Studies on the mechanism of quaternization of the catharanthine part of vinblastine and vincristine
作者:Péter Keglevich、Péter Ábrányi-Balogh、Áron Szigetvári、Csaba Szántay、Csaba Szántay、László Hazai
DOI:10.1016/j.tetlet.2016.03.004
日期:2016.4
A quaternization reaction was observed at the tertiary nitrogen atom of the catharanthine part of vinblastine instead of the expected cyclopropanation in the Simmons–Smith reaction utilizing diiodomethane and diethylzinc. Investigating the energetic relations, thermodynamic stabilities and the interactions between the molecular orbitals by quantum chemical calculations elucidated the unexpected methylation