Enol Silyl Ethers via Copper(II)-Catalyzed C–O Bond Formation
作者:Daniel G. Chan、David J. Winternheimer、Craig A. Merlic
DOI:10.1021/ol2009297
日期:2011.5.20
Copper(II) acetate catalyzes the coupling of pinacol vinylboronates with silanols producing enol silyl ethers. This represents a novel enol silyl ether synthesis via formation of the C–O bond instead of the conventional Si–O bond. This also constitutes the first transition-metal-catalyzed oxidative cross-coupling with silanols.
Alkoxydienes via Copper-Promoted Couplings: Utilizing an Alkyne Effect
作者:David J. Winternheimer、Craig A. Merlic
DOI:10.1021/ol100707s
日期:2010.6.4
copper-based coupling (modern Ullmann) reactions. This enabled syntheses of various alkoxydienes with removable protecting groups that are valuable substrates for Diels−Alder reactions from alcohols and vinyl boronate esters. In addition to demonstrating that 3-hexyne is a ligand for copper in both stoichiometric and catalytic reactions, the reaction atmosphere was found to play a critical role.