Synthesis of 3-phenylpyrazoles from 2-alkenyl-5-phenytetrazoles
Abstract
2-Alkenyl-5-phenyltetrazoles 7a–e are readily converted by thermolysis or photolysis into 3-phenylpyrazoles 11a–e in good to excellent yield (Table 2). The alkenyltetrazoles 7 are prepared by direct or indirect dehydration of the alcohols 5 formed by quenching α-lithioalkyltetrazoles with aldehydes.