Evolution of Efficient Strategies for Enone−Alkyne and Enal−Alkyne Reductive Couplings
作者:Wei Li、Ananda Herath、John Montgomery
DOI:10.1021/ja9083607
日期:2009.11.25
Strategies for the reductive coupling of enones or enals with alkynes have been developed. The reducing agents employed include organozincs, organoboranes, organosilanes, and methanol. The latter of these strategies is simple, cost-effective, and tolerant of many functional groups. Isotopic labeling strategies have provided supporting evidence for the mechanistic proposals.
Catalytic Intermolecular Reductive Coupling of Enones and Alkynes
作者:Ananda Herath、Benjamin B. Thompson、John Montgomery
DOI:10.1021/ja073300q
日期:2007.7.1
A nickel-catalyzed intermolecular reductive coupling of enones and alkynes has been developed as a novel entry to gamma,delta-unsaturated ketones. The process does not require formation of a vinyl organometallic, and a variety of functional groups including free hydroxyls and esters are tolerated. A number of features that complement existing copper-mediated processes are highlighted.
Rhodium-catalyzed substitution of allylic carbonates with enoxysilanes
作者:Takako Muraoka、Isamu Matsuda、Kenji Itoh
DOI:10.1016/s0040-4039(00)01448-9
日期:2000.11
Substitution at the allylic position proceeds smoothly in rhodium-catalyzed reactions of allyl carbonates with enoxysilanes under almost neutral conditions to give gamma,delta -unsaturated ketones in good to excellent yields. (C) 2000 Elsevier Science Ltd. All rights reserved.
Conjugate addition of B-alkenyl-9-borabicyclo[3.3.1]nonanes to methyl vinyl ketone. A convenient synthesis of .gamma.,.delta.-unsaturated ketones