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.
Carbenoid insertion into alkenylzirconocenes—a convergent synthesis of functionalised allylmetallics
作者:Alexander N. Kasatkin、Richard J. Whitby
DOI:10.1016/s0040-4039(00)01024-8
日期:2000.8
Insertion of lithium alkylcarbenoids RC(A)LiX, A= CN, P(O)(OEt)(2), SO2Ph, OMe into alkenylzirconocene chlorides derived by hydrozirconation of terminal alkynes affords functionalised allylzirconium reagents which may be further elaborated. (C) 2000 Elsevier Science Ltd. All rights reserved.
Yoneda, Ryuji; Harusawa, Shinya; Kurihara, Takushi, Chemical and pharmaceutical bulletin, 1987, vol. 35, # 2, p. 913 - 915