Abstract
A new class of spiroheterocycles—pyrazolinyl thienofuranones and isoxazolinyl thienofuranones were prepared from heteroarylmethylene thienofuranones exploiting 1,3-dipolar cycloaddition of nitrile imines and nitrile oxides generated from araldehyde phenylhydrazones and araldoximes under green conditions using iodosobenzene and cetyltrimethylammonium bromide as surfactant. All the compounds are tested for their antimicrobial activity. Pyridine substituted pyrazolinyl and isoxazolinyl thienofuranones displayed prominent antibacterial activity against Bacillus subtilis and antifungal activity against Aspergillus niger greater than the standard drug chloramphenicol and ketoconazole.
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