Dinitrogen oxide was employed as a clean oxidant for various oxidations in the presence of a catalytic amount of dioxoruthenium tetramesitylporphyrin complex (Ru(tmo)(O) 2 ). A variety of olefins, secondary alcohols, and benzyl alcohols were smoothly oxidized to the corresponding epoxides, ketones, and aldehydes in high yields. In the oxidation of 9,10-dihydroanthracene derivatives, the competitive
β-Selective Epoxidation of Cholesterol Derivatives with Molecular Oxygen and Aldehyde Catalyzed by Manganese(II) Complex
作者:Tohru Yamada、Kiyomi Imagawa、Teruaki Mukaiyama
DOI:10.1246/cl.1992.2109
日期:1992.11
In the presence of a catalytic amount of bis(dipivaloylmethanato)manganese(II) (= Mn(dpm)2), various cholesterol derivatives are smoothly converted into the corresponding β-epoxides in good to high yields with combined use of molecular oxygen and isobutyraldehyde. These stereoselectivities are the reversal of the cases using peracid such as mCPBA.
Molybdenum Catalyzed β-Selective Epoxidation of Cholesterol Esters with Molecular Oxygen<sup>+</sup>
作者:M. Lakshmi Kantam、P. Lakshmi Santhi
DOI:10.1080/00397919408020771
日期:1994.4
Molybdenyl(VI) acetylacetonate catalyses the conversion of various cholesterol esters into the corresponding beta-epoxides in good yields with the combined use of molecular oxygen and i-butyraldehyde at room temperature.
MARCHON, JEAN-CLAUDE;RAMASSEUL, RENE, SYNTHESIS,(1989) N, C. 389-391