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- W2035006587 abstract "Abstract A convenient method for the preparation of sydnonyl-substituted α, β-unsaturated ketones, based on Knoevenagel condensation, is presented. Although well known, this reaction has never been utilized in the condensation involving sydnone derivatives. Thus, 3-aryl-4-formylsydnones ( 1 ) are reacted with active methylene compounds such as acetylacetone ( 2a ), ethyl acetoacetate ( 2b ), diethyl malonate ( 2c ), malononitrile ( 4a ), ethyl cyanoacetate ( 4b ) and cyanoacetamide ( 4c ) by modified Knoevenagel condensation to afford multifunctional derivatives. Also, sydnonyl-substituted 1,3-dihydro-indol-2-one derivatives 10 were synthesized successfully by condensing 3-aryl-4-formylsydnones ( 1 ) with oxindoles 9 ." @default.
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- W2035006587 date "2003-06-01" @default.
- W2035006587 modified "2023-09-25" @default.
- W2035006587 title "Access to the syntheses of sydnonyl-substituted α,β-unsaturated ketones and 1,3-dihydro-indol-2-ones by modified Knoevenagel reaction" @default.
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- W2035006587 doi "https://doi.org/10.1016/s0040-4020(03)00574-x" @default.
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