Properties and Reactions of Substituted 1,2-Thiazetidine 1,1-Dioxides: Chiral Mono- and Bicyclic 1,2-Thiazetidine 1,1-Dioxides fromα-Amino Acids
作者:Alexandra Meinzer、Andrea Breckel、Bassam Abu Thaher、Nico Manicone、Hans-Hartwig Otto
DOI:10.1002/hlca.200490021
日期:2004.1
New chiral mono- and bicyclic β-sultams, valuable building blocks for drug synthesis, have been prepared from L-Ala, L-Val, L-Leu, L-Ile, L-Phe, L-Cys, L-Ser, L-Thr, and D-penicillamine by transformation of the COOH group into a methylsulfonyl chloride function, followed by cyclization under basic conditions. Selected properties, derivatives, and reactions of the β-sultams are described.
Properties and Reactions of Substituted 1,2-Thiazetidine 1,1-Dioxides: Alkylation and Acylation of 3-Haloalkyl β-Sultams and Synthesis of Bicyclic β-Sultams
作者:Peter Schwenkkraus、Hans-Hartwig Otto
DOI:10.1002/ardp.19933260802
日期:——
Alkylation of the 3‐chloroethyl substituted β‐sultam 1 with bromoacetates yields the N‐ and 3‐substituted β‐sultams 2; exchange of halogens affords esters 3. Reactions of 1 or of the analogues 8 with isocyanates make the carbamoyl derivatives 5, 6, and 9 available. While cyclization of 6 with n‐BuLi in the presence of HMPT yields the bicyclic β‐sultams 7, the analogous reaction of 9 failed. The bicyclic