Cyclization Reactions of Chloro-Substituted 2-Azoniaallene Salts with Bifunctional Nucleophiles

All articles of this category 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.