Stereoselective Synthesis of Enantiomerically Pure Nupharamine Alkaloids from Castoreum
作者:Alexander Stoye、Gabriele Quandt、Björn Brunnhöfer、Elissavet Kapatsina、Julia Baron、André Fischer、Markus Weymann、Horst Kunz
DOI:10.1002/anie.200805606
日期:2009.3.9
An animalic note: The first total synthesis of the all‐cis nupharamine 2, an alkaloid from beaver castoreum, is based on the stereoselective domino Mannich–Michael reaction of N‐galactosylfurylaldimine to give 1 (Piv=pivaloyl), subsequent conjugate cuprate addition, and stereoselective protonation of the enolate. These reactions are all controlled by the carbohydrate. Protonation of the enolate after
动物性注释:全顺式nupharamine 2(一种来自海狸castoreum的生物碱)的首次总合成是基于N-半乳糖基呋喃基乙二胺的立体选择性多米诺骨牌Mannich-Michael反应生成1(Piv = pivaloyl),随后加入共轭铜酸盐和烯醇的立体选择性质子化。这些反应都由碳水化合物控制。辅酶裂解后烯醇化的质子导致差向异构体3。