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.
Rigid rod and tetrahedral hybrid compounds featuring nucleobase and nucleoside end-capped structures
作者:Diana Schindler、Frank Eißmann、Edwin Weber
DOI:10.1039/b904889h
日期:——
design strategy of molecular tectons, making use of the conjugation between a shape defined artificial backbone and the bioinspired molecular fragments of nucleobases or nucleobase derivatives as functional end-caps, has been developed. This led to the formation of the new hybrid compounds 1–13 of linear and tetrahedral geometry, containing uracil, adenine, adenosine, guanosine and its acylated analogs
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)
6,6'-Bibenzo[b]selenophenes were prepared from 4,4'-dibromobiphenyl by the Sonogashira coupling with terminal alkynes followed by heterocyclization with SeBr4.