2-Oxoalkylidenetriphenylphosphoranes undergo [3+2] annulation with enediones to give cyclopentenones as major products along with cyclohexenones.
2-氧代亚烷基三苯基正膦与烯二酮发生 [3+2] 环化反应,生成环戊烯酮和环己烯酮作为主要产物。
Annulation of 3-[(<i>R</i>)-<i>p</i>-Toluenesulfinyl]-2-oxopropylidenetriphenyl-phosphorane with 1,4-Enediones; Highly Enantioselective Synthesis of Cyclopentenones
作者:Minoru Hatanaka、Yoshiaki Shinohara、Takaaki Kurata、Hiroyoshi Kitano、Kazutsugu Matsumoto、Ichiro Takahashi、Shinzo Hosoi、Tomihisa Ota
DOI:10.1055/s-2002-32974
日期:——
3-[(R)-p-Toluenesulfinyl]-2-oxopropylidenetriphenyl-phosphorane reacted with 1,4-enediones in the presence of BuLi to give (4S,5R)-4-acylmethyl-5-[(R)-p-toluenesulfinylcyclopent-2-enones in a highly diastereoselective fashion. Subsequent desulfurization of the cyclization products furnished highly enantiomerically enriched (S)-4-acylmethylcyclopent-2-enones.