synthesis of 4-substituted-6-fluoro(carboalkoxyl)benzo[b]furans and benzo[b]thiophenes is described. The reactions of heterocyclic aromatic aldehydes with a Wittig reagent, followed by Sonogashira reaction with terminal alkynes, and subsequent base-catalyzed cyclization site-specifically provide 4-substituted-6-fluoro(carboalkoxyl)benzo[b]furans and benzo[b]thiophenes in good yields.
描述了4-取代的6-
氟(羰基烷氧基)苯并[ b ]
呋喃和苯并[ b ]
噻吩的位点特异性合成。杂环芳族醛与Wittig试剂反应,然后与末端
炔烃进行Sonogashira反应,然后进行碱催化的环化位点,可特异性地提供4-取代的6-
氟(羰基烷氧基)苯并[ b ]
呋喃和苯并[ b ]
噻吩丰产。