Hydrochloric Acid → 3,4-Dichloro-5-methyl-1H-pyrrole-2-carboxylic acid

HRID 1948294노트

반응식

HRID 1948294 반응식
[Cl:1][C:2]1[C:6]([Cl:7])=[C:5]([CH3:8])[NH:4][C:3]=1[C:9]([O:11]CC)=[O:10].C(Cl)Cl.[Li+].[OH-].Cl>CO>[Cl:1][C:2]1[C:6]([Cl:7])=[C:5]([CH3:8])[NH:4][C:3]=1[C:9]([OH:11])=[O:10]

참가 물질

6

반응물 4

HCID 313Hydrochloric AcidHCID 3939Lithium HydroxideHCID 6344DichloromethaneHCID 68519325Ethyl 3,4-dichloro-5-methyl-1H-pyrrole-2-carboxylate2회

생성물 1

HCID 251376823,4-Dichloro-5-methyl-1H-pyrrole-2-carboxylic acid수율 64%

시약·촉매·용매 1

HCID 887Methanol용매

실험 절차

Ethyl 3,4-dichloro-5-methyl-1H-pyrrole-2-carboxylate (Intermediate 2; 7.765 g, 0.03496 mol) was dissolved in MeOH (80 ml) and DCM (10 ml) and slowly added to a 70° C. solution of 2 N LiOH (105 ml, 0.21 mol). After 2 h, the reaction mixture was cooled to room temperature and then in an ice bath, followed by acidification with 2 N HCl. The mixture was stirred at 0° C. for 1 h, and a purple solid was filtered, washed with water and lyophilized overnight to give 4.314 g (0.0222 mol, 64% yield) of the desired product. MS (ES−): 192.13, 194.13 for C6H5Cl2NO2; NMR: 2.17 (s, 3H).

후처리

  1. filtrationa purple solid was filtered
  2. washwashed with water
  3. waitlyophilized overnight

출처 및 근거

ORD 기록
ord-6e2a9e2f9756403993a9a381ce4dd958
출처 데이터셋
uspto-grants-2013_03
특허 번호
US08399489B2

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