(−)-(2<i>S</i>,3<i>R</i>,<i>Z</i>)-Nakinadine A: First Asymmetric Synthesis and Absolute Configuration Assignment
作者:Stephen G. Davies、Ai M. Fletcher、Paul M. Roberts、Rushabh S. Shah、Amber L. Thompson、James E. Thomson
DOI:10.1021/ol500096r
日期:2014.3.7
(Z)-14-(pyridin-3′-yl)tetradec-11-enal has been used as the key step in the first asymmetric synthesis of (−)-nakinadine A. Both the 2,3-syn- and 2,3-anti-diastereoisomers were prepared; comparison of spectroscopic and specific rotation data facilitated assignment of the absolute (2S,3R,Z)-configuration within the natural product. (−)-(2S,3R,Z)-Nakinadine A was prepared in 10 steps from 11-bromoundecan-1-ol
与甲基苯乙酸的曼尼希型反应ñ -叔丁基亚亚胺从(派生- [R )-叔-butylsulfinamide和(Ž)-14-(吡啶-3'-基)十四碳-11-烯醛已被用作关键制备2,3-顺-和2,3-抗-非对映异构体两者;(-)-那金那汀A的第一不对称合成中的步骤。光谱和特定旋转数据的比较有助于在天然产物中分配绝对(2 S,3 R,Z)-构型。(−)-(2 S,3 R,Z)-那金那定A由11-溴苯甲酰胺-1-醇分10步制备,总产率为10%,dr [(Z):( E)比]为97:3 dr,ee≥98 %。