反应详情

0.85 g of t-butyl α-[6-amino-2-(2-naphthyl)-5-oxoperhydro-1,4-thiazepin-4-yl]acetate [prepared as described in step (g) above] was subjected to N-alkylation with 1.08 g of ethyl 2-bromo-4-phenylbutyrate in the same manner as described in Example 36(h). The reaction product was subjected to silica gel column chromatography, using a 1:30 by volume mixture of ethyl acetate and methylene chloride, to separate it into two isomers, A and B (ascribed to the asymmetric carbon atom to which the phenethyl group is attached).

1. customto separate it into two isomers