Epoxidation of bromoallenes connects red algae metabolites by an intersecting bromoallene oxide – Favorskii manifold
作者:D. Christopher Braddock、James Clarke、Henry S. Rzepa
DOI:10.1039/c3cc46720a
日期:——
DMDO epoxidation of bromoallenes gives directly α,β-unsaturated carboxylic acids under the reaction conditions. Calculated (ÏB97XD/6-311G(d,p)/SCRF = acetone) potential energy surfaces and 2H- and 13C-labeling experiments are consistent with bromoallene oxide intermediates which spontaneously rearrange via a bromocyclopropanone in an intersecting bromoallene oxide â Favorskii manifold.
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.