Preparation method of ambroxol hydrochloride impurity F

The invention provides a preparation method of an ambroxol hydrochloride impurity F. The ambroxol hydrochloride impurity F is prepared by a condensation reaction, and the chemical equation is shown in the specification. The method is simple to operate and high in yield. No special equipment is needed, and reaction conditions are mild. 本发明提供了一种盐酸氨溴索杂质F的制备方法，其具体为采用缩合反应制备得到，所述化学反应方程式为：本方法操作简单，收率高。无需特殊设备，反应条件温和。