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- W2009726407 abstract "1,4-Disubstituted 5-hydroxy-1H-pyrazoles (9), (12), and (13) were prepared in two steps from hydrazines (2a-k) and 3-(dimethylamino)propenoates (1), (4), and (5). First, acid-catalyzed treatment of enaminones (1), (4), and (5) with (hetero)arylhydrazines (2a-k) afforded the corresponding dimethylamine substitution products, hydrazones (3') and enehydrazines (6) and (7). Under acidic conditions, intermediates (3'), (6), and (7) did not undergo cyclization into the pyrazole derivatives. However, heating 3', 6, and 7 in a mixture of methanol and triethylamine furnished the desired products in 65-98% yields." @default.
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- W2009726407 date "2006-01-01" @default.
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- W2009726407 title "3-(Dimethylamino)propenoate-based Regioselective Synthesis of 1,4-Disubstituted 5-Hydroxy-1H-pyrazoles" @default.
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- W2009726407 doi "https://doi.org/10.3987/com-06-10682" @default.
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