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
由羟烷基取代的环烷基-1,3-二烯和无环的1,3-二烯通过与乙烯基磺酰氯环化酯化反应制得的乙烯基磺酸酯在0°C至甲苯回流温度范围内加至δ-磺内酯。对于具有环状1,3-二烯部分的底物2,观察到高非对映选择性,而对于具有无环1,3-二烯单元的底物9,要达到良好至优异的立体控制水平,必须有大于氢的取代基R 2。生成的磺内酯的氧化脱硫通过 硼酸酯化和随后的过酸处理产生羟基酮,因此建立了乙烯基磺酰氯作为分子内Diels-Alder环加成反应的区域和立体选择性反应的乙烯酮当量。