Palladium-Catalyzed Dehydrative Allylation of Hypophosphorous Acid with Allylic Alcohols
作者:Karla Bravo-Altamirano、Jean-Luc Montchamp
DOI:10.1021/ol061828e
日期:2006.8.1
A novel palladium-catalyzedallylation of H3PO2 with allylicalcohols is described. The phosphorus-carbon bond-forming reaction produces allylic-H-phosphinic acids and water, in the absence of additives. Primary H-phosphinic acids are obtained in excellent yields, whereas secondary H-phosphinic acids react sluggishly. A reusable polymer-supported catalyst is also described. The reaction provides an
Palladium-catalyzed phosphorus–carbon bond formation: cross-coupling reactions of alkyl phosphinates with aryl, heteroaryl, alkenyl, benzylic, and allylic halides and triflates
palladium catalysis. This full paper examines the scope and some mechanistic aspects of this phosphorus–carbon bond forming reaction. The reactions of alkenyl and allylichalides are also described for the first time. This novel cross-coupling provides a convenient access to a variety of substituted H-phosphinates.
作者:Patrice Ribière、Karla Bravo-Altamirano、Monika I. Antczak、Jennifer D. Hawkins、Jean-Luc Montchamp
DOI:10.1021/jo050096l
日期:2005.5.1
A new nickel-based catalytic system has been developed for phosphorus-carbon bond formation. The addition of alkyl phosphinates to alkynes is catalyzed by nickel chloride in the absence of added ligand. The reaction generally proceeds in high yields, even with internal alkynes, which were poor substrates in our previously reported palladium-catalyzed hydrophosphinylation of alkyl phosphinates. The method is useful for the preparation of H-phosphinate esters and their derivatives. The one-pot synthesis of various important organophosphorus compounds is also demonstrated. The reaction can be conducted with microwave heating.