Using 4-chloro salicylic acid as starting material, through novel method, via esterification, etherification, hydrolysis, cyclization, bromination to give the product.

• 从4氯水杨酸开始,运用新颖的方法,经过酯化、成醚、水解、闭环、溴代5步化学反应得到产物,总收率19%25。