Regioselective synthesis of indazolo[2,3-<i>a</i>]quinazolines enabled by I<sub>2</sub>/S-facilitated annulation relay dehydrogenative aromatization of cyclohexanones
A method for concise and efficient synthesis of indazolo[2,3-a]quinazolines has been developed via a sequential annulation of 3-aminoindazoles and dehydrogenative aromatization of cyclohexanones. This high regioselectivity is attributed to the fact that the Mannich reaction is superior to the aldol reaction in this system. It is worth mentioning that this convenient process is successfully extended
通过3-氨基吲唑的连续环化和环己酮的脱氢芳构化,开发了一种简洁有效地合成吲唑并[2,3- a ]喹唑啉的方法。这种高区域选择性归因于该系统中曼尼希反应优于羟醛反应。值得一提的是,这种方便的过程已成功扩展到3-氨基吡唑,用于组装另一类医学上流行的吡唑并[1,5- a ]喹唑啉。