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- W2317192008 startingPage "411" @default.
- W2317192008 abstract "A simple, straightforward, and highly efficient multicomponent one-pot synthesis of a pharmaceutically interesting diverse kind of functionalized 2-amino-3-cyano-4H-pyrans and pyran-annulated heterocycles has been developed based on a low-cost and environmentally benign commercially available urea as a novel organo-catalyst. The reaction occurs via tandem Knoevenagel–cyclocondensation of aldehydes, malononitrile, and C–H-activated acidic compounds in aqueous ethanol at room temperature. Following this protocol, it was possible to synthesize 2-amino-3-cyano-pyrano[3,2-c]chromen-5(4H)-ones (4aa–4al), 2-amino-3-cyano-pyrano[4,3-b]pyran-5(4H)-ones (4ba–4be), 2-amino-3-cyano-7,8-dihydro-4H-chromen-5(6H)-one (4ca–4cr), 1H-pyrano[2,3-d]pyrimidine-2,4(3H,5H)-diones (4da–4dd), 2-amino-3-cyano-5,10-dioxo-5,10-dihydro-4H-benzo[g]chromenes (4ea–4ec), 2-amino-3-cyano-4H-pyrans (4fa–4fh), and 1,4-dihydropyrano[2,3-c]pyrazoles (4ga–4gb). The salient features of the present protocol are mild reaction conditions, excellen..." @default.
- W2317192008 created "2016-06-24" @default.
- W2317192008 creator A5048681449 @default.
- W2317192008 creator A5054314965 @default.
- W2317192008 date "2013-11-19" @default.
- W2317192008 modified "2023-10-18" @default.
- W2317192008 title "Facile and One-Pot Access to Diverse and Densely Functionalized 2-Amino-3-cyano-4<i>H</i>-pyrans and Pyran-Annulated Heterocyclic Scaffolds via an Eco-Friendly Multicomponent Reaction at Room Temperature Using Urea as a Novel Organo-Catalyst" @default.
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