反应详情

A solution of tert-butyl (2S,3R)-4-(4-cyanobenzylamino)-1-cyclohexyl-3-hydroxybutan-2-ylcarbamate (600 mg, 1.5 mmol) in CH2Cl2 (30 mL) was treated with Teoc-OSu (762 mg, 3.0 mmol, 2.0 equiv) and Et3N (304 mg, 3.0 mmol, 2.0 equiv). The mixture was allowed to stir overnight at rt. LC-MS analysis showed that all of the free amine had been consumed. The solution was washed with water, 1.0 M aq HCl, and brine, then over dried over Na2SO4, filtered and evaporated to leave tert-butyl (2S,3R)-4-(N-(4-cyanobenzyl)-N-(2-(trimethylsilyl)ethoxycarbonyl)amino)-1-cyclohexyl-3-hydroxybutan-2-ylcarbamate. NMR analysis showed that the compound was of sufficient purity to use in the next step.

1. customhad been consumed
2. washThe solution was washed with water, 1.0 M aq HCl, and brine
3. dry with materialover dried over Na2SO4
4. filtrationfiltered
5. customevaporated