反应详情

A mixture of 4-amino-2-(2-butanon-3-yl)oxy-5-chloro-N-[2-(diethylamino)ethyl]benzamide (obtained by treating 1.2 g, 3.1 mmoles, of the corresponding hydrochloride salt, prepared in Example 7C, with saturated sodium carbonate solution) and sodium borohydride (100 mg) in ethanol (20 ml) was heated under reflux for one hour. The solution was concentrated, diluted with water, acidified with 2N hydrochloric acid, and basified with saturated sodium carbonate solution. The mixture was extracted with methylene chloride to yield 1.16 g of foam. This material was chromatographed over deactivated silica using methylene chloride (100), methanol (2), ammonia (0.5) as the solvent system. The appropriate fractions were combined to yield the title compound (470 mg) as a foamy mixture of diastereoisomers. The NMR spectrum (90 MHz) in CDCl3 gave the following resonances: δ 8.54 (bd, 1H); 8.2, 8.15 (2s, 1H); 6.32, 6.35 (2s, 1H); 4.36 (s, 2H); 4.24-4 (m, 1H); 4-2.12 (m, 3H); 2.8-2.52 (m, 6H); 1.41-0.96 (m, 12H).

1. customobtained
2. additionby treating 1.2 g, 3.1 mmoles
3. temperaturewas heated
4. temperatureunder reflux for one hour
5. concentrationThe solution was concentrated
6. additiondiluted with water
7. extractionThe mixture was extracted with methylene chloride