Asymmetric Synthesis of Acyclic 1,3-Amino Alcohols by Reduction of <i>N</i>-Sulfinyl β-Amino Ketones. Formal Synthesis of (−)-Pinidinol and (+)- Epipinidinol
作者:Franklin A. Davis、Paul M. Gaspari、Brad M. Nolt、Peng Xu
DOI:10.1021/jo801653c
日期:2008.12.19
Stereoselective reduction of acyclic N-sulfinyl beta-amino ketones with (LiEt(3)BH) and Li(t-BuO)(3)AlH, respectively, gave anti- and syn-1,3-amino alcohols with excellent selectivity. A formal asymmetric synthesis of the hydroxy piperidine alkaloids (-)-pinidinol and (+)-epipinidinol from a common N-sulfinyl beta-amino ketone ketal precursor was developed. The pinidinol piperidine ring was formed
分别用(LiEt(3)BH)和Li(t-BuO)(3)AlH立体选择性还原无环N-亚磺酰基β-氨基酮,得到具有优异选择性的抗和syn-1,3-氨基醇。从常见的N-亚磺酰基β-氨基酮缩酮前体开发了羟基哌啶生物碱(-)-吡啶醇和(+)-哌啶醇的形式不对称合成。吡啶醇哌啶环是通过N-亚磺酰基氨基甲硅烷基保护的醇缩酮的新型酸催化级联反应形成的。