Anaerobic Nitroxide-Catalyzed Oxidation of Alcohols Using the NO<sup>+</sup>/NO· Redox Pair
作者:Martin Holan、Ullrich Jahn
DOI:10.1021/ol403016p
日期:2014.1.3
A newmethod for alcoholoxidationusing TEMPO or AZADO in conjunction with BF3·OEt2 or LiBF4 as precatalysts and tert-butyl nitrite as a stoichiometric oxidant has been developed. The system is based on a NO+/NO· pair for nitroxide reoxidation under anaerobic conditions. This allows the simple, high-yielding conversion of various achiral and chiral alcohols to carbonyl compounds without epimerization
δ-Sultone Formation Through Rh-Catalyzed C−H Insertion
作者:Scott A. Wolckenhauer、A. Sloan Devlin、J. Du Bois
DOI:10.1021/ol701950d
日期:2007.10.1
Rhodium-catalyzed reactions of sulfonate ester derivatives are biased strongly toward 1,6-insertion and thus offer a general method for assembling delta-sultones. Two protocols for staging this cyclization reaction are described, which capitalize on the unique ability of either diazo or iodonium ylide intermediates to form Rh-carbene species. The value of these heterocycles for fine chemicals synthesis