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Search results for: epoxidation

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... following reaction was. What we ' ve got here is a neat, selective epoxidation of an alkene and rearrangement of the allylic system to give a dihydropyran ring ...
URL: https://www.organic-chemistry.org/totalsynthesis/totsyn05/platensimycin-njardarson.shtm
... geometric control. The two stereogenic centers of 2 were then established by Sharpless asymmetric epoxidation. The preparation of the cyclohexene 1 began with pulegone 8, available commercially ...
URL: https://www.organic-chemistry.org/Highlights/2004/03May.shtm
... the diene. Methanolysis followed by oxidation then gave the triketone 1, which on epoxidation with MCPBA gave 2 as the minor component of a 3:1 mixture ...
URL: https://www.organic-chemistry.org/Highlights/2004/05April.shtm
... combination with sodium formate served effectively to regenerate the NADH. Using this combination, epoxidation of aryl alkenes such as 6, 8 and 10 proceeded in high enantiomeric ...
URL: https://www.organic-chemistry.org/Highlights/2004/10May.shtm
... +2 cycloaddition of singlet oxygen with substituted 1,3-butadienes, with a further epoxidation required to mimic the artemisinin (1a) 1,2,4-trioxane ring ...
URL: https://www.organic-chemistry.org/Highlights/2004/25OctoberA.shtm
... 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 ...
URL: https://www.organic-chemistry.org/Highlights/2005/07November.shtm
... 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 ...
URL: https://www.organic-chemistry.org/Highlights/2005/08August.shtm
... 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 ...
URL: https://www.organic-chemistry.org/Highlights/2005/14February.shtm
... . 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 ...
URL: https://www.organic-chemistry.org/Highlights/2005/16May.shtm
... 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 ...
URL: https://www.organic-chemistry.org/Highlights/2005/19September.shtm
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