liquid

Check Digit Verification of cas no

The CAS Registry Mumber 1513-66-2 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,5,1 and 3 respectively; the second part has 2 digits, 6 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 1513-66:
(6*1)+(5*5)+(4*1)+(3*3)+(2*6)+(1*6)=62
62 % 10 = 2
So 1513-66-2 is a valid CAS Registry Number.
InChI:InChI=1/C5H3F2N/c6-4-2-1-3-8-5(4)7/h1-3H

1513-66-2 Well-known Company Product Price

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  • (Code)Product description
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  • TCI America

  • (D3892)  2,3-Difluoropyridine  >98.0%(GC)

  • 1513-66-2

  • 1g

  • 280.00CNY

  • Detail
  • TCI America

  • (D3892)  2,3-Difluoropyridine  >98.0%(GC)

  • 1513-66-2

  • 5g

  • 900.00CNY

  • Detail
  • Alfa Aesar

  • (H25771)  2,3-Difluoropyridine, 97%   

  • 1513-66-2

  • 250mg

  • 578.0CNY

  • Detail
  • Alfa Aesar

  • (H25771)  2,3-Difluoropyridine, 97%   

  • 1513-66-2

  • 1g

  • 1277.0CNY

  • Detail
  • Aldrich

  • (718173)  2,3-Difluoropyridine  95%

  • 1513-66-2

  • 718173-1G

  • 266.76CNY

  • Detail
  • Aldrich

  • (718173)  2,3-Difluoropyridine  95%

  • 1513-66-2

  • 718173-5G

  • 877.50CNY

  • Detail

1513-66-2SDS

SAFETY DATA SHEETS

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

Version: 1.0

Creation Date: Aug 10, 2017

Revision Date: Aug 10, 2017

1.Identification

1.1 GHS Product identifier

Product name 2,3-Difluoropyridine

1.2 Other means of identification

Product number -
Other names 2,3-Difluorpyridin

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:1513-66-2 SDS

1513-66-2Synthetic route

5-chloro-2,3-difluoropyridine
89402-43-7

5-chloro-2,3-difluoropyridine

2,3-difluoropyridine
1513-66-2

2,3-difluoropyridine

Conditions
ConditionsYield
With ammonium formate; acetic acid; palladium on activated charcoal at 25℃; for 6h;75%
palladium-carbon
palladium-carbon
pyridine
110-86-1

pyridine

A

perfluoro-N-ethylpyrrolidine
2344-10-7

perfluoro-N-ethylpyrrolidine

B

2,3-difluoropyridine
1513-66-2

2,3-difluoropyridine

C

Pentafluoropyridine
700-16-3

Pentafluoropyridine

D

N,N-Bis(trifluoromethyl)amine
371-77-7

N,N-Bis(trifluoromethyl)amine

Conditions
ConditionsYield
With caesium tetrafluorocobaltate(III) In gaseous matrix at 310℃; for 3.5h; Further byproducts given;A 35.3%
B 2.2%
C 13.6%
D 8.2%
pyridine
110-86-1

pyridine

A

2,3-difluoropyridine
1513-66-2

2,3-difluoropyridine

B

4H,5H-heptafluoro-2-azahex-2(Z),4(E)-diene
54471-09-9

4H,5H-heptafluoro-2-azahex-2(Z),4(E)-diene

C

5H-decafluoro-2-azahex-2(Z)-ene
54471-08-8

5H-decafluoro-2-azahex-2(Z)-ene

D

undecafluoro-2-azahex-2(Z)-ene
54471-05-5

undecafluoro-2-azahex-2(Z)-ene

Conditions
ConditionsYield
With potassium tetrafluorocobaltate In gaseous matrix at 215 - 225℃; 1.) 3.5-4 h; 2.) 2 h; Further byproducts given;
2-chloro-3-aminopyridine
6298-19-7

2-chloro-3-aminopyridine

2,3-difluoropyridine
1513-66-2

2,3-difluoropyridine

Conditions
ConditionsYield
Stage #1: 2-chloro-3-aminopyridine With hexafluorophosphoric acid; sodium nitrite In water at 0℃;
Stage #2: In xylene at 85℃; for 3h;
Stage #3: With sodium hydrogencarbonate; triethylamine In water; xylene
3-Fluoropyridine
372-47-4

3-Fluoropyridine

2,3-difluoropyridine
1513-66-2

2,3-difluoropyridine

Conditions
ConditionsYield
With silver(II) fluoride In acetonitrile at 20℃; for 1h; Mechanism;55 %Spectr.
2-chloro-3-fluoropyridine
17282-04-1

2-chloro-3-fluoropyridine

2,3-difluoropyridine
1513-66-2

2,3-difluoropyridine

Conditions
ConditionsYield
With tetramethylammonium fluoride In dimethyl sulfoxide at 80℃; for 24h; Inert atmosphere; Sealed tube;65 %Spectr.
2,3-difluoropyridine
1513-66-2

2,3-difluoropyridine

3-fluoro-2-hydrazinylpyridine
887266-57-1

3-fluoro-2-hydrazinylpyridine

Conditions
ConditionsYield
With hydrazine hydrate at 120℃; for 1h;93%
2,3-difluoropyridine
1513-66-2

2,3-difluoropyridine

ethyl (ethoxymethylene)cyanoacetate
94-05-3

ethyl (ethoxymethylene)cyanoacetate

ethyl 5-amino-1-(3-fluoropyridin-2-yl)-1H-pyrazole-4-carboxylate

ethyl 5-amino-1-(3-fluoropyridin-2-yl)-1H-pyrazole-4-carboxylate

Conditions
ConditionsYield
Stage #1: 2,3-difluoropyridine With hydrazine hydrate In ethanol for 3h; Reflux;
Stage #2: ethyl (ethoxymethylene)cyanoacetate In ethanol Reflux;
91%
2,3-difluoropyridine
1513-66-2

2,3-difluoropyridine

9H-carbazole
86-74-8

9H-carbazole

2,3-di(9H-carbazol-9-yl)pyridine

2,3-di(9H-carbazol-9-yl)pyridine

Conditions
ConditionsYield
With potassium carbonate In dimethyl sulfoxide at 150℃; for 12h; Inert atmosphere;90%
With potassium carbonate In dimethyl sulfoxide at 150℃; for 12h; Inert atmosphere;85%
2,3-difluoropyridine
1513-66-2

2,3-difluoropyridine

3,3'-difluoro-2H-[1,2'-bipyridin]-2-one

3,3'-difluoro-2H-[1,2'-bipyridin]-2-one

Conditions
ConditionsYield
With water; caesium carbonate In dimethyl sulfoxide at 110℃; for 12h;90%
With water; caesium carbonate In dimethyl sulfoxide at 110℃; for 12h;90%
2,3-difluoropyridine
1513-66-2

2,3-difluoropyridine

acetamidine hydrochloride
124-42-5

acetamidine hydrochloride

C7H7FN2O

C7H7FN2O

Conditions
ConditionsYield
With water; caesium carbonate In dimethyl sulfoxide at 90℃; for 18h; Schlenk technique; chemoselective reaction;89%
2,3-difluoropyridine
1513-66-2

2,3-difluoropyridine

tert-butyl (2S)-2-{[N-methoxy(N-methyl)amino]carbonyl}pyrrolidine-1-carboxylate
115186-37-3

tert-butyl (2S)-2-{[N-methoxy(N-methyl)amino]carbonyl}pyrrolidine-1-carboxylate

C15H18F2N2O3

C15H18F2N2O3

Conditions
ConditionsYield
Stage #1: 2,3-difluoropyridine With n-butyllithium In tetrahydrofuran at -78℃; for 1h; Inert atmosphere;
Stage #2: tert-butyl (2S)-2-{[N-methoxy(N-methyl)amino]carbonyl}pyrrolidine-1-carboxylate In tetrahydrofuran at -78℃; for 2h; Inert atmosphere;
85%
2,3-difluoropyridine
1513-66-2

2,3-difluoropyridine

4-chloro-2,3-difluoropyridine
851178-99-9

4-chloro-2,3-difluoropyridine

Conditions
ConditionsYield
Stage #1: 2,3-difluoropyridine With n-butyllithium In tetrahydrofuran; hexane
Stage #2: With 1,1,2-Trichloro-1,2,2-trifluoroethane In tetrahydrofuran; hexane
81%
2,3-difluoropyridine
1513-66-2

2,3-difluoropyridine

(E)-3-(pyridin-2-ylethynyl)cyclohex-2-enone oxime
1224432-92-1

(E)-3-(pyridin-2-ylethynyl)cyclohex-2-enone oxime

(E)-3-(pyridin-2-ylethynyl)cyclohex-2-enone O-3-fluoropyridin-2-yl oxime
1224433-00-4

(E)-3-(pyridin-2-ylethynyl)cyclohex-2-enone O-3-fluoropyridin-2-yl oxime

Conditions
ConditionsYield
Stage #1: (E)-3-(pyridin-2-ylethynyl)cyclohex-2-enone oxime With sodium hydride In N,N-dimethyl-formamide; mineral oil at 20℃; for 0.5h; Inert atmosphere;
Stage #2: 2,3-difluoropyridine In N,N-dimethyl-formamide; mineral oil at 20℃; for 1.5h; Inert atmosphere;
81%
2,3-difluoropyridine
1513-66-2

2,3-difluoropyridine

3-fluoropyridin-2-amine
21717-95-3

3-fluoropyridin-2-amine

Conditions
ConditionsYield
With acetamidine hydrochloride; sodium hydroxide In water; dimethyl sulfoxide at 130℃; for 24h; Schlenk technique; chemoselective reaction;81%
2,3-difluoropyridine
1513-66-2

2,3-difluoropyridine

4-benzyl-3-ethoxy-5-methyl-1H-pyrazole
1116655-96-9

4-benzyl-3-ethoxy-5-methyl-1H-pyrazole

2-(4-benzyl-3-ethoxy-5-methyl-1H-pyrazol-1-yl)-3-fluoropyridine

2-(4-benzyl-3-ethoxy-5-methyl-1H-pyrazol-1-yl)-3-fluoropyridine

Conditions
ConditionsYield
With caesium carbonate In acetonitrile at 180℃; for 2h; Microwave irradiation;74%
2,3-difluoropyridine
1513-66-2

2,3-difluoropyridine

cyclopropropanecarbonitrile
5500-21-0

cyclopropropanecarbonitrile

1-(3-fluoropyridin-2-yl)cyclopropane-1-carbonitrile

1-(3-fluoropyridin-2-yl)cyclopropane-1-carbonitrile

Conditions
ConditionsYield
Stage #1: cyclopropropanecarbonitrile With lithium hexamethyldisilazane In 2-methyltetrahydrofuran; hexane at 0℃; for 0.166667h;
Stage #2: 2,3-difluoropyridine In 2-methyltetrahydrofuran; hexane at 0 - 20℃; for 3h;
72%
2,3-difluoropyridine
1513-66-2

2,3-difluoropyridine

1,2-dicarba-closo-dodecaborane(12)
16872-09-6

1,2-dicarba-closo-dodecaborane(12)

C7H14B10FN

C7H14B10FN

Conditions
ConditionsYield
Stage #1: 1,2-dicarba-closo-dodecaborane(12) With n-butyllithium In tetrahydrofuran; hexane at 0℃; for 0.5h; Inert atmosphere; Schlenk technique;
Stage #2: 2,3-difluoropyridine In tetrahydrofuran; hexane at 70℃; for 3h; Inert atmosphere; Schlenk technique;
69%
2,3-difluoropyridine
1513-66-2

2,3-difluoropyridine

2,3-difluoro-4-iodopyridine
851386-34-0

2,3-difluoro-4-iodopyridine

Conditions
ConditionsYield
Stage #1: 2,3-difluoropyridine With lithium diisopropyl amide In tetrahydrofuran; hexane at -78℃; for 1h;
Stage #2: With iodine In tetrahydrofuran; hexane at -78℃; for 1h;
63%
With iodine; lithium diisopropyl amide In tetrahydrofuran at -78℃; regioselective reaction;
2,3-difluoropyridine
1513-66-2

2,3-difluoropyridine

1-(4-methyl-4-piperidyl)pyrazole-4-carbaldehyde

1-(4-methyl-4-piperidyl)pyrazole-4-carbaldehyde

1-[1-(3-fluoro-2-pyridyl)-4-methyl-4-piperidyl]pyrazole-4-carbaldehyde

1-[1-(3-fluoro-2-pyridyl)-4-methyl-4-piperidyl]pyrazole-4-carbaldehyde

Conditions
ConditionsYield
With N-ethyl-N,N-diisopropylamine In 1-methyl-pyrrolidin-2-one at 135℃; for 12h; Sealed tube;61.25%
2,3-difluoropyridine
1513-66-2

2,3-difluoropyridine

diethyl malonate
105-53-3

diethyl malonate

diethyl 2-(3-fluoropyridin-2-yl)malonate
940933-39-1

diethyl 2-(3-fluoropyridin-2-yl)malonate

Conditions
ConditionsYield
With caesium carbonate In dimethyl sulfoxide at 100℃; for 4.5h;60%
With caesium carbonate In dimethyl sulfoxide at 100℃; for 4.5h;60%
With caesium carbonate In dimethyl sulfoxide at 100℃; for 3h;
2,3-difluoropyridine
1513-66-2

2,3-difluoropyridine

C14H21N3O2

C14H21N3O2

C19H23FN4O2

C19H23FN4O2

Conditions
ConditionsYield
at 130℃; for 48h;52%
2,3-difluoropyridine
1513-66-2

2,3-difluoropyridine

3-amino-2-pyridone
33630-99-8

3-amino-2-pyridone

3-amino-3‘-fluoro-2H-[1,2’-bipyridin]-2-one

3-amino-3‘-fluoro-2H-[1,2’-bipyridin]-2-one

Conditions
ConditionsYield
With potassium phosphate In 1-methyl-pyrrolidin-2-one at 90 - 100℃; for 22h;49.37%
2,3-difluoropyridine
1513-66-2

2,3-difluoropyridine

3-methyl-1H-pyrazole-4-carbaldehyde
112758-40-4

3-methyl-1H-pyrazole-4-carbaldehyde

1-(3-fluoro-2-pyridyl)-3-methylpyrazole-4-carbaldehyde
1307248-77-6

1-(3-fluoro-2-pyridyl)-3-methylpyrazole-4-carbaldehyde

Conditions
ConditionsYield
Stage #1: 3-methyl-1H-pyrazole-4-carbaldehyde With potassium tert-butylate In N,N-dimethyl-formamide at 20℃; for 0.166667h;
Stage #2: 2,3-difluoropyridine In N,N-dimethyl-formamide at 20℃; for 20h;
43%
Stage #1: 3-methyl-1H-pyrazole-4-carbaldehyde With potassium tert-butylate In N,N-dimethyl-formamide at 20℃; for 0.166667h;
Stage #2: 2,3-difluoropyridine In N,N-dimethyl-formamide at 20℃; for 20h;
2,3-difluoropyridine
1513-66-2

2,3-difluoropyridine

4,6-dimethoxypyrimidin-2-ylacetonitrile
128276-52-8

4,6-dimethoxypyrimidin-2-ylacetonitrile

4,6-dimethoxy-2-(3-fluoro-2-pyridyl)formylpyrimidine

4,6-dimethoxy-2-(3-fluoro-2-pyridyl)formylpyrimidine

Conditions
ConditionsYield
Stage #1: 4,6-dimethoxypyrimidin-2-ylacetonitrile With sodium hydride In N,N-dimethyl acetamide at 0℃; for 0.5h;
Stage #2: 2,3-difluoropyridine In N,N-dimethyl acetamide at 20℃; for 8h;
Stage #3: With dihydrogen peroxide In N,N-dimethyl acetamide at 0 - 20℃;
42.7%
2,3-difluoropyridine
1513-66-2

2,3-difluoropyridine

ethyl 1-methyl-5-(4-methyl-1,2,5,6-tetrahydropyridin-3-yl)-1H-pyrazole-3-carboxylate

ethyl 1-methyl-5-(4-methyl-1,2,5,6-tetrahydropyridin-3-yl)-1H-pyrazole-3-carboxylate

C18H21FN4O2

C18H21FN4O2

Conditions
ConditionsYield
With N-ethyl-N,N-diisopropylamine In N,N-dimethyl-formamide at 100℃; for 24h;40%
2,3-difluoropyridine
1513-66-2

2,3-difluoropyridine

methyl 3-[(6-hydroxy-1-methyl-1H-benzimidazol-2-yl)methoxy]benzoate
1242328-95-5

methyl 3-[(6-hydroxy-1-methyl-1H-benzimidazol-2-yl)methoxy]benzoate

methyl 3-({6-[(3-fluoropyridin-2-yl)oxy]-1-methyl-1H-benzimidazol-2-yl}methoxy)benzoate

methyl 3-({6-[(3-fluoropyridin-2-yl)oxy]-1-methyl-1H-benzimidazol-2-yl}methoxy)benzoate

Conditions
ConditionsYield
With copper(l) iodide; 1,10-Phenanthroline; caesium carbonate In N,N-dimethyl-formamide at 80℃; for 2h; Inert atmosphere;28%
3-bromo-pyridin-2-ol
13466-43-8

3-bromo-pyridin-2-ol

2,3-difluoropyridine
1513-66-2

2,3-difluoropyridine

3-bromo-3‘-fluoro-2H-[1,2’-bipyridin]-2-one

3-bromo-3‘-fluoro-2H-[1,2’-bipyridin]-2-one

Conditions
ConditionsYield
With caesium carbonate In 1-methyl-pyrrolidin-2-one at 110℃; for 15h;21.47%
With caesium carbonate In 1-methyl-pyrrolidin-2-one at 110℃; for 15h;21%
2,3-difluoropyridine
1513-66-2

2,3-difluoropyridine

3-hydroxy-2,2-dimethyl-N-(1-methylpiperidin-4-yl)propanamide

3-hydroxy-2,2-dimethyl-N-(1-methylpiperidin-4-yl)propanamide

3-((3-fluoropyridin-2-yl)oxy)-2,2-dimethyl-N-(1-methylpiperidin-4-yl)propanamide

3-((3-fluoropyridin-2-yl)oxy)-2,2-dimethyl-N-(1-methylpiperidin-4-yl)propanamide

Conditions
ConditionsYield
Stage #1: 3-hydroxy-2,2-dimethyl-N-(1-methylpiperidin-4-yl)propanamide With sodium hydride In N,N-dimethyl-formamide at 20℃; for 0.5h;
Stage #2: 2,3-difluoropyridine In N,N-dimethyl-formamide at 20℃;
19%
2,3-difluoropyridine
1513-66-2

2,3-difluoropyridine

3-bromopyridin-2(1H)-one
13466-43-8

3-bromopyridin-2(1H)-one

3-bromo-3‘-fluoro-2H-[1,2’-bipyridin]-2-one

3-bromo-3‘-fluoro-2H-[1,2’-bipyridin]-2-one

Conditions
ConditionsYield
With caesium carbonate In 1-methyl-pyrrolidin-2-one at 110℃; for 15h;16.81%
With caesium carbonate In 1-methyl-pyrrolidin-2-one at 110℃; for 15h; Time;16.81%
2,3-difluoropyridine
1513-66-2

2,3-difluoropyridine

3,4-difluoropyridine

3,4-difluoropyridine

Conditions
ConditionsYield
Multi-step reaction with 6 steps
1.1: BuLi / tetrahydrofuran; hexane
1.2: 81 percent / 1,1,2-trichloro-1,2,2-trifluoroethane / tetrahydrofuran; hexane
2.1: 75 percent / KF; tetramethylammonium chloride / dimethylsulfoxide / 2 h / 150 °C
3.1: i-Pr2NH; BuLi / tetrahydrofuran; hexane / 2 h / -75 °C
3.2: 82 percent / tetrahydrofuran; hexane / 1 h / -75 °C
4.1: 96 percent / hydrazine monohydrate / tetrahydrofuran / 20 h / 50 °C
5.1: 72 percent / tetrabutylammonium fluoride trihydrate / tetrahydrofuran / 2 h / 25 °C
6.1: 60 percent / MnO2 / octan-1-ol / 15 - 25 °C
View Scheme
2,3-difluoropyridine
1513-66-2

2,3-difluoropyridine

3,4-difluoro-2-hydrazinopyridine
874907-81-0

3,4-difluoro-2-hydrazinopyridine

Conditions
ConditionsYield
Multi-step reaction with 5 steps
1.1: BuLi / tetrahydrofuran; hexane
1.2: 81 percent / 1,1,2-trichloro-1,2,2-trifluoroethane / tetrahydrofuran; hexane
2.1: 75 percent / KF; tetramethylammonium chloride / dimethylsulfoxide / 2 h / 150 °C
3.1: i-Pr2NH; BuLi / tetrahydrofuran; hexane / 2 h / -75 °C
3.2: 82 percent / tetrahydrofuran; hexane / 1 h / -75 °C
4.1: 96 percent / hydrazine monohydrate / tetrahydrofuran / 20 h / 50 °C
5.1: 72 percent / tetrabutylammonium fluoride trihydrate / tetrahydrofuran / 2 h / 25 °C
View Scheme

1513-66-2Relevant articles and documents

Tetramethylammonium Fluoride Alcohol Adducts for SNAr Fluorination

Bland, Douglas C.,Lee, So Jeong,Morales-Colón, Mariá T.,Sanford, Melanie S.,Scott, Peter J. H.,See, Yi Yang

supporting information, p. 4493 - 4498 (2021/06/28)

Nucleophilic aromatic fluorination (SNAr) is among the most common methods for the formation of C(sp2)-F bonds. Despite many recent advances, a long-standing limitation of these transformations is the requirement for rigorously dry, aprotic conditions to maintain the nucleophilicity of fluoride and suppress the generation of side products. This report addresses this challenge by leveraging tetramethylammonium fluoride alcohol adducts (Me4NF·ROH) as fluoride sources for SNAr fluorination. Through systematic tuning of the alcohol substituent (R), tetramethylammonium fluoride tert-amyl alcohol (Me4NF·t-AmylOH) was identified as an inexpensive, practical, and bench-stable reagent for SNAr fluorination under mild and convenient conditions (80 °C in DMSO, without the requirement for drying of reagents or solvent). A substrate scope of more than 50 (hetero) aryl halides and nitroarene electrophiles is demonstrated.

Selective C-H fluorination of pyridines and diazines inspired by a classic amination reaction

Fier, Patrick S.,Hartwig, John F.

, p. 956 - 960 (2013/12/04)

Fluorinated heterocycles are prevalent in pharmaceuticals, agrochemicals, and materials. However, reactions that incorporate fluorine into heteroarenes are limited in scope and can be hazardous. We present a broadly applicable and safe method for the site-selective fluorination of a single carbon-hydrogen bond in pyridines and diazines using commercially available silver(II) fluoride. The reactions occur at ambient temperature within 1 hour with exclusive selectivity for fluorination adjacent to nitrogen. The mild conditions allow access to fluorinated derivatives of medicinally important compounds, as well as a range of 2-substituted pyridines prepared by subsequent nucleophilic displacement of fluoride. Mechanistic studies demonstrate that the pathway of a classic pyridine amination can be adapted for selective fluorination of a broad range of nitrogen heterocycles.

NITROGENOUS FUSED?RING COMPOUND HAVING PYRAZOLYL GROUP AS SUBSTITUENT AND MEDICINAL COMPOSITION THEREOF

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Page 133, (2008/06/13)

The present invention provides a compound having an excellent inhibitory action on activation of STAT6 and a pharmaceutical composition thereof. Inparticular, it provides a compound represented by the following formula (I), a salt thereof or a hydrate of them. In the formula, X represents a nitrogen-containing condensed aromatic heterocyclic group such as imidazo[1,2-a]pyridine, benzimidazole, quinazoline, quinoline, or 2,1-benzisoxazole and has (R4)n as substituent groups; Y represents a C3-8 cycloalkyl group, C4-8 cycloalkenyl group, 5- to 14-membered non-aromatic heterocyclic group, C6-14 aromatic hydrocarbon cyclic group or 5- to 14-membered aromatic heterocyclic group; n in (R4)n is 0, 1, 2 or 3, and Z groups independently represent (1) hydrogen atom, (2) amino group, (3) halogen atom, (4) hydroxyl group, (5) nitro group, (6) cyano group, (7) azido group, (8) formyl group, (9) hydroxyamino group, (10) sulfamoyl group, (11) guanodino group, (12) oxo group, (13) C2-6 alkenyl group, (14) C1-6 alkoxy group, (15) C1-6 alkylhydroxyamino group, (16) halogenated C1-6 alkyl group, (17) halogenated C2-6 alkenyl group, (18) (i) C3-7cycloalkyl group, (ii) C3-7cycloalkenyl group, (iii) 5- to 14-membered non-aromatic heterocyclic group, each of which may have one or more substituent groups Q, or (19) formula -M1-M2-M3, R1 represents (1) hydrogen atom, (2) halogen atom, (3) hydroxyl group, (4) nitro group, (5) cyano group, (6) halogenated C1-6 alkyl group, (7) C2-6 alkyl group substituted with a hydroxyl or cyano group, (8) C2-6 alkenyl group, or (9) formula -L1-L2-L3, and R2 represents a hydrogen atom or a protecting group; and R3 represents a hydrogen atom, halogen atom, cyano group, amino group, C1-4 alkyl group or halogenated C1-4 alkyl group.

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