作者:Gilles Hanquet、Xavier J. Salom-Roig、Laurence Gressot-Kempf、Steve Lanners、Guy Solladié
DOI:10.1016/s0957-4166(03)00125-3
日期:2003.5
New developments in the reduction of beta,delta-diketo-sulfoxides, a reaction that affords important key intermediates for total synthesis, are described. We showed without ambiguity using NMR experiments, that the beta-carbonyl group is totally enolised. This result is inconsistent with the previous hypothesis, which supposed the other tautomer (enolisation at the delta-position) as the major one. We propose a rationale to explain the side reactions occurring during the reduction of unprotected beta,delta-diketo-sulfoxides and showed that judicious protection of the delta-carbonyl group gave all diastereoisomers of beta-hydroxy-delta-ketosulfoxides. (C) 2003 Elsevier Science Ltd. All rights reserved.