Ligand dependence of molybdenum-catalyzed alkylations. Molybdenum-isonitrile complexes as a new class of highly reactive alkylation catalysts
作者:Barry M. Trost、Craig A. Merlic
DOI:10.1021/ja00182a018
日期:1990.12
generates the most effective molybdenum catalysts known to date. The reactive catalyst proved to be Mo(RNC) 4 (CO) 2 . With this new catalyst, a much broader range of substrates can be employed including many that failed or reacted very poorly by using molybdenumhexacarbonyl. The regioselectivity also differs from that obtained with molybdenumhexacarbonyl. The stereochemistry of the reaction proceeds with
Cobalt-Catalyzed Diastereo- and Enantioselective Reductive Allyl Additions to Aldehydes with Allylic Alcohol Derivatives via Allyl Radical Intermediates
enantioenriched homoallylic alcohols with a remarkably broad scope of allyl groups that can be introduced. Mechanistic studies indicated that allyl radical intermediates were involved in this process. These new discoveries establish a new strategy for development of enantioselective transformations through capture of radicals by chiral Co complexes, pushing forward the frontier of Co complexes for enantioselective
Palladium-catalyzed allylic substitution on solid support
作者:Lutz F. Tietze、Thomas Hippe、Adrian Steinmetz
DOI:10.1039/a707670c
日期:——
Different polymer-bound 1,3-dicarbonyl compounds react as nucleophiles in Pd-catalyzed allylic substitutions on solid support with a variety of allylic acetates, chlorides and carbonates.