A formal haloalkynylation of allenamides has been described for the synthesis of highly stereo- and regioselective skipped halo enynes. Exclusive γ-regioselectivity is achieved through the intermediacy of a conjugated N-tosyliminium intermediate—direct evidence for the formation of which was validated by NMR and HRMS. Quantum mechanical computations reveal that the reactive intermediate geometry is
已经描述了烯丙酰胺的正式卤代炔基化反应,用于合成高度立体和区域选择性跳过的卤代烯炔。独特的γ-区域选择性是通过共轭N-
甲苯磺
酰亚胺中间体中间体实现的,该化合物的直接形成证据已通过NMR和HRMS验证。量子力学计算表明,反应性中间几何结构是控制
炔烃拦截的1,2-或1,4-区域选择性的关键。也已经报道了难以捉摸的不饱和系统的进入途径。