Sone, Toshihiko published the artcileEnantioselective synthesis of 2,2-disubstituted terminal epoxides via catalytic asymmetric Corey-Chaykovsky epoxidation of ketones, Recommanded Product: trimethyloxosulphonium chloride, the publication is Molecules (2012), 1617-1634, database is CAplus and MEDLINE.
Catalytic asym. Corey-Chaykovsky epoxidation of various ketones RCOR1 (R = Ph, 1-naphthyl, n-octyl, etc., R1 = Me; R = Ph, 4-ClC6H4, 3-pyridyl, etc., R1 = ET, n-Pr, CHMe2) with dimethyloxosulfonium methylide using a heterobimetallic La-Li3-BINOL complex (LLB) is described. The reaction proceeded smoothly at room temperature in the presence of achiral phosphine oxide additives, and 2,2-disubstituted terminal epoxides I were obtained in high enantioselectivity (97%-91% ee) and yield (>99%-88%) from a broad range of Me ketones with 1-5 mol% catalyst loading. Enantioselectivity was strongly dependent on the steric hindrance, and other ketones, such as Et ketones and Pr ketones resulted in slightly lower enantioselectivity (88%-67% ee).
Molecules published new progress about 5034-06-0. 5034-06-0 belongs to chlorides-buliding-blocks, auxiliary class Salt,Aliphatic hydrocarbon chain, name is trimethyloxosulphonium chloride, and the molecular formula is C6H8N2, Recommanded Product: trimethyloxosulphonium chloride.
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