Applications of Thermal Activation, Ball-milling and Aqueous Medium in Stereoselective Michael Addition of Nitromethane to Enynones Catalyzed by Chiral Squaramides
作者:Żaneta A. Ignatiuk、Mikołaj J. Janicki、Robert W. Góra、Krzysztof Konieczny、Rafał Kowalczyk
DOI:10.1002/adsc.201801498
日期:2019.3.5
to conjugated en‐ynones was performed through the application of chiral squaramides. Three non‐classical approaches to promote the addition reaction were tested, including activation of the nucleophile by inorganic base in a biphasic aqueous system, thermal activation, and ball‐milling. Hydrogen‐bonding catalysis was effective in all these methods, providing 1,4‐addition products in high yields and
硝基甲烷的立体选择性加成是通过应用手性方酰胺来实现的。测试了三种促进加成反应的非经典方法,包括双相水性体系中无机碱对亲核试剂的活化,热活化和球磨。氢键催化在所有这些方法中均有效,以高收率和高达98%的立体选择性提供1,4加成产物,需要1-5 mol%的金鸡纳生物碱方酸酰胺。