Tertiary Alcohols by Tandem β-Carbolithiation and N→C Aryl Migration in Enol Carbamates
作者:Anne M. Fournier、Jonathan Clayden
DOI:10.1021/ol2029355
日期:2012.1.6
Enolcarbamates (O-vinylcarbamates) derivedfrom aromatic or α,β-unsaturated compounds and bearing an N-aryl substituent undergo carbolithiation by nucleophilic attack at the (nominally nucleophilic) β position of the enol double bond. The resulting carbamate-stabilized allylic, propargylic, or benzylic organolithium rearranges with N→C migration of the N-aryl substituent, creating a quaternary carbon
and dioxygen serve as oxidants in highly stereoselective oxidative Pd‐catalyzed Heck arylations in which aryl boronicacids are used to synthesize triarylalkyl‐substituted olefins. The reactions occur under very mild conditions at room temperature. As an example, the threefold sequential arylation of methyl acrylate is the crucial step in the stereoselective synthesis of Z‐Tamoxifen.
One-pot synthesis of diarylalkylcarbinols and substituted derivatives through carbon monoxide insertion reactions into aryllithiums
作者:Arturo A. Vitale、F. Doctorovich、N. Sbarbati Nudelman
DOI:10.1016/0022-328x(87)85117-3
日期:1987.9
atmospheric pressure and −78°C, affords diarylalkylcarbinols in good yields. Alkyl chlorides do not react under similar experimental conditions. This feature makes the reaction particularly useful for the synthesis of alcohols functionalized in the alkyl chain through subsequent reactions of the diaryl(chloro)alkylcarbinols. The procedure can also be adapted to afford substituted cyclic ethers. If the reaction