A Convenient Synthesis of 3-Chloro-3,4-dihydro-4-hydroxy-3-nitro-2-phenyl-2H-1-benzopyrans

Article abstract of DOI:10.1055/s-1990-26791

The novel title compounds 5 are prepared by a simple and efficient two-step procedure starting from substituted benzaldehydes 1.A convenient route to the (2-chloro-2-nitroethenyl)benzenes 3 required as intermediates in the synthesis is reported.