作者:Craig Siegel、Edward R. Thornton
DOI:10.1016/s0040-4039(00)80722-4
日期:1988.1
characteristics of this model are that the phenyl group is nearly perpendicular to the ester CO, i.e., the PhCCO dihedral angle is near 90°, and that the methoxy group is close to the carbonyl oxygen. These features may have wider applications for chiral control by α-chiral ester groups in other types of reactions. Our results should renew interest in the use of chiral 1-acyloxydienes.
1-(O-甲基扁桃氧基)二烯在不对称Diels-Alder反应中具有显着优势,我们现在表明,使用这些二烯可以实现高(90%)的非对映选择性,从而为亲二烯体和其他功能性的选择提供了可观的选择。我们目前的实验支持,包括显示三个Diels-Alder加合物构象的X射线结构,用于解释这些选择性起源的过渡态模型。该模型的显着特征是苯基几乎垂直于酯CO,即PhCCO二面角接近90°,甲氧基接近羰基氧。这些特征可用于在其他类型的反应中通过α-手性酯基进行手性控制。