Synthesis of 7a-phenyl-1a,7a-dihydro-benzopyrano[2,3-b]azirin-7-ones via photoisomerization reaction

Abstract

An environmentally friendly and novel protocol has been developed for the synthesis of 7<italic>a</italic>-phenyl-1<italic>a</italic>,7<italic>a</italic>-phenyl-benzopyrano[2,3-<italic>b</italic>]azirin-7-ones in moderate to high yields<italic>via</italic>the photoisomerization of 4-phenyl-5-(2-hydroxyphenyl)isoxazoles.