The cyclisation of N-tosyl-oxiranepropylamines is accomplished in aqueous basic medium and in anhydrous acid medium as well. In most cases, this reaction occurs by a regiospecific 5-exo-tet. ring closure and affords N-tosyl-2-pyrrolidinemethanols in high yields. The formation of N-tosyl-3-piperidinols through endo attack on the epoxide linkage is observed only in systems exhibiting geometric constraints
                                    N-
甲苯磺酰基-
环氧乙烷丙胺的环化反应在
水性碱性介质和无
水酸介质中完成。在大多数情况下,该反应是通过区域特异性的5 -exo-tet发生的。闭环并以高收率提供N-
甲苯磺酰基-2-
吡咯烷
甲醇。的形成Ñ
甲苯磺酰基-3- piperidinols通过内上
环氧化物配合攻击是在过渡态表现出几何约束系统只观察到。这些环化伴随着经历亲核攻击的碳的构型反转。因此,N-
甲苯磺酰基-
环氧乙烷丙胺的环化开辟了功能性
吡咯烷的有效入口,并有望在合成中找到有用的应用。