(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 %。