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Search results for: epoxidation
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... fermentation of benzoic acid (1) to the 1,2-dihydrodiol, followed by epoxidation, rearrangement and silylation. Acylation of 3 with 2 gave the ketone 4 ...
... of cyclic quaternary centers. Addition of phenylacetylene to cyclopentanone followed by dehydration and Shi epoxidation gave the epoxide 10. Opening of the epoxide with allylmagnesium chloride proceeded with ...
... the epoxide. As epoxy aldehydes such as 6 are readily available by Sharpless asymmetric epoxidation, this should be a general route to enantiomerically-aldol products. The rearrangement also ...
... . An advantage of this approach is that by changing the absolute sense of the epoxidation and/or the dihydroxylation, it should be possible to selectively prepare each ...
... CHIRAL CENTERS/SINGLE ISOMERS E/UNSATURATED-ACIDS/1,1-DIPHENYLPHOSPHOLANIUM PERCHLORATE/STEREOSELECTIVE EPOXIDATION/NUCLEOPHILIC-ATTACK ...
... of the oxidation of 5 to 6 serves as a timely reminder that the widely-used epoxidation reagent dimethyl dioxirane is also useful for the oxidation of secondary alcohols to ketones ...
... Douglass Taber University of Delaware Enantioselective ?-Functionalization of Carbonyl Compounds The enantioselective oxygenation procedures, epoxidation and dihydroxylation, developed by Barry Sharpless have dominated single-enantiomer organic synthesis. Recently ...
... was required to correct the secondary alcohol center. The final challenge was the selective epoxidation of the triene 12. There are two concerns: facial selectivity, and ...
... EFFICIENT PREPARATION/N-SULFONYLIMINES/SULFONIUM YLIDES/ALLYLIC YLIDES/AZIRIDINATION/VINYLAZIRIDINES/EPOXIDATION/IMINES/ESTERS Stereoselective reactions with imines. L. X. Dai ...
... substituted allyl donors, based on alkenyl addition to 10, prepared by Sharpless asymmetric epoxidation. The ee of 12 is the same as the ee of 10. ...
