Organic Reactions in Water: An Efficient Zinc-Mediated Stereoselective Synthesis of (<i>E</i>)- and (<i>Z</i>)-Trisubstituted Alkenes Using Unactivated Alkyl Halides
[reaction: see text] Treatment of the acetyl derivatives of the Baylis-Hillman adducts 3-hydroxy-2-methylene-alkanoates and 3-hydroxy-2-methylene-alkanenitriles with unactivated alkyl halides in the presence of Zn in saturated aqueous NH(4)Cl solution at room temperature afforded (2E)-2-substituted-alk-2-enoates in the first case and (2Z)-2-substituted-alk-2-enenitriles with high (Z)-selectivity in
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
Stereoselective synthesis of (E)- and (Z)-allylamines has been achieved in a single-step by treatment of the acetyl derivatives of Baylis-Hillman adducts with ammonium acetate in anhydrous methanol at room temperature. The reaction proceeded under neutral conditions to form the corresponding allylamines in high yields and stereoselectivity.
Regioselective Synthesis of 5H-Thiazolo[3,2-a]pyrimidin-5-ones from Morita-Baylis-Hillman Adduct Acetates under Solvent-Free and Base-Free Conditions
作者:Weike Su、Weihui Zhong、Baoming Guo、Fuliang Lin、Yongliang Liu
DOI:10.1055/s-0028-1088051
日期:2009.5
with high regioselectivity by nucleophilic addition of thiazol-2-amines to Morita-Baylis-Hillmanadduct acetates, followed by cyclization and a thermo-sigmatropic shift procedure under solvent-free and base-free conditions. fused-ring systems - heterocycles - α,β-unsaturated esters - thiazol-2-amines - solvent-free - base-free
通过将噻唑-2-胺亲核加到森田-贝利斯-希尔曼加合物乙酸酯中,然后环化和制备5 H-噻唑并[3,2- a ]嘧啶-5-酮,可以以良好至优异的收率和高区域选择性轻松制备。在无溶剂和无碱条件下进行热-色移程序。 稠环系统-杂环-α,β-不饱和酯-噻唑-2-胺-无溶剂-无碱
Fast, Microwave-Promoted One-Pot Synthesis of Bicyclic Pyrimidones from Baylis-Hillman Adducts
作者:Yongliang Liu、Kun Wan、Zengxue Wang
DOI:10.3184/174751915x14199645231447
日期:2015.2
Two types of fused pyrimidones, 3-substituted-7-chloro-4H -pyrimido[1,2-b]pyridazin-4-ones and 6-substituted-5H-thiazolo-[3,2-a]pyrimidin-5-ones were easily prepared from Baylis-Hillman adduct acetates under microwave irritation in high yields.