anti-Aldol reactions of chiral alcohol-substituted vinylogous urethanes and the synthesis of (−)-prelactone B
作者:Yu-Jang Li、Hsiu-Yin Hung、Yu-Wei Liu、Pei-Jhen Lin、Hung-Jyun Huang
DOI:10.1016/j.tet.2010.12.009
日期:2011.2
alcohol-substituted vinylogous urethanes, in which the double bond has E configuration was determined by single crystal X-ray analysis. In addition, we investigated the anti-aldol reactions of these chiral vinylogous urethane anions. The use of (1S,2R,4R)-1-(hydroxydiphenylmethyl)-7,7-dimethylbicyclo[2,2,1]-heptan-2-ol as a chiral auxiliary, provided the best enantioselectivities, and the resulting vinylogous urethane
本文描述了一种方便有效的合成手性醇取代的乙烯基氨基甲酸酯的方法,其中通过单晶X射线分析确定了具有E构型的双键。另外,我们研究了这些手性乙烯基类氨基甲酸酯阴离子的抗醛醇缩合反应。使用(1 S,2 R,4 R)-1-(羟基二苯甲基)-7,7-二甲基双环[2,2,1]-庚-2-醇作为手性助剂,可提供最佳对映选择性,并且所得的乙烯基类氨基甲酸酯内酯可用于合成(-)-内酯B。讨论了主要对映异构体生成的合理机理。