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The Michael addition of substituted isoxazoles to substituted chalcones and 1,3-dicarbonyl compounds in presence of p-toluenesulfonic acid catalyst supported on KSF-clay proceed very efficiently and furnished the Michael adducts in excellent yields. The Michael adducts underwent reductive cyclization on treatment with SnCl2-MeOH to afford substituted isoxazolo(4,5-b)azepines in high yields.

p-TsOH catalysed KSF solid supported Michael addition with substituted isoxazoles and their reductive cyclisation to isoxazolo[4,5-b]azepines