Copper(I) iodide dimethyl sulfide catalyzed 1,4-addition of alkenyl groups from alkenyl-alkylzincate reagents
作者:Amer El-Batta、Mikael Bergdahl
DOI:10.1016/j.tetlet.2007.01.041
日期:2007.3
presence of catalyticquantities of the copper(I) iodide dimethyl sulfide complex (CuI)4(SMe2)3} with alkenyl-alkylzincate reagents allows for the complete chemoselective 1,4-addition of various alkenyl groups to a number of α,β-unsaturated carbonyl compounds in CH2Cl2 at +35 °C. The 1,4-addition of the mixed vinylzincate reagent is more efficient than the corresponding vinylzirconocene reagent in CH2Cl2
Direct Copper(I) Iodide Dimethyl Sulfide Catalyzed Conjugate Addition of Alkenyl Groups from Vinylzirconocene Reagents
作者:Amer El-Batta、Taleb R. Hage、Steve Plotkin、Mikael Bergdahl
DOI:10.1021/ol036141y
日期:2004.1.1
text] CuI.0.75DMS complex is an excellent catalyst for the direct conjugate addition of alkenyl groups from vinylzirconocene reagents to alpha,beta-unsaturated aldehydes and ketones. The presence of the catalyst with an alkenylzirconocene, at +40 degrees C in THF, circumvents the need for making discrete alkenylcopper reagents. The catalyst is superior in terms of product yields and alkene flexibility
Rhodium-Catalyzed Hydrosilylation of Internal Alkynes with Silane Reagents bearing Heteroatom Substituents. Studies on the Regio-/Stereochemistry and Transformation of the Produced Alkenylsilanes by Rhodium-Catalyzed Conjugate Addition
作者:Tomoyuki Sanada、Tsuyoshi Kato、Makoto Mitani、Atsunori Mori
DOI:10.1002/adsc.200505289
日期:2006.1
2-disubstituted alkenylsilanes. The obtained alkenylsilane was subjected to reaction with α,β-unsaturated carbonyl compounds in the presence of a rhodium catalyst to undergo conjugate addition. One-pot hydrosilylation-conjugate addition with a rhodium catalyst was also performed.
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.