吡啶并[4,3- d ]嘧啶-4(3 H ^) -酮(1)通过反应来制备2-三氟甲基-4-碘-烟酸(2)与脒9A通过Pd催化2(DBA)3和加入Xantphos ,然后用HBTU进行环化,然后使用PhBCl 2脱甲基。发现idine基芳基化方法可用于喹唑啉-4(3 H)-one的合成。因此,将2-溴或2-碘代苯甲酸酯与am反应,可得到取代的喹唑啉-4(3 H)-一,产率为44-89%。
In accordance with the concept of regioexhaustivefunctionalization, both 3-chloro-2-(trifluoromethyl)pyridine and 2-bromo-6-(trifluoromethyl)pyridine were converted each time into the three possible carboxylic acids. 2-Bromo-4-(trifluoromethyl)pyridine, 2-bromo-5-(trifluoromethyl)pyridine, 2-iodo-4-(trifluoromethyl)pyridine, and 4-iodo-2-(trifluoromethyl)pyridine were selectively deprotonated and