Method of making benzazoles

Abstract

This present invention provides a method of making benzazoles comprising a process of making aryl or alkyl benzazoles from corresponding aryl acid chlorides or alkyl acid chlorides without applying hazard condensing agent. The benzazole compounds described in this invention have following formula I: Wherein: n is an integer of from 3 to 8; Z is O, NR or S; and R and R′ are individually hydrogen; alkyl of from 1 to 24 carbon atoms, for example, propyl, t-butyl, heptyl, and the like; aryl or hetero-atom substituted aryl of from 5 to 20 carbon atoms, for example, phenyl and naphthyl, furyl, thienyl, pyridyl, quinolinyl and other heterocyclic systems; or halo such as chloro, fluoro, bromo, cyano; or atoms necessary to complete a fused aromatic ring; and B is a linkage unit consisting of alkyl, aryl, substituted alkyl, or substituted aryl which conjugately or unconjugately connects the multiple benzazoles together.

Dependencies are inferred from the claim text.