Amide-Group-Directed Protonolysis of Cyclopropane: An Approach to 2,2-Disubstituted Pyrrolidines
作者:Marija Skvorcova、Aigars Jirgensons
DOI:10.1021/acs.orglett.7b00584
日期:2017.5.19
Regioselective protonolytic C–C bond cleavage of acylated aminomethyl cyclopropanes can be achieved using trifluoroacetic acid. The intermediate tertiary carbenium ion undergoes an intramolecular amination to give 2,2-substituted pyrrolidines. The strength of the acid and the amine substituent are important factors to achieve high regioselectivity, suggesting intramolecular proton transfer from the
使用三氟乙酸可以实现酰化氨基甲基环丙烷的区域选择性质子水解C–C键裂解。中间叔碳鎓离子进行分子内胺化,得到2,2-取代的吡咯烷。酸和胺取代基的强度是实现高区域选择性的重要因素,表明分子内质子从质子化酰胺官能团转移。初步的机理研究表明,进行环丙烷裂解时,质子附着的碳原子上的构型得以保留。该观察结果与CC键的“边缘”质子化轨迹一致。