Stereoselective control in 1,3-dipolar cycloaddition of nitrones to substituted styrenes
作者:Ugo Chiacchio、Franco Casuscelli、Antonino Corsaro、Antonio Rescifina、Giovannni Romeo、Nicola Uccella
DOI:10.1016/s0040-4020(01)89695-2
日期:——
The stereochemistry of 1,3-dipolar cycloaddition of C-methyl-N-phenylnitrone 1 with substituted styrenes has been investigated. The presence of an hydroxyl function at the ortho position in the dipolarophile completely controls the stereochemical course of the reaction with the exclusive formation of cis cycloadduct 7. MNDO calculations help to rationalise the obtained results on the basis of an intermolecular
研究了C-甲基-N-苯基硝基1与取代苯乙烯的1,3-偶极环加成反应的立体化学。亲油性分子中邻位羟基官能团的存在完全控制了反应的立体化学过程,并仅形成顺式环加合物7。MNDO计算有助于在分子间氢键的基础上合理化获得的结果,这会导致FMO性质发生变化,从而改善导致顺式异构体的E-内过渡态的稳定次级轨道相互作用。