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An extension of the ‘Cusmano–Ruccia’ reaction is reported. 6-(4-chlorophenyl)-3-methyl-5-nitrosoimidazo[2,1-b]oxazole by the action of hydrochloric acid gives 3-(4-chlorobenzoyl)-5-methyl-1,2,4-oxadiazole (13); presumably via ammonium ion, CO 2 and methanol elimination. The relevance of the nature of the atom of the B-ring linked to C-2 of the imidazole for the occurrence of the ring-into-ring...
A new class of compounds analogues of geiparvarin is described: aldolic condensation of 3(2H)-furanones and 7-(2-oxoethoxy)coumarins followed by a very efficient dehydration protocol led to the title compounds which show good antitumoral activity against several human cell lines.
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