THE CORRECT SYNTHESIS OF 2,3-DIHYDRO-2-ARYL-4-R-BENZOPYRANOPYRAZOLE-3-ONES.

DOI: 10.1016/S0040-4039(00)95618-1

Source and publish data:

Tetrahedron Letters p. 5165 - 5168 (1987)

Update date:2022-08-02

Topics:

Authors:

Colotta, Vittoria

Cecchi, Lucia

Melani, Fabrizio

Palazzino, Giovanna

Filacchioni, Guido

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Article abstract of DOI:10.1016/S0040-4039(00)95618-1

The correct synthesis of the title compounds 1a-b and 2a-b is described.The claimed synthesis of 2a from 2-methyl-3-chromonecarbonitrile is shown not to lead to 2a, as previously reported but to 1,4-dihydro-1-phenyl-3-methyl<1>benzopyrano<3,4-d>pyrazole-4

Full text of DOI:10.1016/S0040-4039(00)95618-1

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