one Similarly, enantiomerically pure dienyl ether (-)-(1S)-4a reacted with 1-(trimethylsilyloxy)cyclohexene (12) to give a 14.1:1 mixture of (-)-(2S)-2-(1S,2Z,4R)-2-methyl-4-(methylsulfonyl)-1-[(S)-1-(2,4,6-triis opropylphenyl)ethoxy]pent-2-enyl}cyclohexanone ((-).13a) and its diastereoisomer 14a with (1S,2R,4R) or (1R,2S,4S) configuration. Structures of (+/-).10, (+/-).11, and (-).13a were established
4S)配置。(+/-).10、(+/-).11 和(-).13a 的结构是通过单晶X 射线晶体学建立的。使用带有 (1S)-1-苯乙基和 (1S)-1-(五氟苯基)乙基代替格林的辅助((1S)-(2,4,6-三异丙基苯基)乙基)。结果表明在β-烷氧基酮的四组分合成中可以获得高α/β-syn和不对称诱导(由于手性助剂)。该方法生成对映体纯的多官能甲基砜,其在 C 原子上具有三个手性中心和一个 (Z)-烯烃部分。使用带有 (1S)-1-苯乙基和 (1S)-1-(五氟苯基)乙基代替格林的辅助((1S)-(2,4,6-三异丙基苯基)乙基)。结果表明在β-烷氧基酮的四组分合成中可以获得高α/β-syn和不对称诱导(由于手性助剂)。该方法生成对映体纯的多官能甲基砜,其在 C 原子上具有三个手性中心和一个 (Z)-烯烃部分。使用带有 (1S)-1-苯乙基和 (1S)-1-(五氟苯基)乙基代替格林的辅助((1S)-(2
Total Synthesis of Polypropionate Natural Products: Application of New Sulfur Dioxide Chemistry
作者:C. Craita、L. Bouchez、M. Turks、X. Huang、F. Fonquerne、M. C. Murcia、P. Vogel
DOI:10.1080/10426500590910828
日期:2005.3.2
Abstract In the presence of a Lewis or protic acid at low temperature, electron-rich dienes add to sulfur dioxide and carbon nucleophiles generating silyl sulfinates. The latter can be transformed into valuable polyketide precursors.