Formal [4 + 1]-Cycloaddition of Homopropargyl Alcohols to Diazo Dicarbonyl Compounds Giving Substituted Tetrahydrofurans
摘要:
A novel formal [4 + 1]-cycloaddition of readily available homopropargyl alcohols with diazo dicarbonyl compounds is described, which involves tandem O-H insertion/Conia-ene cyclization under cooperative Rh(II)/Zn(II) catalysis. This reaction provides easy access to various substituted tetrahydrofurans and exhibits complete E-selectivity in the case of nonterminal alkynes.
Synergistic Diazo-OH Insertion/Conia-Ene Cascade Catalysis for the Stereoselective Synthesis of<i>γ</i>-Butyrolactones and Tetrahydrofurans
作者:Arianne C. Hunter、Steven C. Schlitzer、Indrajeet Sharma
DOI:10.1002/chem.201603934
日期:2016.11.2
A novel and highlyefficient diazo‐OH insertion/Conia‐ene cascade reaction of readily available homopropargylic acids and alcohols with diazo carbonyl compounds is described. The cascade reaction involves a synergistic Rh/Ag/Au catalyst cocktail and proceeds instantly with a variety of substituted diazo compounds and acids/alcohols to provide functionalized γ‐butyrolactones and tetrahydrofurans with
描述了一种新颖,高效的重氮-OH插入/苯并-烯级联反应,该反应可容易获得的均丙酸和醇与重氮羰基化合物。级联反应涉及协同的Rh / Ag / Au催化剂混合物,并立即与多种取代的重氮化合物和酸/醇进行反应,以提供具有完全区域和立体选择性的官能化γ-丁内酯和四氢呋喃。空前的速率增强,完全的立体选择性以及新的Coniaene环化的实现表明在协同(Rh / Ag / Au)催化条件下,一致的[4 + 1]-环加成反应途径。