Benzene → t-butyl alpha-{6(R)-[8-t-butoxycarbonylamino-1(R)-ethoxycarbonyloctylamino]-5-oxo-2(S)-(2-thienyl)perhydro-1,4-thiazepin-4-yl}acetate

Participants

Reaction Steps

1.3 g of t-butyl α-[6(R)-amino-5-oxo-2(S)-(2-thienyl)perhydro-1,4-thiazepin-4-yl]acetate was treated with 1.73 g of ethyl 2-bromo-9-t-butoxycarbonylaminononanoate prepared as described in Preparation 4) in a similar manner to that described in Example 4. The product was then subjected to column chromatography through silica gel using a mixture of benzene and ethyl acetate in the ratio 5:1 by volume as the eluent. 237 mg of t-butyl α-{6(R)-[8-t-butoxycarbonylamino-1(R)-ethoxycarbonyloctylamino]-5-oxo-2(S)-(2-thienyl)perhydro-1,4-thiazepin-4-yl}acetate was obtained as a syrup from the fractions eluted first.

Provenance & Evidence