作者:Wolf-Diethard Pfeiffer、Anja Bodtke、Jana Mücke、Annemarie Hetzheim、Pavel Pazdera
DOI:10.1002/jhet.5570360536
日期:1999.9
The preparation of 1,2,4-triazolo[1,5-c]quinazolines 4a-d, 5, 8a-d by cyclocondensation of 1a-c with carboxylic acids and carboxylic anhydrides, respectively, is described. By different pathways, the 5-thioxo-5,6-dihydro-1,2,4-triazolo[1,5-c]quinazolines 4a-d react with hydrazine hydrate or amines with the formation of 5-substituted 1,2,4-triazolo[1,5-c]quinazolines 9 and 10a-d. Cyclocondensation of
1,2,4-三唑并[1,5的制备Ç ]喹唑啉图4a-d ,5,图8a-d通过的环化缩合1A-1C与羧酸和羧酸酐,分别进行说明。5-thioxo-5,6-dihydro-1,2,4-triazolo [1,5- c ] quinazolines 4a-d与肼水合物或胺反应生成5-取代的1,2, 4-三唑并[1,5- c ]喹唑啉9和10a-d。分别与羧酸,羧酸酐和亚硝酸进行9的环缩合,生成新的双环杂环双-1,2,4-三唑[4,3- a:1,5- c ]喹唑啉13和四唑并[1,5- a ] -1,2,4-三唑并[1,5- c ]喹唑啉(14)。