反应详情

In step 1 of Scheme C, bromophenol n undergoes iodination to form bromo-iodo-phenol o. Phenol compound o is then reacted with cinnamoyl halide p in step 2 to afford phenoxy ester compound g. Compound g undergoes a cyclization in step 3 to form benzofuran compound r. In step 4 compound r is reacted with dimethyl formamide in the presence of phosphorus oxychloride to afford benzofuran-2-carboxaldehyde s. Aldehyde compound s is converted to cyano-benzofuran compound t in step 5 by reaction with aqueous ammonia. In step 6 a Buchwald reaction is carried out by reacting compound t with piperazine compound f to afford piperazinyl benzofuran u. The nitrile group of compound u undergoes oxidation in step 7 to give benzofuran carboxamide compound v. Compound v is then deprotected in step 8 to afford compound w, which is a compound of formula II in accordance with the invention.

1. customIn step 6 a Buchwald reaction