An efficient transition-metal-free strategy to synthesize 2-aryloxypyridine derivatives has been developed by a selective O-arylation of 2-pyridones with diaryliodonium salts. The reaction was compatible with a series of functional groups for 2-pyridones and diaryliodonium salts such as halides, nitro, cyano, and ester groups. The substituents at the C6-position of 2-pyridones favored O-arylation products because of steric hindrance. The reaction was easily performed on a gram-scale and 6-chloro-2-pyridone was a good precursor to access various unsubstituted 2-aryloxypyridines by dehalogenation. A P2Y1 lead compound analogue could be prepared in good yield over two steps.
开发了一种高效的过渡
金属自由策略,通过选择性的氧芳基化2-
吡啶酮与二芳基
碘盐合成2-芳氧基
吡啶衍生物。该反应与一系列功能团对2-
吡啶酮和二芳基
碘盐兼容,如卤素、硝基、
氰基和酯基等。2-
吡啶酮的C6位取代基有利于氧芳基化产物的生成,因为存在立体位阻。该反应易于在克级规模上进行,并且6-
氯-2-
吡啶酮是通过去卤代法获得各种未取代的2-芳氧基
吡啶的良好前体。通过两步反应可以以较高产率制备P2Y1前体类似物。