Cinchona alkaloid phase-transfer catalysts revisited: influence of substituted aryl groups on the enantioselectivity of glycine ester enolate alkylation
摘要:
We report herein, the influence of substituted aryl groups in quaternary ammonium salts derived from cinchona alkaloids on enantioselectivity of the alkylation of glycine ester enolates. (c) 2005 Elsevier Ltd. All rights reserved.
Syntheses of Ladder-Type Oligonaphthalene Derivatives and Their Photophysical and Electrochemical Properties
作者:Jun-Chun Chen、Tse-Shi Lee、Chih-Hsiu Lin
DOI:10.1002/chem.200700830
日期:2008.3.17
Ladder-type oligophenylene derivatives are important compounds for light-emitting devices. However, the closely related ladder-type oligonaphthalene derivatives have received little attention due to the lack of synthetic accessibility. We hereby report the syntheses of these novel conjugated systems by means of an intramolecular cationic cyclization protocol. Utilizing a one-pot-multiple-component