Heterocumulene-mediated annelation of a [1,3,4]thiadiazine or [1,3,4]oxadiazine ring into an imidazole ring: preparation and crystal structure of some derivatives of the unknown imidazo[1,5-d]-[1,3,4]thiadiazine and imidazo[1,5-d́][1,3,4]oxadiazine ring systems
作者:Pedro Molina、Antonio Arques、Ma. Asunción Alias、Antonio Luis Llamas-Saiz、Concepción Foces-Foces
DOI:10.1016/s0040-4020(01)86770-3
日期:——
Iminophosphorane 2 reacts under mild conditions with isothiocyanates to form imidazo[1,5-d]-[1,3,4]thiadiazines 3 which undergo S-methylation to give imidazo[1,5-d][1,3,4]thiadiazinium salts 4. Iminophosphorane 2 also reacts with isocyanates under mild conditions to give imidazo[1,5-d][1,3,4]oxadiazines 5. The N-aminoheterocycle 1 by the action of diaryl carbodiimides undergoes ring-closure/ring-opening reaction
衍生自1-氨基-3-苯基-2-硫代x -4-咪唑啉酮1的亚氨基磷烷2与杂枯烯的氮杂-维蒂希反应导致稠合的咪唑。亚氨基磷烷2在温和的条件下与异硫氰酸酯反应形成咪唑并[1,5- d ]-[1,3,4]噻二嗪3,将其进行S-甲基化反应得到咪唑并[1,5- d ] [1,3,4]噻二嗪盐4。亚氨基磷烷2在温和的条件下也与异氰酸酯反应,生成咪唑并[1,5- d ] [1,3,4]恶二嗪5。N-氨基杂环1通过二芳基碳二亚胺的作用进行闭环/开环反应,得到相应的[1,2,4]三唑7,通过依次用三氟硼酸三甲基氧鎓和三乙胺/甲醇处理,将其转化为氧类似物9。水合盐4a的晶体结构已经通过X射线衍射法解析。两个独立的阳离子形成二聚体,它们通过氢相互作用沿轴成链状堆积,以使所有阴离子和溶剂分子(非对称单元中的H 2 O和2 HCCl 3)位于晶胞中两个通道中描述。