Synthesis of new alkoxy/sulfonate-substituted carbene precursors derived from [2.2]paracyclophane and their application in the asymmetric arylation of aldehydes
摘要:
A series of novel planar chiral alkoxy/sulfonate-substituted carbene precursors have been designed and synthesized. They were used as N-heterocyclic carbene ligands in the Rh-catalyzed asymmetric addition of arylboronic acids to aromatic aldehydes, affording chiral diarylmethanols with high yields and moderate enantioselectivities. (C) 2012 Elsevier Ltd. All rights reserved.
An Efficient Catalyst System for Pd-Catalyzed Amination of [2.2]Paracyclophanyl Bromides
摘要:
A practical Buchwald-Hartwig amination of [2.2]paracyclophanyl bromides with benzhydrylideneamine is developed. The method provides a Facile route to a variety of imino and amino [2.2]paracyclophanes that are otherwise not readily synthesized.
Imidazolinium salts derived from amino[2.2]paracyclophane compounds: synthesis and hydrolytic ring-opening
作者:Kerry-Ann Green、Paul T. Maragh、Kamaluddin Abdur-Rashid、Alan J. Lough、Tara P. Dasgupta
DOI:10.1016/j.tetlet.2014.07.044
日期:2014.9
The synthesis of a series of imidazolinium chlorides containing the [2.2]paracyclophane scaffold is described. Attempts to deprotonate the salts with strong bases resulted in hydrolytic ring-opening and yielded N-formylethylenediamine products rather than the intended free carbenes.