Gold(I)-Catalyzed Tandem Alkoxylation/Lactonization of γ-Hydroxy-α,β-Acetylenic Esters
作者:Rubén S. Ramón、Christophe Pottier、Adrián Gómez-Suárez、Steven P. Nolan
DOI:10.1002/adsc.201100115
日期:2011.6
The formation of 4‐alkoxy‐2(5H)‐furanones was achieved via tandemalkoxylation/lactonization of γ‐hydroxy‐α,β‐acetylenic esters catalyzed by 2 mol% of [2,6‐bis(diisopropylphenyl)imidazol‐2‐ylidine]gold bis(trifluoromethanesulfonyl)imidate [Au(IPr)(NTf2)]. The economic and simple procedure was applied to a series of various secondary propargylic alcohols allowing for yields of desired product of up
Ruthenium(II)-Catalyzed Cyclization of Oxabenzonorbornenes with Propargylic Alcohols: Formation of Isochromenes
作者:Karine Villeneuve、William Tam
DOI:10.1002/ejoc.200600836
日期:2006.12
The ruthenium-catalyzed cyclization of a propargylicalcohol with an oxabenzonorbornene in methanol leads to an unanticipated isochromene framework. The catalytic cycle to form this product is believed to go through an oxidative cyclization of the two unsaturated partners with the ruthenium catalyst, followed by β-hydride elimination, tautomerization andhydroruthenation. The ruthenacyclobutane thus
Lucking; Pfaltz, Synlett, 2000, # 9, p. 1261 - 1264
作者:Lucking、Pfaltz
DOI:——
日期:——
Regioselective Pd-catalyzed alkylative lactonizations of 4-hydroxy-2-alkynecarboxylates with organoboronic acids
作者:Chang Ho Oh、Su Jin Park、Jin Hyang Ryu、Arun Kumar Gupta
DOI:10.1016/j.tetlet.2004.07.129
日期:2004.9
The palladium-catalyzed addition of aryl- and alkenylboronic acids to 4-hydroxy-2-alkynecarboxylates and in situ lactonization would constitute a novel methodology for the synthesis of various butenolides with an excellent stereoselectivity and a high control of regioselectivity. (C) 2004 Published by Elsevier Ltd.
Ruthenium-Catalyzed [2 + 2] Cycloadditions between Norbornene and Propargylic Alcohols or Their Derivatives
作者:Gavin C. Tsui、Karine Villeneuve、Emily Carlson、William Tam
DOI:10.1021/om500563h
日期:2014.7.28
Diastereoselective ruthenium-catalyzed [2 + 2] cycloadditions of norbornene and propargylic alcohols or their derivatives were investigated. The cycloadditions were found to be highly stereoselective, giving exo cycloadducts in moderate to excellent yields with diastereoselectivities up to 92:8. When a chiral propargylic alcohol was used in the cycloaddition, up to 80% ee of the [2 + 2] cycloadducts was