Intermolecular 1,3-dipolar cycloadditions of müchnones with acetylenic dipolarophiles: Sorting out the regioselectivity
作者:Brian P. Coppola、Mark C. Noe、David J. Schwartz、Robert L. Abdon、Barry M. Trost
DOI:10.1016/s0040-4020(01)80739-0
日期:1994.4
A series of 1,3-dipolar cycloadditions of münchnones with acetylenic dipolarophiles was studied, wherein factors related to regioselectivity were investigated. The results from münchnones with electronically divergent thioaryl substituents compared with others bearing alkyl substituents suggest that an unsymmetrical transition state structure, rather than FMO perturbation, plays a significant role
研究了一系列的慕尼黑1,3-偶极环加成与炔属双极亲和性,研究了与区域选择性有关的因素。具有电子发散的硫代芳基取代基的慕尼黑人与其他带有烷基取代基的慕尼黑人的结果表明,不对称的过渡态结构而不是FMO扰动在区域选择中起着重要作用。但是,如果日蚀相互作用排除了高度不对称的过渡态,那么最小化空间相互作用就变得很重要。一对互补取代的münchnones,仅同位素标记的位置不同,建立了中离子杂环的内在对称电子性质。