A concise synthesis of β-lactam–sulfonamide hybrids
摘要:
Using ring closing metathesis (RCM) as the key operation, a rapid access to beta-lactams fused to a sultam moiety of variable ring size was developed from low cost, commercially available starting materials. An efficient RCM of 4-vinyl-azetidin-2ones to give I-aza-bicyclo[4.2.0]oct-4-en-8-ones is also reported. (C) 2004 Elsevier Ltd. All rights reserved.
[reaction: see text] A new class of N-substituted radical has been studied. Obtained from the corresponding chlorides, beta-lactamido N-sulfonyl radicals were allylated and added onto electron-richolefins. It has been shown that the radicals do not undergo desulfonylation and are electrophilic in nature.