Highly regioselective control of 1,2-addition of organolithiums to α,β-unsaturated compounds promoted by lithium bromide in 2-methyltetrahydrofuran: a facile and eco-friendly access to allylic alcohols and amines
作者:Vittorio Pace、Laura Castoldi、Pilar Hoyos、José Vicente Sinisterra、Massimo Pregnolato、José Ma Sánchez-Montero
DOI:10.1016/j.tet.2011.01.067
日期:2011.4
Very high regioselective 1,2-addition of organolithiums to alpha,beta-unsaturated carbonyl-like compounds (ketones, aldehydes, and imines) in the presence of LiBr was achieved by carrying out reactions in the sustainable solvent 2-methyltetrahydrofuran. Excellent yields (in isolated product) of allylic alcohols and allylic amines were recovered under a simple experimental procedure at 0 degrees C. (C) 2011 Elsevier Ltd. All rights reserved.
Mild and Tunable Benzoic Acid Catalysts for Rearrangement Reactions of Allylic Alcohols
作者:J. Adam McCubbin、Samantha Voth、Oleg V. Krokhin
DOI:10.1021/jo201540p
日期:2011.10.21
An efficient and simple catalytic method for the isomerization of readily prepared allylic alcohols is described. We focus particularly on cyclic examples and the synthesis of unusual enyne and dienols. The benzoic acid catalysts employed are commercially available and very inexpensive and can be tuned for reactivity and substrate sensitivity.