m-CPBA/KOH: An Efficient Reagent for Nucleophilic Epoxidation of gem-Deactivated Olefins
摘要:
The m-chloroperoxybenzoate anion (generated from m-CPBA and bases such as K2CO3 or KOH) is a highly efficient nucleophilic epoxidating reagent for strongly deactivated olefins containing two electron-withdrawing groups at the same carbon, under mild conditions which affect neither other double bonds nor electrophilic oxidizable centers such as sulfoxides.
Synthesis of alkyl 4-(diethoxymethyl)-3-pyridin-3-ylisoxazole-5-carboxylates: useful scaffold for highly functionalised 3-(pyridin-3-yl)isoxazoles
摘要:
The methyl 4-(diethoxymethyl)-3-(pyridin-3-yl)isoxazole-5-carboxylate obtained by domino 1,3-dipolar cycloaddition and elimination starting of pyridine-3-nitrile oxide and methyl 4,4-diethoxy-3-p-tolylsulfinylbut-2-enoate is a convenient scaffold for the synthesis of other new highly functionalised 3-pyridin-3-ylisoxazoles-5-carboxylic acid derivatives and isoxazole-annulated heterocycles. (c) 2005 Elsevier Ltd. All rights reserved.