Add time:07/12/2019         Source:sciencedirect.com

An efficient metal-free cascade reaction to synthesize novel pyrimido[1,2-b]indazole-3-carbonitrile derivatives was reported. The reaction starts from aromatic aldehydes, 1H-indazol-3-amine (4-chloro-1H-indazol-3-amine), and 3-(1H-indol-3-yl)-3-oxopropanenitrile or 3-oxo-3-arylpro-panenitrile in the presence of ethanol and triethylamine under plain laboratory conditions. The reaction was easy to operate with good tolerance to substrates in high yield.

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