Intermolecular tandem copper-catalyzed O-arylation-oxidative acylation (cross dehydrogenative coupling-CDC) has been developed under air as an oxidant. The reaction between 2,4-dihydro-3H-pyrazol-3-ones and ortho-halo aryl carboxaldehydes furnished the corresponding chromone fused pyrazoles, in a straightforward manner. The synthetic utility of the presented tandem catalysis has been demonstrated with the synthesis of an A(2)-subtype selective adenosine receptor antagonist in only two steps.[GRAPHICS]
Heterocyclic analogs of xanthones
作者:A. S. Sarenko、I. Ya. Kvitko、L. S. �fros
DOI:10.1007/bf00487468
日期:1972.6
Heterocyclic analogs of xanthones chromono(3,2-d)pyrazoles