Synthesis of novel 2H-chromene-3-carboxylate isoxazole/isoxazoline derivatives via 1,3-dipolar cycloaddition reaction (NOAC)

Abstract

Synthesis of novel (3-phenylisoxazol-5-yl)methyl-2H-chromene-3-carboxylates (7a–7d) and (3-phenyl-4,5-dihydroisoxazol-5-yl)methyl-2H-chromene-3-carboxylates (8a–8p) by 1,3-dipolar cycloaddition, and nitrile oxide and alkyne cycloaddition (NOAC) is presented. The products are characterised by IR, ¹H and ¹³C NMR, and ESI-MS data.