New fluorescent compounds, benzo[4,5]thieno[3,2-d]pyrimidine 5,5-dioxides (3a–g), 2-amino-4-methylsulfanylbenzo[4,5]thieno[3,2-d]pyrimidine (6), and 2-amino-4-methylsulfanyl-7-methoxybenzo[4,5]furo[3,2-d]pyrimidine (7), were synthesized in good yields from heterocyclic ketene dithioacetals (1a–c) and guanidine carbonate (2a) or (S)-methylisothiourea sulfate (2b) in pyridine under reflux. Among the fused pyrimidine derivatives, compound 3c, which has an amino group at the 2-position and a benzylamino group at the 4-position of the pyrimidine ring, showed the strongest solid-state fluorescence. The absorption and emission properties of the compounds were quantitatively reproduced by a series of ab initio quantum-chemical calculations.
新的荧光化合物,苯并[4,5]
噻吩[3,2-d]
嘧啶5,5-二氧化物(3a-g),2-
氨基-4-甲基
硫醇苯并[4,5]
噻吩[3,2-d]
嘧啶(6)和2-
氨基-4-甲基
硫醇-7-
甲氧基苯并[4,5]
呋喃[3,2-d]
嘧啶(7),从杂环酮
二硫代乙酸酯(1a-c)和
碳酸胍(2a)或(S)-甲基异
硫脲硫酸盐(2b)在
吡啶中回流合成,并且产率良好。在融合的
嘧啶衍
生物中,化合物3c,在
嘧啶环的2位具有
氨基基团,在4位具有苄
氨基基团,显示出最强的固态荧光。这些化合物的吸收和发射性质被一系列从头计算的量子
化学计算量化地再现。