Vinyl carbanions derived from cis-cinnamonitrile-reactions with electrophiles and configurational stability
作者:B.A. Feit、U. Melamed、R.R. Schmidt、H. Speer
DOI:10.1016/s0040-4020(01)97971-2
日期:1981.1
Vinyl carbanions derived from cis-cinnamonitrile 1 were formed by reacting it with lithium diisopropylamide (LDA) as a base in aprotic solvents at low temperatures; reaction with various electrophiles (E) resulted in the corresponding derivatives PhCHC(E)CN. The configurational stability of the vinyl carbanions derived from 1 and the geometry of the reaction products was affected by the solvating
顺式-肉桂腈1衍生的乙烯基碳负离子是通过在低温下在质子惰性溶剂中与二异丙基氨基化锂(LDA)作为碱反应而形成的;与各种亲电子试剂(E)的反应生成相应的衍生物PhCHC(E)CN。衍生自1的乙烯基碳负离子的构型稳定性和反应产物的几何形状受介质的溶剂化性能影响。在差的溶剂化介质-二乙醚-己烷(4:1)中保持构型。加入冠醚或使用THF作为溶剂,得到具有反式几何结构的产物。肉桂腈(顺式和反式)去质子化的部位。)与肉桂酸酯进行了比较并进行了讨论。根据产物的1 H NMR光谱确定其几何形状。