limited synthetic strategies toward 1,2,4-triazoles have hindered the development of new scaffolds. Herein, we first developed an efficient strategy to construct carboxylate triazoles via a silver oxide catalyzed [3 + 2] cycloaddition reaction of heterocyclic diazonium (2, 3, 4 or 5) with ethyl 2-isocyanoacetate. Compounds 2a–5a were fully characterized and were used to prepare four nitrogen-rich heat-resistant
1,2,4-三唑是在许多领域中发现的特殊结构基序,包括药物、
天然产物以及含能材料。然而,
1,2,4-三唑的有限合成策略阻碍了新支架的开发。在此,我们首先开发了一种通过
氧化银催化杂环重氮(2、3、4或5)与2-
异氰基乙酸乙酯的[3+2]环加成反应构建
羧酸三唑的有效策略。化合物2a-5a经过充分表征,用于制备四种富氮耐热炸药
TTTN(2c)、B
TTN(3c)、D
TTN(4c)和A
TTN(5c)。所有化合物 ( 2c–5c ) 的氮含量都很高,>50%。此外,化合物A
TTN(5c)表现出良好的性能(D = 8473 ms -1,P = 25.0 GPa,IS > 40 J,FS > 360 N)和高热稳定性(T d = 318 °C),这表明它作为耐热炸药的潜力。