Synthesis of novel 1,2,5-benzothiadiazepine 1,1-dioxides
作者:Thomas M Krülle、Jac C.H.M Wijkmans
DOI:10.1016/s0040-4020(01)00658-5
日期:2001.8
3-Methoxycarbonyl-2-N-methyl-1,2,5-benzothiadiazepine 1,1-dioxide 2b can be obtained in seven unambiguous steps starting from commercially available l-serine methyl ester. The crucial step in the synthesis of 2b is the intramolecular Michael addition of dehydroalanine derivative 17, which can be achieved using sodium tert-butoxide as a non-nucleophilic base. An initial attempt to construct the same