Quino[1,2-<i>c</i>]quinazolines. II. Synthesis of 12,13-dihydro-11<i>b</i><i>H</i>-quino-[1,2-<i>c</i>]quinazolines<i>via</i>the versatile intermediates 2-(2-amino-4,5-dimethoxyphenyl)-6,7-disubstituted-1,2,3,4-tetrahydroquinolines
作者:Steven D. Phillips、Raymond N. Castle
DOI:10.1002/jhet.5570170805
日期:1980.12
versatile intermediates 2-(2-amino-4,5-dimethoxyphenyl)-6,7-dimethoxy-1,2,3,4-tetrahydroquinoline (2a) and 6-(2-amino-4,5-dimethoxyphenyl)-5,6,7,8-tetrahydro[1,3]dioxolo[4,5-g]quinoline (2b) were used in the preparation of a wide variety of 12,13-dihydro-11bH-quino[1,2-c]quinazolines by reaction with triethyl orthoformate, cyanogen bromide, urea and carbon disulfide in pyridine. Reaction of the thio
通用中间体2-(2-氨基-4,5-二甲氧基苯基)-6,7-二甲氧基-1,2,3,4-四氢喹啉(2a)和6-(2-氨基-4,5-二甲氧基苯基)- 5,6,7,8-四氢- [1,3]二氧杂环戊烯并[4,5-克]喹啉(2B)中的各种各样的12,13-二氢-11-的制备中使用b ħ -quino [1,2 2- c ]喹唑啉与原甲酸三乙酯,溴化氰,尿素和二硫化碳在吡啶中反应。硫和酮产物分别与甲基碘和氯氧化磷反应,得到所需的甲硫基和氯代衍生物。当中间体2a,b发生新的Reissert型反应使它们与乙酸酐或苯甲酰氯反应。12,13-二氢2,3,9,10-四甲氧基11的企图脱氢b ħ -quino [1,2 Ç ]喹唑啉(3a中还报道)。