反应详情

A solution of tetra-n-butylammonium fluoride in tetrahydrofuran (1 M; 1.78 mL, 1.78 mmol) was added in two portions to a solution of N-[2-chloro-4-[[[[3-[[(1,1-dimethylethyl)dimethylsilyl]oxy]phenyl]methyl]amino]carbonyl]-6-methylbenzoyl]-3-[[(1,1-dimethylethoxy)carbonyl]amino]-L-alanine, methyl ester (1.03 g, 1.62 mmol) in dry tetrahydrofuran (20 mL). The solution was stirred at room temperature for 30 min, then diluted with ethyl acetate (100 mL) and washed with water (25 mL) and brine (25 mL). The solution was dried (MgSO4), filtered, evaporated, held under high vacuum for 2.5 h, and then chromatographed (60-70% ethyl acetate/petroleum ether) to give N-[2-chloro-4-[[[(3-hydroxyphenyl)methyl]amino]carbonyl]-6-methylbenzoyl]-3-[[(1,1-dimethylethoxy)carbonyl]amino]-L-alanine, methyl ester (0.82 g, 97%) as a white foam.

1. washwashed with water (25 mL) and brine (25 mL)
2. dry with materialThe solution was dried (MgSO4)
3. filtrationfiltered
4. customevaporated
5. waitheld under high vacuum for 2.5 h
6. customchromatographed (60-70% ethyl acetate/petroleum ether)