A Facile Zn-mediated Stereoselective Synthesis of (<i>E</i>)- and (<i>Z</i>)-Trisubstituted Alkenes from Baylis–Hillman Adducts in Water and Its Application
A simple and efficient stereoselectivesynthesis of (E)- and (Z)-trisubstituted alkenes has been accomplished by treatment of the acetyl derivatives of the Baylis-Hillmanadducts with Zn in saturated aq. NH 4 Cl solution under reflux. The method has been utilized for the preparation of the two chiral insect pheromones, dominicalure-I and dominicalure-II, of the lesser grain borer Rhyzopertha dominica
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.