作者:Andrey E. Sheshenev、Mark S. Baird、Anna K. Croft、Ivan G. Bolesov
DOI:10.1016/j.tet.2009.09.098
日期:2009.11
generation of 3-phenylcyclopropenes is described. Reaction of these compounds with a range of dienophiles and dipolarophiles led to the stereoselective formation of [4+2]- and [3+2]-cycloadducts, which were exclusively exo-3-phenyl-cis-1,2-disubstituted cyclopropanes. Efficient trapping of 1-lithio-3-phenylcyclopropene with different electrophiles is also discussed. Ab initio calculations suggest that
描述了一种方便且廉价的生成3-苯基环丙烯的方法。这些化合物与一系列亲双烯体和亲双亲体的反应导致立体选择性地形成[4 + 2]-和[3 + 2]-环加合物,它们仅是外-3-苯基顺式-1,2-二取代的环丙烷。还讨论了用不同的亲电子试剂有效捕集1-硫代-3-苯基环丙烯的方法。从头算计算表明,最低能量构象的3-苯基环丙烯具有垂直于环丙烯π键的苯环平面,但旋转势垒较低。