A new access to enantiopure β-hydroxylated piperidines from N-Boc-2-acyloxazolidines. Application to the synthesis of (−)-desoxoprosopinine and (+)-pseudoconhydrine
作者:Claude Agami、François Couty、Hubert Lam、Hélène Mathieu
DOI:10.1016/s0040-4020(98)00508-0
日期:1998.7
The synthesis of (−)-desoxoprosopinine and (+)-pseudoconhydrine were achieved from a common oxazolidine precursor. The three stereocenters present in (−)-desoxoprosopinine as well as the two stereocenters of (+)-pseudoconhydrine were created in highly stereoselective ways. The stereoselectivity observed during the reduction of the ketone moiety in the starting oxazolidine was dependent on the occurrence
从一种常见的恶唑烷前体中可以合成(-)-去氧oprosopinopine和(+)-假conconhydrine。(-)-去氧胸苷的存在的三个立体中心以及(+)-伪conhydrine的两个立体中心是通过高度立体选择性的方式创建的。在起始恶唑烷酮的酮部分还原过程中观察到的立体选择性取决于螯合中间体的存在。其他立体中心是由中间亚胺离子的立体选择性还原或烷基化引起的。