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
Properties and Reactions of Substituted 1,2-Thiazetidine 1,1-Dioxides: C-3 Substituted β-Sultams
作者:Peter Schwenkkraus、Hans-Hartwig Otto
DOI:10.1002/ardp.19933260905
日期:——
The analogous (R)‐3‐chloromethyl‐β‐sultam (12) is available from (R)‐benzylcysteinol (9). While the chlorine in 6 is replaced easily by iodine yielding 7, the analogous reaction with 12 fails. The 3‐(hydroxyethyl/methyl) substituted β‐sultams 17 and 21 are prepared by similar routes. All structures are established by spectroscopic.