反应详情

2.62 g (3.75 mmol) Cholest-5-en-3-yl 2-(4-nitrobenzyl)-3-(4-nitrophenyl)-propanoate and 0.79 g (14.77 mmol) ammonium chloride were suspended in 90 ml of a mixture consisting of methanol:water 9:1. 4.90 g (74.96 mmol) zinc powder was then added in 10 minutes. The reaction mixture was then allowed to react at 45° C. for 6 hours and partitioned between dichloromethane and water; the organic phase was washed repeatedly with water, dried over sodium sulfate, filtered and concentrated by rotary evaporation. First chromatography of the residue on 50 g silica gel using toluene:ethyl acetate 1:1 as eluant and second chromatography on 50 g silica gel using tert.butyl methylether as eluant yielded 1.66 g Cholest-5-en-3-yl 2-(4-aminobenzyl)-3-(4-aminophenyl)-propanoate as white powder.

1. customto react at 45° C. for 6 hours
2. custompartitioned between dichloromethane and water
3. washthe organic phase was washed repeatedly with water
4. dry with materialdried over sodium sulfate
5. filtrationfiltered
6. concentrationconcentrated by rotary evaporation