Acceleration of the intramolecular Diels-Alder reaction of vinylsulfonic esters and amides bearing acyclic and carbocyclic 1,3-diene moieties by application of high pressure leads to excellent yields of sultones and sultams, respectively, at ambient temperature. The influence of pressure on the stereoselectivity of these processes has been investigated. (C) 2000 Elsevier Science Ltd. All rights reserved.
Intramolecular Diels-Alder reaction of vinylsulfonates derived from hydroxyalkyl substituted 1,3-dienes and oxidative desulfurization of the resultant sultones
作者:Peter Metz、Michael Fleischer、Roland Fröhlich
DOI:10.1016/0040-4020(94)00969-2
日期:1995.1
Vinylsulfonates prepared from hydroxyalkyl substituted cycloalka-1,3-dienes and acyclic 1,3-dienes by esterification with vinylsulfonyl chloride cycloadd to δ-sultones at temperatures ranging from 0 °C to reflux in toluene. High diastereoselectivity is observed for substrates 2 featuring a cyclic 1,3-diene moiety, whereas a substituent R2 larger than hydrogen is necessary to achieve good to excellent
Sultones are readily prepared by intramolecular Diels-Alder reaction of vinylsulfonates in an often highly stereoselective fashion. Various methods for the synthetic elaboration of these heterocycles have been developed and applied to the total synthesis of biologically active natural products.