o-Chlorophenylacetic acid → Ethyl 5-(2-chlorobenzyl)-1,2,4-oxadiazole-3-carboxylate

HRID 58600

반응식

HRID 58600 반응식
[Cl:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[CH2:8][C:9]([OH:11])=O.C(Cl)(=O)C(Cl)=O.[NH2:18][C:19](=[N:25]O)[C:20]([O:22][CH2:23][CH3:24])=[O:21].C(N(CC)C(C)C)(C)C>ClCCl.N1C=CC=CC=1.CN(C=O)C>[Cl:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[CH2:8][C:9]1[O:11][N:25]=[C:19]([C:20]([O:22][CH2:23][CH3:24])=[O:21])[N:18]=1

참가 물질

8

반응물 4

HCID 17124o-Chlorophenylacetic acidHCID 65578Oxalyl chlorideHCID 81531DiisopropylethylamineHCID 6785548Ethyl 2-amino-2-(hydroxyimino)acetate

생성물 1

HCID 63379723Ethyl 5-(2-chlorobenzyl)-1,2,4-oxadiazole-3-carboxylate수율 38.4%

시약·촉매·용매 3

HCID 1049Pyridine용매HCID 6228Dimethylformamide용매HCID 6344Dichloromethane용매2회

실험 절차

This compound was prepared according to general method 2 with (step I) 2-(2-chlorophenyl)acetic acid (0.646 g; 3.78 mmol) and oxalyl chloride (0.352 mL; 4.16 mmol) in dichloromethane (12 mL) with few drops of DMF and (step II) ethyl 2-amino-2-(hydroxyimino)acetate (0.5 g; 3.78 mmol) and N,N diisopropylethylamine (1.05 mL; 6.06 mmol) in dichloromethane (6 mL) and (step III) pyridine (18 mL). The crude material was purified by flash chromatography on silica (eluent 20 to 100% ethyl acetate in heptane) to yield 0.387 g (38%) of ethyl 5-(2-chlorobenzyl)-1,2,4-oxadiazole-3-carboxylate as a white solid.

후처리

  1. customThis compound was prepared
  2. customThe crude material was purified by flash chromatography on silica (eluent 20 to 100% ethyl acetate in heptane)

출처 및 근거

ORD 기록
ord-d224cb5a88ec453f865a2f1872d841c9
출처 데이터셋
uspto-grants-2016_09
특허 번호
US09434722B2

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