Nucleophilic additions to tricyclodecadienone epoxides. The Payne rearrangement of α,β-epoxycyclopentanols contained in a rigid tricyclic system
作者:Paul P.M.A. Dols、Esther G. Arnouts、Johannes Rohaan、Antonius J.H. Klunder、Binne Zwanenburg
DOI:10.1016/s0040-4020(01)87027-7
日期:1994.3
conditions and type of organometallic reagent. Reduction of 6 and 7 with lithium aluminum hydride yields the same tricyclic trans-1,3-diols 20. It is shown that reduction of 6 with lithium aluminum hydride proceeds via slow Payne rearrangement of its alkoxide 11b to inverted alkoxide 12b, followed by rapid addition of hydride to C4 from the exo-face.
有机金属试剂添加区域选择性和立体选择性地从凸外型-面到的羰基官能团外-4,5- epoxytricyclodecenones 5和8,得到三环外-环氧内切醇的6和9分别。这些初始加合物可以进行佩恩重排,分别得到倒位的内-环氧-外-醇7和10。重排取决于底物,实验条件和有机金属试剂的类型。减少6和7与氢化铝锂产生相同的三环反-1,3-二醇20。结果表明,减少的6经由慢佩恩重排氢化铝锂进行其醇盐11B到倒醇盐12B,接着迅速加入氢化至C 4从外面取向。