Synthesis of (Z)-predominant α,β-unsaturated nitriles from enone cyanohydrin diethyl phosphates: application to the synthesis of (±)-nuciferal, (±)-(E)- and -(Z)-nuciferol, and (±)-manicone
作者:Ryuji Yoneda、Shinya Harusawa、Takushi Kurihara
DOI:10.1039/p19880003163
日期:——
phosphates reacted regio- and stereo-selectively with a variety of organocopper reagents to give γ-coupling products, (Z)-predominant alk-2-enenitriles. The methodology was applied to the synthesis of (±)-nuciferal, (±)-(E)- and -(Z)-nuciferol, and (±)-manicone.
The first method for cyano-phosphorylation of aldehydes with diethyl cyanophosphonate in the presence of N-heterocyclic carbene prepared from 1,3-bis(2,4,6-trimethylphenyl)imidazolium chloride and KOt-Bu, as a nucleophilic catalyst, is described.