Stereoselective |2+2| photocycloaddition of chiral 2(5H)-furanones to alkenes
摘要:
The steric and stereoelectronic dependence of the diastereoselectivity in the photochemical \2 + 2\ cycloaddition of chiral 2(5H)-furanones to alkenes is investigated to prepare eventually cyclobutanic natural products. It is shown that the alkenes approach to different chiral 5-substituted 2(5H)-furanones mainly by the less hindered side.
[2+2] Photocycloaddition of homochiral 2(5H)-furanones to alkenes. First step for an efficient and diastereoselective synthesis of (+)- and (−)-grandisol
作者:Ramón Alibés、José L. Bourdelande、Josep Font、Anna Gregori、Teodoro Parella
DOI:10.1016/0040-4020(95)00957-4
日期:1996.1
The [2+2] photocycloaddition of homochiral 5-alkyl-2(5H)-furanones to alkenes is studied in order to evaluate the influence of the stereogenie centre to induce facial diastereoselectivity. The major cycloadduct could be transformed, eventually, in (+)-grandisol, The existence of a charge-transfer complex between the furanone and electron rich substituted alkenes as well as the formation of a predominant
Stereoselective |2+2| photocycloaddition of chiral 2(5H)-furanones to alkenes
作者:Ramón Alibés、José L. Bourdelande、Josep Font
DOI:10.1016/s0957-4166(00)80035-x
日期:1991.1
The steric and stereoelectronic dependence of the diastereoselectivity in the photochemical \2 + 2\ cycloaddition of chiral 2(5H)-furanones to alkenes is investigated to prepare eventually cyclobutanic natural products. It is shown that the alkenes approach to different chiral 5-substituted 2(5H)-furanones mainly by the less hindered side.