Cyclization Reactions of Chloro-Substituted 2-Azoniaallene Salts with Bifunctional Nucleophiles
作者:Atef Hamed
DOI:10.1055/s-1992-26171
日期:——
The multifunctional electrophilic chloro-substituted 2-azoniaallene salts 3-5 react with bifunctional nucleophiles under cyclization to furnish heterocycles. Preparations of the 1,2,3,4-tetrahydro-1,3-dimethyl-2,4-dioxopyrimido[4,5-d]pyrimidines 7a,b, 10a,b, 14, 17a,b, and the 5,6,7,8-tetrahydro-6,8-dimethyl-5,7-dioxopyrimido[5,4-e]-1,3-oxazin-1-ium salts 9a,b, 15, first representatives of a new ring system, are reported. Furthermore, the 2,3-dihydro-1,3-dimethyl-4-(methylthio)-2-oxo-1,3,5-triazinium salts 11d,e, 13, and 3-(dimethylamino)-4, 5-dihydro-5-oxo-2-(2,4,6-trichlorophenyl)-1 H-1,2,4-triazol-2-ium hexachloroantimonate (12) are obtained.
多功能亲电氯代 2-azoniaallene 盐 3-5 与双功能亲核物发生环化反应,生成杂环。报告了 1,2,3,4-四氢-1,3-二甲基-2,4-二氧代嘧啶并[4,5-d]嘧啶 7a,b、10a,b、14、17a,b 和 5,6,7,8-四氢-6,8-二甲基-5,7-二氧代嘧啶并[5,4-e]-1,3-恶嗪-1-鎓盐 9a,b、15 的制备过程,它们是新环系的首个代表。 此外,还得到了 2,3-二氢-1,3-二甲基-4-(甲硫基)-2-氧代-1,3,5-三嗪鎓盐 11d,e,13,以及 3-(二甲基氨基)-4,5-二氢-5-氧代-2-(2,4,6-三氯苯基)-1 H-1,2,4-三唑-2-鎓六氯锑酸盐(12)。