Synthesis of Vinca Alkaloids and Related Compounds, XXXIV Synthesis of (3S, 14S, 16S)-Bromovincamines and Bromoapovincamines by Regioselective Bromination
作者:Lajos Szabó、László Dobay、György Kalaus、Eszter Gács-Baitz、József Tamás、Csaba Szántay
DOI:10.1002/ardp.19873200904
日期:——
By bromination of the iminium salt 2a (X‐Cl), the 9‐bromo derivative 2c (X=ClO4) is obtained in isomerfree state. Bromination of the lactam 8d leads to a ca. 7.5:1 mixture of 11‐bromo (8c) and 9‐bromo (8a) lactams. These precursors have been used to synthesize 9‐, 10‐ and 11‐bromovincamines (11a‐c), and 9‐, 10‐ and 11‐bromoapovincamines (12a‐c).
通过亚胺盐 2a (X-Cl) 的溴化,得到无异构体状态的 9-溴衍生物 2c (X = ClO4)。内酰胺 8d 的溴化导致 11-溴 (8c) 和 9-溴 (8a) 内酰胺的约 7.5:1 混合物。这些前体已被用于合成 9-、10- 和 11- 溴春胺 (11a-c) 以及 9-、10- 和 11- 溴春胺 (12a-c)。