反应详情

0.22 g of the isomer of t-butyl α-[6-amino-5-oxo-2-phenylperhydro-1,4-thiazepin-4-yl]acetate [prepared as described in step (h) above] was subjected to N-alkylation with 0.28 g of ethyl 2-bromo-4-phenylbutyrate in the same manner as described in Example 1(h). The resulting product was subjected to silica gel column chromatography, using a 1:20 by volume mixture of ethyl acetate and methylene chloride as the eluent. From the fraction first eluted was obtained 0.14 g of t-butyl α-{6-[1-ethoxycarbonyl-3-phenylpropylamino]-5-oxo-2-phenylperhydro-1,4-thiazepin-4-yl}acetate as an oil.

1. washFrom the fraction first eluted