Bithiophene-fusedbenzo[c]phospholes were successfully prepared by a TiII-mediated cyclization of dialkynylated bithiophene derivatives. It was revealed that the optical and electrochemical properties of the bithiophene-fusedbenzo[c]phospholes are deeply related to the π-conjugation modes at the fused bithiophene subunits. Both experimental and theoretical results demonstrate that the appropriately
Copper-catalyzed cascade annulation between α-bromocarbonyls and biaryl or (Z)-arylvinylacetylenes enabling a direct synthesis of dibenzocycloheptanes and related compounds
作者:Danyang Lu、Yimei Wan、Lichun Kong、Gangguo Zhu
DOI:10.1039/c6cc07727g
日期:——
A copper-catalyzed cascade annulation of [gamma],[small delta]-unsaturated [small alpha]-bromocarbonyls with biaryl or (Z)-arylvinylacetylenes is presented, giving an expeditious access to dibenzocycloheptanes and relatedcompounds in moderate to high yields. It provides a...
intermolecular addition–intramolecular carbocyclization reaction of dialkynylbenzenes was developed. In this reaction, regioselective addition of an external nucleophile toward the terminal alkyne and subsequent 6-endo-dig cyclization proceeded to give the 1,3-disubstituted naphthalenes in good yields. The direct synthesis of disubstituted chrysenesvia a gold-catalyzed addition and double cyclization cascade
Structure−Property Investigations of Conjugated Thiophenes Fused onto a Dehydro[14]annulene Scaffold
作者:Matthew J. O’Connor、Robert B. Yelle、Lev N. Zakharov、Michael M. Haley
DOI:10.1021/jo800225u
日期:2008.6.1
A series of 12 thieno-fused macrocycles based on the dehydro[14]annulene framework have been prepared. Studies have focused on the optical and electronic properties of the dehydrobenzothieno[14]annulenes (DBTAs) and dehydrothieno[14]annulenes (DTAs) utilizing NMR spectroscopy, UV−vis spectrophotometry, electrochemistry, and DFT computations. X-ray crystal structures were also obtained for two of the
Diisobutylaluminum Hydride Promoted Selectivity-Switchable Synthesis of Benzothiophene Oxides and Benzothiophenes via an Al–Li-Dimetalated Intermediate
We developed an efficient and direct method for synthesis of benzothiophene oxides from 1-bromo-2-[2-(trimethylsilyl)ethynyl]benzenes and thionylchloride as an easily accessible source of the sulfinyl group. Benzothiophenes were also synthesized selectively by simply increasing the amount of thionylchloride. These methods achieved efficient syntheses of various benzothiophene oxides and benzothiophenes