t-Butyl alpha-(6-amino-5-oxo-2-phenylperhydro-1,4-thiazepin-4-yl)acetate → t-Butyl alpha-[6-(1-benzyloxycarbonyl-3-phenylpropylamino)-5-oxo-2-phenylperhydro-1,4-thiazepin-4-yl]acetate

Participants

Reaction Steps

0.34 g of t-butyl α-(6-amino-5-oxo-2-phenylperhydro-1,4-thiazepin-4-yl)acetate [prepared as described in Example 7(g)] was N-alkylated with 0.50 g of benzyl 2-bromo-4-phenylbutyrate in the same manner as in Example 1(h). The reaction product was subjected to silica gel column chromatography using a 1:40 by volume mixture of ethyl acetate and methylene chloride as eluent, to separate it into two isomers, A and B, (ascribed to the asymmetric carbon atom to which the phenethyl group is attached).

Provenance & Evidence