Nitrosocarbonyl hetero-Diels–Alder cycloaddition with 2-substituted 1,3-butadienes
作者:Robert B. Lewis、Javier Read de Alaniz
DOI:10.1016/j.tet.2016.11.046
日期:2017.7
A study of the reactivity of 2-substituted 1,3-butadienes with nitrosocarbonyl compounds in the 4+2 cycloaddition has been carried out showing that the regioselectivity involves a delicate balance of steric and electronic effects. 2-Aryl 1,3-butadienes favor the distal isomer with the magnitude of preference ranging from 4:1 to 15:1 depending on the nature of the nitrosocarbonyl group. However, when
已经进行了在4 + 2环加成中2-取代的1,3-丁二烯与亚硝基羰基化合物的反应性的研究,表明区域选择性涉及空间和电子效应的精细平衡。根据亚硝基羰基的性质,2-芳基1,3-丁二烯偏向于远端异构体,其优先级的范围为4:1至15:1。然而,当使用大体积的2-取代的二烯时,优先形成近端异构体。获得的结果以及先前的理论计算和实验数据,为进一步的综合规划提供了进一步的数据。