Levocetirizine Dihydrochloride was prepared from benzoyl chloride by acidylation,hydrogenation,cyclization with an overall yield of 8.05%.

• 以苯甲酰氯为原料；经酰化；还原；环合等反应合成左旋西替利嗪盐酸盐；反应总收率为8.；05%25。