反应详情

In a manner analogous to that described in Example 19(i), N-(benzyloxycarbonyl)-3-(4-tert.butoxyphenyl)-L-alanine (prepared from 7.45 g of the dicyclohexylammonium salt) was treated with isobutyl chloroformate followed by reaction with diazomethane to give 3.58 g of benzyl [2-(4-tert.butoxyphenyl)-1(S)-(2-diazoacetyl)ethyl]carbamate as a yellow solid of melting point 80°-82° C.