Synthesis of sparteine-like chiral diamines and evaluation in the enantioselective lithiation–substitution of N-(tert-butoxycarbonyl)pyrrolidine
作者:Jean-Paul R. Hermet、David W. Porter、Michael J. Dearden、Justin R. Harrison、Tobias Koplin、Peter O'Brien、Jérôme Parmene、Vladimir Tyurin、Adrian C. Whitwood、John Gilday、Neil M. Smith
DOI:10.1039/b308410h
日期:——
methods. These diamines lacked the bispidine framework of (-)-sparteine and were found to impart vastly inferior enantioselectivity. It was concluded that, for the asymmetric lithiation substitution of N-Boc pyrrolidine, a rigid bispidine framework and only three of the four rings of (-)-sparteine are needed for high enantioselectivity. Furthermore, it is shown that diamine (1R,2S,9S)-11-methyl-7,11-diazatricyclo[7
合成了三种手性二胺,并在N-(叔丁氧基羰基)吡咯烷的锂取代反应中作为斯巴甜代孕激素进行了评估。合成并尝试拆分出像斯巴丁胺的二胺[(1S *,2R *,8R *)-10-甲基-6,10-二氮杂三环[6.3.1.0(2,6)]十二烷和(1S *,2R *,报告了9R *)-11-甲基-7,11-二氮杂三环[7.3.1.0(2,7)]十三烷](通过包合物形成)。不幸的是,仅可能拆分二氮杂三环[7.3.1.0(2,7)]十三烷化合物。描述了从天然产物(-)-胱氨酸开始到(1R,2S,9S)-11-甲基-7,11-二氮杂三环[7.3.1.0(2,7)]十三烷的替代途径。这条简单的三步路线提供了(+)-天冬氨酸替代品的克量。该路线中的中间体(1R,5S,12S)-3-甲氧基羰基十氢-1,5-甲氧基吡啶并[1,2-a] [1,5] diazocin-8-one可以明确建立本文所述的所有三环二胺的立体化学