Diastereoselective synthesis of substituted prolines via 5-endo-trig cyclisations of aza-[2,3]-Wittig sigmatropic rearrangement products
作者:James C. Anderson、Elizabeth A. Davies
DOI:10.1016/j.tet.2010.04.095
日期:2010.8
3]-Wittig sigmatropic rearrangement products from α-amino acid derivatives are susceptible to a rare nucleophilic 5-endo-trig cyclisations of an amine onto a non-conjugated vinylsilane in high yield and complete diastereocontrol. Five examples are presented, with cyclisation yields between 35 and 87%. A rationale for the stereoselectivity of the cyclisation is forwarded based upon the steric control factors
的氮杂主要非对映体[2,3] -Wittigσ迁移重排产物从α氨基酸衍生物很容易受到亲核罕见5-内切- trig的胺的环化到以高收率和完整diastereocontrol非共轭乙烯基硅烷。给出了五个例子,环化产率在35%至87%之间。基于已针对aza- [2,3] -Wittigσ重排所记录的空间控制因素,提出了环化立体选择性的基本原理。还对反应条件下的机理进行了讨论。甲硅烷基被氧化成羟基并被完全去除已证明可用于合成。