Highly tunable arylated cinchona alkaloids as bifunctional catalysts
作者:Cormac Quigley、Zaida Rodríguez-Docampo、Stephen J. Connon
DOI:10.1039/c1cc14684j
日期:——
We report the design and evaluation of a library of chiral bifunctional organocatalysts in which the distance between the catalytically active units can be systematically varied.
我们报道了一种手性双功能有机催化剂库的设计与评估,其中催化活性单元之间的距离可以系统地变化。
Enantioselective synthesis of 1,2,4-triazolines catalyzed by a cinchona alkaloid-derived organocatalyst
作者:Qian Shao、Jiean Chen、Meihua Tu、David W. Piotrowski、Yong Huang
DOI:10.1039/c3cc46757k
日期:——
enantioselective organocatalytic process for the one-step synthesis of poly-substituted 1,2,4-triazolines is reported. The heterocycle formation is believed to go through a step-wise mechanism of nucleophilic addition of an azlactone to an azodicarboxylate in the presence of an organic base catalyst, followed by a TMSCHN2 mediated heterocyclization. Both theoretical calculations and experimental evidence suggest