Intramolecular Diels-Alder reaction of chiral, highly oxygenated trienoates derived from sugar allyltins
作者:Slawomir Jarosz、Elżbieta Kozlowska、Artur Jeżewski
DOI:10.1016/s0040-4020(97)00677-7
日期:1997.8
The Lewis acid catalyzed intramolecular Diels-Alder reaction of sugar derived trienoates 3 led preferably to bicyclic endo-adducts 4. The best stereoselectivity was observed for cyclization of the L-arabino-trienoate 3b, in which only one isomer (trans) was formed. High pressure (15 kbar) cycloaddition of 3a, 3b, and 3c, led to single stereoisomers 4a, 4b, and 4c in good yields. Conversion of adduct
路易斯酸催化糖衍生的三烯酸酯3的分子内Diels-Alder反应优选导致双环内加合物4。对于L-阿拉伯糖三酸酯3b的环化,观察到最佳的立体选择性,其中仅形成一种异构体(反式)。3a,3b和3c的高压(15 kbar)环加成反应导致单立体异构体4a,4b和4c的产率很高。描述了加合物4a向手性环戊烷的转化。