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141109-14-0 Usage

Uses

(S)-(+)-2-Chlorophenylglycine methyl ester tartrate

Check Digit Verification of cas no

The CAS Registry Mumber 141109-14-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,1,1,0 and 9 respectively; the second part has 2 digits, 1 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 141109-14:
(8*1)+(7*4)+(6*1)+(5*1)+(4*0)+(3*9)+(2*1)+(1*4)=80
80 % 10 = 0
So 141109-14-0 is a valid CAS Registry Number.
InChI:InChI=1/C9H10ClNO2.ClH/c1-13-9(12)6-11-8-5-3-2-4-7(8)10;/h2-5,11H,6H2,1H3;1H

141109-14-0SDS

SAFETY DATA SHEETS

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

Version: 1.0

Creation Date: Aug 14, 2017

Revision Date: Aug 14, 2017

1.Identification

1.1 GHS Product identifier

Product name (S)-Methyl 2-amino-2-(2-chlorophenyl)acetate

1.2 Other means of identification

Product number -
Other names (S)-(+)-2-Chlorophenylglycine methyl ester

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:141109-14-0 SDS

141109-14-0Synthetic route

2-chlorophenylglycine methyl ester L-(+)-tartaric acid
141109-15-1

2-chlorophenylglycine methyl ester L-(+)-tartaric acid

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate
141109-14-0

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate

Conditions
ConditionsYield
In methanol for 0.5h; Reflux;95%
With ammonia In dichloromethane; water at 40℃; pH=6.9 - 7.2;70%
With ammonia In dichloromethane; water for 0.5h; pH=7.0 - 7.2;
With sodium hydroxide In water; toluene at 0 - 10℃; pH=9;
methanol
67-56-1

methanol

(S)-2-(2-chlorophenyl)glycinamide hydrochloride
1198213-98-7

(S)-2-(2-chlorophenyl)glycinamide hydrochloride

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate
141109-14-0

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate

Conditions
ConditionsYield
Stage #1: methanol With sulfuric acid Cooling with ice; Reflux;
Stage #2: (S)-2-(2-chlorophenyl)glycinamide hydrochloride at 20℃; Reflux;
Stage #3: With sodium hydroxide In water
94%
methanol
67-56-1

methanol

(2S)-2-(2-chlorophenyl)glycine hydrochloride
225918-58-1

(2S)-2-(2-chlorophenyl)glycine hydrochloride

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate
141109-14-0

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate

Conditions
ConditionsYield
With sulfuric acid at 0℃; for 5h; Reflux;85%
L-(+)-tartaric acid salt of α-amino-(2-chlorophenyl)acetic acid methyl ester

L-(+)-tartaric acid salt of α-amino-(2-chlorophenyl)acetic acid methyl ester

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate
141109-14-0

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate

Conditions
ConditionsYield
With sodium hydrogencarbonate In dichloromethane; water at 5℃; for 1.66667h; pH=7.46;
(S)-methyl 2-((tert-butoxycarbonyl)amino)-2-(2-chlorophenyl)acetate
1176305-58-0

(S)-methyl 2-((tert-butoxycarbonyl)amino)-2-(2-chlorophenyl)acetate

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate
141109-14-0

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate

Conditions
ConditionsYield
Stage #1: (S)-methyl 2-((tert-butoxycarbonyl)amino)-2-(2-chlorophenyl)acetate With trifluoroacetic acid In dichloromethane at 20℃; for 3h;
Stage #2: With ammonium hydroxide In water pH=7;
0.315 g
methyl 2-((tert-butoxycarbonyl)amino)-2-(2-chlorophenyl)acetate
1253091-76-7

methyl 2-((tert-butoxycarbonyl)amino)-2-(2-chlorophenyl)acetate

A

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate
141109-14-0

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate

B

α-amino-(2-chlorophenyl)acetic acid methyl ester
141109-16-2

α-amino-(2-chlorophenyl)acetic acid methyl ester

Conditions
ConditionsYield
With protease from Bacillus licheniformis for 12h; pH=7.5; aq. buffer; Resolution of racemate; optical yield given as %ee;
2-chloro-benzaldehyde
89-98-5

2-chloro-benzaldehyde

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate
141109-14-0

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate

Conditions
ConditionsYield
Multi-step reaction with 3 steps
1: methanol; water / 16 h / 25 - 30 °C
2: water; hydrogenchloride / diethyl ether / 4 h / 90 °C
3: sulfuric acid / 5 h / 0 °C / Reflux
View Scheme
(2S)-(2-chlorophenyl){[(1S)-1-(4-methoxyphenyl)ethyl]amino}acetonitrile hydrochloride
1430061-09-8

(2S)-(2-chlorophenyl){[(1S)-1-(4-methoxyphenyl)ethyl]amino}acetonitrile hydrochloride

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate
141109-14-0

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate

Conditions
ConditionsYield
Multi-step reaction with 2 steps
1: water; hydrogenchloride / diethyl ether / 4 h / 90 °C
2: sulfuric acid / 5 h / 0 °C / Reflux
View Scheme
2-(2-chlorophenyl)glycine methyl ester hydrochloride
141109-14-0, 141109-16-2, 141109-13-9

2-(2-chlorophenyl)glycine methyl ester hydrochloride

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate
141109-14-0

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate

Conditions
ConditionsYield
Multi-step reaction with 2 steps
1: methanol; acetonitrile; butanone / 11.5 h / Reflux
2: methanol / 0.5 h / Reflux
View Scheme
Multi-step reaction with 2 steps
1: sulfuric acid / methanol; acetone / 20 h / 10 - 30 °C
2: ammonia / water; dichloromethane / 40 °C / pH 6.9 - 7.2
View Scheme
2-amino-(2-chlorophenyl)ethanoic acid
86169-24-6, 141196-64-7, 141315-50-6, 88744-36-9

2-amino-(2-chlorophenyl)ethanoic acid

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate
141109-14-0

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate

Conditions
ConditionsYield
Multi-step reaction with 3 steps
1: thionyl chloride / -10 - 35 °C
2: methanol; acetonitrile; butanone / 11.5 h / Reflux
3: methanol / 0.5 h / Reflux
View Scheme
Multi-step reaction with 3 steps
1: sulfuric acid / 21 h / 35 - 65 °C
2: sulfuric acid / methanol; acetone / 20 h / 10 - 30 °C
3: ammonia / water; dichloromethane / 40 °C / pH 6.9 - 7.2
View Scheme
methanol
67-56-1

methanol

(S)-2-amino-(2-chlorophenyl)ethanoic acid
141315-50-6

(S)-2-amino-(2-chlorophenyl)ethanoic acid

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate
141109-14-0

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate

Conditions
ConditionsYield
With thionyl chloride In methanol at 20℃; under 760.051 Torr; for 24h; Reflux;5 g
(+)-2-chlorophenylglycine methyl ester tartrate

(+)-2-chlorophenylglycine methyl ester tartrate

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate
141109-14-0

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate

Conditions
ConditionsYield
With sodium carbonate In dichloromethane; water
methanol
67-56-1

methanol

C20H16ClN2OP

C20H16ClN2OP

A

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate
141109-14-0

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate

B

α-amino-(2-chlorophenyl)acetic acid methyl ester
141109-16-2

α-amino-(2-chlorophenyl)acetic acid methyl ester

Conditions
ConditionsYield
Stage #1: methanol; C20H16ClN2OP With hydrogenchloride at 80℃; for 15h;
Stage #2: With sodium carbonate In water Overall yield = 54 percent; enantioselective reaction;
A n/a
B n/a
methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate
141109-14-0

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate

1,1,1,3,3,3-hexamethyl-disilazane
999-97-3

1,1,1,3,3,3-hexamethyl-disilazane

C12H18ClNO2Si

C12H18ClNO2Si

Conditions
ConditionsYield
In 1,2-dichloro-ethane at 60 - 80℃;100%
2-thienylacetaldehyde
15022-15-8

2-thienylacetaldehyde

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate
141109-14-0

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate

C15H14ClNO2S

C15H14ClNO2S

Conditions
ConditionsYield
With ammonium acetate In toluene at 40℃; Solvent; Temperature; Reagent/catalyst;93.5%
2-(2-thienyl)ethyl tosylate
40412-06-4

2-(2-thienyl)ethyl tosylate

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate
141109-14-0

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate

(S)-(+)-α-(2-thienylethylamino)-α-(2-chlorophenyl)acetic acid methyl ester hydrochloride

(S)-(+)-α-(2-thienylethylamino)-α-(2-chlorophenyl)acetic acid methyl ester hydrochloride

Conditions
ConditionsYield
Stage #1: 2-(2-thienyl)ethyl tosylate; methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate With sodium hydrogencarbonate; potassium iodide In acetonitrile at 85℃; for 27h;
Stage #2: With hydrogenchloride In water at 20℃; for 2h;
91%
Stage #1: 2-(2-thienyl)ethyl tosylate; methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate With potassium dihydrogen phosphate trihydrate In water at 45 - 100℃; for 15h;
Stage #2: With hydrogenchloride at 0 - 3℃; for 1h; pH=1.2 - 1.5;
89%
Stage #1: 2-(2-thienyl)ethyl tosylate; methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate With dipotassium hydrogenphosphate In acetic acid tert-butyl ester at 92.5℃; for 30h;
Stage #2: With hydrogenchloride In water; ethyl acetate at 12.5℃; for 0.416667h; Product distribution / selectivity;
66.3%
methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate
141109-14-0

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate

(S)-methyl 2-amino-2-(2-chlorophenyl)acetate hydrochloride salt
213018-92-9

(S)-methyl 2-amino-2-(2-chlorophenyl)acetate hydrochloride salt

Conditions
ConditionsYield
With hydrogenchloride at 0 - 5℃;88.9%
methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate
141109-14-0

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate

C9H8ClN3O2

C9H8ClN3O2

Conditions
ConditionsYield
With fluorosulfonyl azide; potassium hydrogencarbonate In tert-butyl methyl ether; water; N,N-dimethyl-formamide at 20℃; for 0.0833333h;83%
methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate
141109-14-0

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate

3-(2'-iodoethyl) thiophene
114896-65-0

3-(2'-iodoethyl) thiophene

methyl (S)-(+)-2-(2-(thiophen-3-yl)ethylamino)-2-(2-chlorophenyl)acetate
1314028-89-1

methyl (S)-(+)-2-(2-(thiophen-3-yl)ethylamino)-2-(2-chlorophenyl)acetate

Conditions
ConditionsYield
With triethylamine In acetonitrile Reflux;80.68%
2-(3-hydroxymethylthiophen-2-yl)ethanol
865187-81-1

2-(3-hydroxymethylthiophen-2-yl)ethanol

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate
141109-14-0

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate

(S)-(+)-clopidogrel
113665-84-2

(S)-(+)-clopidogrel

Conditions
ConditionsYield
With bis[dichloro(pentamethylcyclopentadienyl)iridium(III)]; Bis(p-nitrophenyl) phosphate In toluene at 100℃; for 36h; Solvent; Time; Temperature; Sealed tube; Molecular sieve; Green chemistry;80%
2-(2-thienyl)ethyl tosylate
40412-06-4

2-(2-thienyl)ethyl tosylate

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate
141109-14-0

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate

methyl (S)-2-(2-chlorophenyl)-2-[2-(thien-2-yl)ethylamino]acetate
141109-20-8

methyl (S)-2-(2-chlorophenyl)-2-[2-(thien-2-yl)ethylamino]acetate

Conditions
ConditionsYield
With sodium hydrogencarbonate; potassium iodide In acetonitrile for 12h; Reflux;70%
With triethylamine at 78 - 82℃; for 8 - 10h; Product distribution / selectivity;
methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate
141109-14-0

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate

5-(2-methylbenzothiazol-5-yloxymethyl)isoxazole-3-carboxylic acid
1193342-88-9

5-(2-methylbenzothiazol-5-yloxymethyl)isoxazole-3-carboxylic acid

(2-chlorophenyl){[5-(2-methylbenzothiazol-5-yloxymethyl)isoxazole-3-carbonyl]-(S)-amino}acetic acid methyl ester
1193343-40-6

(2-chlorophenyl){[5-(2-methylbenzothiazol-5-yloxymethyl)isoxazole-3-carbonyl]-(S)-amino}acetic acid methyl ester

Conditions
ConditionsYield
Stage #1: 5-(2-methylbenzothiazol-5-yloxymethyl)isoxazole-3-carboxylic acid With dmap; benzotriazol-1-ol In N,N-dimethyl-formamide at 20℃; for 0.5h; Molecular sieve;
Stage #2: methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate With 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride In N,N-dimethyl-formamide
59.4%
methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate
141109-14-0

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate

3,4,5-tribenzyloxybenzoic acid
1486-48-2

3,4,5-tribenzyloxybenzoic acid

methyl 2-(2-chlorophenyl)-2-(3,4,5-tris(benzyloxy)benzamido)acetate

methyl 2-(2-chlorophenyl)-2-(3,4,5-tris(benzyloxy)benzamido)acetate

Conditions
ConditionsYield
With benzotriazol-1-ol; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; triethylamine In N,N-dimethyl-formamide8%
2-(2-bromoethyl)-3-(bromomethyl)thiophene
865187-82-2

2-(2-bromoethyl)-3-(bromomethyl)thiophene

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate
141109-14-0

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate

(S)-(+)-clopidogrel
113665-84-2

(S)-(+)-clopidogrel

Conditions
ConditionsYield
With N-ethyl-N,N-diisopropylamine In acetonitrile Reflux;
Stage #1: 2-(2-bromoethyl)-3-(bromomethyl)thiophene; methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate In ethyl acetate; acetonitrile at 25 - 30℃; for 0.25h;
Stage #2: With N-ethyl-N,N-diisopropylamine In ethyl acetate; acetonitrile Reflux;
methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate
141109-14-0

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate

4-nitrobenzaldehdye
555-16-8

4-nitrobenzaldehdye

C16H13ClN2O4

C16H13ClN2O4

Conditions
ConditionsYield
With (R)-3,3'-bis(9-anthracenyl)-1,1'-binaphthyl-2,2'-diyl hydrogenphosphate In toluene at 25℃; for 1h; Molecular sieve;
methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate
141109-14-0

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate

(S)-(+)-clopidogrel bisulfate
120202-66-6

(S)-(+)-clopidogrel bisulfate

Conditions
ConditionsYield
Multi-step reaction with 3 steps
1.1: sodium hydrogencarbonate / toluene / 25 - 30 °C
1.2: 85 - 90 °C
2.1: water / 25 - 35 °C
2.2: pH 7 - 8
3.1: sulfuric acid / acetone; methanol / 0 - 30 °C
View Scheme
Multi-step reaction with 3 steps
1.1: sodium hydrogencarbonate; potassium iodide / acetonitrile / 27 h / 85 °C
1.2: 2 h / 20 °C
2.1: 4 h / 40 °C / Darkness
3.1: sulfuric acid / methanol / 25 °C
View Scheme
Multi-step reaction with 3 steps
1.1: ammonium acetate / toluene / 40 °C
2.1: sodium tetrahydroborate / tetrahydrofuran / 25 °C
3.1: sulfuric acid / chloroform / 20 °C
3.2: 2 h / 10 °C
View Scheme
Multi-step reaction with 4 steps
1: 1,2-dichloro-ethane / 60 - 80 °C
2: potassium carbonate / acetonitrile / 70 - 80 °C
3: hydrogenchloride / water
4: water / 36 - 44 °C
View Scheme
methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate
141109-14-0

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate

(S)-(+)-clopidogrel
113665-84-2

(S)-(+)-clopidogrel

Conditions
ConditionsYield
Multi-step reaction with 2 steps
1.1: sodium hydrogencarbonate / toluene / 25 - 30 °C
1.2: 85 - 90 °C
2.1: water / 25 - 35 °C
2.2: pH 7 - 8
View Scheme
Multi-step reaction with 2 steps
1.1: sodium hydrogencarbonate; potassium iodide / acetonitrile / 27 h / 85 °C
1.2: 2 h / 20 °C
2.1: 4 h / 40 °C / Darkness
View Scheme
Multi-step reaction with 2 steps
1.1: potassium dihydrogen phosphate trihydrate / water / 15 h / 45 - 100 °C
1.2: 1 h / 0 - 3 °C / pH 1.2 - 1.5
2.1: methanol / 37 - 39 °C
View Scheme
methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate
141109-14-0

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate

methyl (S)-(+)-2-(2-chlorophenyl)-2-(4,5-dihydrothieno[2,3-c]pyridin-6(7H)-yl)acetate
1396841-05-6

methyl (S)-(+)-2-(2-chlorophenyl)-2-(4,5-dihydrothieno[2,3-c]pyridin-6(7H)-yl)acetate

Conditions
ConditionsYield
Multi-step reaction with 2 steps
1: triethylamine / acetonitrile / Reflux
2: hydrogenchloride / water / 25 - 55 °C
View Scheme
methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate
141109-14-0

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate

methyl (S)-(+)-2-(2-chlorophenyl)-2-(4,5-dihydrothieno[2,3-c]pyridine-6(7H)-yl)acetate hydrochloride
1396607-35-4

methyl (S)-(+)-2-(2-chlorophenyl)-2-(4,5-dihydrothieno[2,3-c]pyridine-6(7H)-yl)acetate hydrochloride

Conditions
ConditionsYield
Multi-step reaction with 3 steps
1: triethylamine / acetonitrile / Reflux
2: hydrogenchloride / water / 25 - 55 °C
3: hydrogenchloride / water; acetone / 25 °C
View Scheme
methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate
141109-14-0

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate

1,1,2,2-tetradeutero-2-(thiophen-2-yl)ethyl 4-methylbenzenesulfonate
1422395-32-1

1,1,2,2-tetradeutero-2-(thiophen-2-yl)ethyl 4-methylbenzenesulfonate

(S)-methyl 2-(2-chlorophenyl)-2-(1,1,2,2-tetradeutero-2-(thiophen-2-yl)ethylamino)acetate
1422495-71-3

(S)-methyl 2-(2-chlorophenyl)-2-(1,1,2,2-tetradeutero-2-(thiophen-2-yl)ethylamino)acetate

Conditions
ConditionsYield
With potassium hydrogencarbonate In acetonitrile at 80℃; for 24h; Sealed tube;
methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate
141109-14-0

methyl (S)-(+)-2-amino-2-(2-chlorophenyl)acetate

(S)-2-amino-2-(2-chlorophenyl) acetamide
1198220-10-8

(S)-2-amino-2-(2-chlorophenyl) acetamide

Conditions
ConditionsYield
With ammonium hydroxide In methanol; water at 20℃; under 760.051 Torr; for 72h; Inert atmosphere;3 g

141109-14-0Relevant articles and documents

Preparation method of clopidogrel hydrogen sulfate intermediate

-

Paragraph 0032, (2021/05/15)

The present invention relates to a preparation method of a clopidogrel hydrogen sulfate intermediate. (+)-2-chlorophenylglycine methyl ester and alpha-thiopheneethanol p-toluenesulfonate are adopted as raw materials, a reaction solvent and an acid-binding agent are added for a condensation reaction, the condensation reaction process is divided into a first stage and a second stage, and when 60-95% of the condensation reaction is completed, first-stage reaction is completed; after the first-stage reaction is completed, firstly part of the reaction solvent is removed, and then second-stage reaction is carried out; and after the second-stage reaction is completed, a target product is obtained, namely the clopidogrel hydrogen sulfate intermediate. After the first-stage reaction is completed, part of the reaction solvent is removed firstly, and then the second-stage reaction is continued, so that the concentration of the reaction material can be increased in the later stage of the condensation reaction, the use amount of the reaction solvent is reduced, and racemization and side reaction in the reaction process are effectively inhibited, thereby improving the chiral purity of the product, increasing the yield, reducing the use of auxiliary materials greatly, and reducing the production cost.

Preparation method of sulfonic clopidogrel impurity

-

Paragraph 0012; 0027-0029, (2020/08/02)

The invention discloses a preparation method of a sulfonic clopidogrel impurity. The preparation method comprises the following steps: reacting thiophene-2-ethanol with toluenesulfonyl chloride to generate p-toluenesulfonic acid-2-thienylethyl ester; carrying out esterification on o-chlorophenylglycine and methanol to generate o-chlorophenylglycine methyl ester; resolving the o-chlorophenylglycinemethyl ester by using L(+) tartaric acid; converting into free S-(+)-o-chlorophenylglycine methyl ester in dichloromethane; carrying out a condensation reaction on the p-toluenesulfonic acid-2-thienylethyl ester and the S-(+)-o-chlorophenylglycine methyl ester under an alkaline condition; acidifying the obtained product to generate (S)-2-(2-thienylethylamino)(2-chlorphenyl)methyl acetate, carrying out a condensation reaction on the (S)-2-(2-thienylethylamino)(2-chlorphenyl)methyl acetate and formaldehyde to obtain clopidogrel, and carrying out a reaction on the clopidogrel and chlorosulfonicacid to generate sulfonic clopidogrel impurity. The preparation method of the sulfonic clopidogrel impurity has the advantages of mild reaction conditions, accessible raw materials, low cost and highyield and purity.

Synthesis process of anti-cancer drug (glycinate methyl ester)

-

Paragraph 0010-0011, (2019/10/10)

The invention provides a synthesis process of an anti-cancer drug (glycinate methyl ester). The process includes the steps of firstly, adding methyl alcohol into a flask with a stirrer, a thermometer and a constant-pressure dropping funnel, controlling the temperature at 0-5 DEG C, and slowly dropwise adding acetyl chloride into the flask for thermal insulation reaction for 1.5 hours; secondly, adding o-chlorophenylglycine to be heated to 45 DEG C for reaction for 15 hours; thirdly, conducting depressurized rotary evaporating to remove most of solvent, and conducting separation and suction-filtration to obtain a product (hydrochloride solid); fourthly, dissolving the obtained solid in water, adding dichloromethane, adjusting the pH value to be 7.5 through ammonium hydroxide, extracting a water layer through dichloromethane, combining an organic layer, conducting washing through saturated table salt until the neutral state is reached, conducting drying and suction filtration on anhydrous magnesium sulfate, and conducting depressurized rotary evaporating to remove a solvent to obtain a colorless transparent oily substance. Through the improvement, the synthesis method has the advantages that the process is green and free of pollution, the reaction conditions are mild, the operation is simple, the product can be easily extracted, and the yield is high; thus, the problems and defects in the background are effectively solved and overcome.

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