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- W2020372218 abstract "Pyrazolo[1,5-a]pyridines (3) and pyrano[4,3-d]pyrazolo[1,5-a]pyridines (4) have been synthesized from the reaction of pyran-2-one (1) and 5-aryl-3-cyanomethyl-1H-pyrazole (2) through carbanion-induced ring transformation reactions. A regioselective synthesis of highly functionalized polysubstituted pyrazolo[1,5-a]pyridines (6, 7) has also been achieved from the reaction of 2 with polarised ketene dithioacetals (5) and arylidenemalononitrile, respectively. An analogous reaction of 1 with 2-cyanomethyl-1H-benzimidazole (8) has also afforded the fused heterocycles 9 and 10. The cyano function in 9 has been exploited for acid-catalysed cyclization with thiosemicarbazide to obtain 11 in high yield." @default.
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- W2020372218 date "1998-10-01" @default.
- W2020372218 modified "2023-10-17" @default.
- W2020372218 title "An Expeditious Synthesis of Heteroarenes through Carbanion-Induced Ring Transformation Reactions of Suitable Functionalized Pyran-2-ones" @default.
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- W2020372218 doi "https://doi.org/10.1002/(sici)1099-0690(199810)1998:10<2083::aid-ejoc2083>3.0.co;2-b" @default.
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