Terazosin hydrochloride dihydrate was synthesized from 6,7 dimethoxy 1 H,3H quinazolin 2,4 dione via chlorination, amination, condensation and salt formation in an overall yield of 64.3%.

• 以 6 ；7-二甲氧基 - 1H；3H-喹唑啉 - 2 ；4-二酮为原料 ；经氯化、氨化、缩合、成盐制得盐酸特拉唑嗪 ；总收率6 4.；3%25。