Synthesis of heteroatom-containing pyrrolidine derivatives based on Ti(O-<i>i</i>Pr)<sub>4</sub> and EtMgBr-catalyzed carbocyclization of allylpropargyl amines with Et<sub>2</sub>Zn
作者:Rita N. Kadikova、Ilfir R. Ramazanov、Azat M. Gabdullin、Oleg S. Mozgovoj、Usein M. Dzhemilev
DOI:10.1039/d0ra02677h
日期:——
2-alkynylamines with Et2Zn is equally selective in dichloromethane, hexane, toluene, and diethyl ether. The reaction was tolerant to the presence of aryl, alkyl, trimethylsilyl, methoxymethyl and aminomethyl substituents on the alkyne. A selective method was proposed for the preparation of bis-pyrrolidine derivatives using Ti–Mg-catalyzed carbocyclization of bis-allylpropargyl amines with Et2Zn.
Ti(O -i Pr) 4和 EtMgBr 催化的N-烯丙基取代的 2-炔基胺与 Et 2 Zn 的区域和立体选择性碳环化,然后进行氘解或水解,以高产率提供相应的亚甲基吡咯烷衍生物。发现 Ti-Mg 催化的N-烯丙基取代的 2-炔基胺与 Et 2的碳环化反应Zn 在二氯甲烷、己烷、甲苯和乙醚中具有同样的选择性。该反应容许炔烃上存在芳基、烷基、三甲基甲硅烷基、甲氧基甲基和氨基甲基取代基。提出了一种选择性方法,用于使用 Ti-Mg 催化的双烯丙基炔丙基胺与 Et 2 Zn的碳环化制备双吡咯烷衍生物。