反应详情

温度

0 °C

Captopril (2.48 g, 0.0114 Mol) and N,N-diisopropyl ethylamine (4.50 ml, 0.0258 Mol) were dissolved in dioxane/H2O (30 ml, 1:1). The mixture was cooled to 0° C. and 1-chloromethyl chloroformate (1.20 ml, 0.0147 Mol) was added. The reaction was stirred at 0° C. for 4 h, then partitioned between HCl (4%, 30 ml) and CH2Cl2 (30 ml). The aqueous phase was extracted with CH2Cl2 (2×30 ml) and the combined organic phases were washed with HCl (4%, 30 ml) and brine (3×30 ml), dried over sodium sulphate and evaporated under reduced pressure affording 1-[(2S)-3-(chloromethoxycarbonyl)mercapto-2-methyl-1-oxopropyl]-L-proline as a clear oil (2.60 g) that was used without further purification.

1. custompartitioned between HCl (4%, 30 ml) and CH2Cl2 (30 ml)
2. extractionThe aqueous phase was extracted with CH2Cl2 (2×30 ml)
3. washthe combined organic phases were washed with HCl (4%, 30 ml) and brine (3×30 ml)
4. dry with materialdried over sodium sulphate
5. customevaporated under reduced pressure