Metoclopramide → 4-Amino-5-chloro-N-[2-(dimethylamino)ethyl]-2-hydroxybenzamide
Reaction equation
[NH2:1][C:2]1[C:17]([Cl:18])=[CH:16][C:5]([C:6]([NH:8][CH2:9][CH2:10][N:11]([CH2:14]C)[CH2:12]C)=[O:7])=[C:4]([O:19]C)[CH:3]=1.NC1C(Cl)=CC(C(NCCN(C)C)=O)=C(OC)C=1>>[NH2:1][C:2]1[C:17]([Cl:18])=[CH:16][C:5]([C:6]([NH:8][CH2:9][CH2:10][N:11]([CH3:14])[CH3:12])=[O:7])=[C:4]([OH:19])[CH:3]=1Participants
3
Procedure
The general procedure of Preparation 1A was repeated except that the 4-amino-5-chloro-N-[2-(diethylamino)ethyl]-2-methoxybenzamide utilized therein was replaced by 4-amino-5-chloro-N-[2-(dimethylamino)ethyl]-2-methoxybenzamide (prepared according to U.K. Pat. No. 1,793,771). The solvent (DMF) was removed in vacuo, and the residue treated with water and methylene chloride saturated with carbon dioxide, concentrated, and the crude product isolated in 89% yield by extraction with ethanol. A sample was chromatographed on a silica gel column usimg methylene chloride (97), methanol (3), ammonia (0.3) solvent system. The appropriate fractions were combined and concentrated in vacuo. The residue was crystallized from methanol to give the title compound as a colorless solid, mp. 163°-165°.