Nickel-Catalyzed Homo- and Cross-Coupling of Allyl Alcohols via Allyl Boronates
作者:Yi Gan、Hui Hu、Yuanhong Liu
DOI:10.1021/acs.orglett.0c01424
日期:2020.6.5
allylic alcohols to 1,5-dienes in the presence of B2pin2 with excellent regioselectivity has been developed. Mechanistic studies indicate that the reaction proceeds via sequential nickel-catalyzed borylation of allylalcohols followed by cross-coupling of the resulting allyl boronates with allylalcohols. The method was effectively applied to nickel-catalyzed allylation of aldehydes using allylic alcohols
cinnamyl halides also showed good diastereoselectivity favoring the anti-product. Mechanistic studies using proton NMR techniques suggested that the additive (i.e., CuCl2, TiCl3, PdCl2) could accelerate the formation of allyltin intermediate, but this step was shown not to be the most important for the allylation. Thus we proposed that the Lewis acid catalysis effect exerted by the additive was the main
Iridium-Catalyzed Coupling Reaction of Primary Alcohols with 1-Aryl-1-propynes Leading to Secondary Homoallylic Alcohols
作者:Yasushi Obora、Shintaro Hatanaka、Yasutaka Ishii
DOI:10.1021/ol901366q
日期:2009.8.6
We report iridium-catalyzedcoupling of 2-alkynes such as 1-aryl-1-propynes with primaryalcoholsleading to secondary homoallylic alcohols as products. This reaction involves an iridium-catalyzed novel catalytic transformation of 2-alkynes and primaryalcohols through the formation of hydrido(π-allyl)iridium as a possible key intermediate.