Preparation of conjugated 6,6’-bibenzo[b]selenophenes
摘要:
6,6'-Bibenzo[b]selenophenes were prepared from 4,4'-dibromobiphenyl by the Sonogashira coupling with terminal alkynes followed by heterocyclization with SeBr4.
different palladium complexes of sydnones and sydnone imines and a co-catalyst system consisting of lithium sydnone-4-carboxylate and Pd(PPh3)4 catalyzed Sonogashira-Hagihara reactions between (hetero)aromatic bromides and 2-methylbut-3-yn-2-ol (52 examples, up to 100% yield). The co-catalyst system and a sydnone Pd complex were also tested in Buchwald-Hartwig reactions (9 examples, up to 100% yield)