Br+-induced cyclization of γ,δ-unsaturated ketones: A new approach to bromopyrane derivatives
摘要:
3,5-dibromo-3,4-dihydro-2,2-dimethyl-(2H)-pyrans 2, are obtained through a simple and new procedure involving a bromoenol-etherification of gamma,delta-unsaturated ketones 1; the key step is the formation of mono-bromopyran intermediate A.
3,5-dibromo-3,4-dihydro-2,2-dimethyl-(2H)-pyrans 2, are obtained through a simple and new procedure involving a bromoenol-etherification of gamma,delta-unsaturated ketones 1; the key step is the formation of mono-bromopyran intermediate A.