Tri- and Tetrasubstituted N-Phthalimidoaziridines in 1,3-Dipolar Cycloaddition Reactions
作者:Alexander V. Ushkov、Mikhail A. Kuznetsov、Anthony Linden、Heinz Heimgartner
DOI:10.1002/hlca.200900466
日期:2010.5
conservation of orbital symmetry in concerted reactions. The analogous reactions of the tetrasubstituted phthalimidoaziridine 1b with thioketones at 40° lead to the 1,3‐thiazolidine derivatives 10 and 11 as mixtures of diastereoisomers. These unexpected results may be explained by either the isomerization of the intermediate azomethine ylides or a non‐concerted stepwise cycloaddition reaction of these ylides
的2,2,3-三取代的热反应Ñ -phthalimidoaziridine 1A与乙炔二(DMAD),硫酮4A - 4D,和偶氮二羧酸二甲酯(5)在室温下继续进行,甚至导致了五元cycloadducts 2A,6 -与基于协同反应中的轨道对称性守恒的期望相反,图8和图12分别保留了氮丙啶取代基的空间排列。四取代邻苯二甲酰亚胺基氮丙啶1b与硫酮在40°的类似反应导致1,3-噻唑烷衍生物10和11为非对映异构体的混合物。这些意外的结果可能是由于中间体偶氮甲亚胺基团的异构化或这些基团与双亲性化合物的未经证实的逐步环加成反应所致。一些加合物的结构已通过X射线晶体学测定。