Regio- and stereoselective synthesis of 1,4-dihydropyridines by way of an intramolecular interaction of a thiocarbonyl or carbonyl with a pyridinium nucleus
作者:Shinji Yamada、Tomoko Misono、Mayumi Ichikawa、Chisako Morita
DOI:10.1016/s0040-4020(01)00892-4
日期:2001.10
Chiral 1,4-dihydropyridines were prepared by the regio- and stereoselective addition of ketene silyl acetals and organometallic reagents to pyridinium salts. In the addition reaction, an intramolecular interaction between the thiocarbonyl or carbonyl with the pyridinium nucleus plays an important role in bringing about the selectivities. The absolute configuration of the newly produced stereogenic
通过将烯酮甲硅烷基乙缩醛和有机金属试剂向吡啶鎓盐进行区域和立体选择性加成来制备手性1,4-二氢吡啶。在加成反应中,硫代羰基或羰基与吡啶鎓核之间的分子内相互作用在实现选择性中起重要作用。在转化为合适的衍生物后,通过X射线分析和CD棉花效应确定新产生的1,4-二氢吡啶的立体异构中心的绝对构型。提出了基于RHF / 3-21G ∗的从头算的立体选择性的工作模型。