185903-44-0Relevant articles and documents
Synthesis of a carbon analogue of scytonemin
Mukai, Chisato,Arima, Katsuya,Hirata, Shuichi,Yasuda, Shigeo
, p. 273 - 277 (2015)
The synthesis of a carbon analogue of scytonemin was accomplished on the basis of molybdenum-mediated intramolecular double Pauson-Khand type reaction of bis(allenyne), followed by the double aldol condensation of the formed double Pauson-Khand type adduct.
Experimental and computational evidence for gold vinylidenes: Generation from terminal alkynes via a bifurcation pathway and facile C-H insertions
Ye, Longwu,Wang, Yanzhao,Aue, Donald H.,Zhang, Liming
, p. 31 - 34 (2012/02/15)
Facile cycloisomerization of (2-ethynylphenyl)alkynes is proposed to be promoted synergistically by two molecules of BrettPhosAuNTf2, affording tricyclic indenes in mostly good yields. A gold vinylidene is most likely generated as one of the reaction intermediates on the basis of both mechanistic studies and theoretical calculations. Different from the well-known Rh, Ru, and W counterparts, this novel gold species is highly reactive and undergoes facile intramolecular C(sp3)-H insertions as well as O-H and N-H insertions. The formation step for the gold vinylidene is predicted theoretically to be complex with a bifurcated reaction pathway. A pyridine N-oxide acts as a weak base to facilitate the formation of an alkynylgold intermediate, and the bulky BrettPhos ligand in the gold catalyst likely plays a role in sterically steering the reaction toward formation of the gold vinylidene.
Synthesis of novel "rod-coil" brush polymers with conjugated backbones through bergman cyclization
Cheng, Xin,Ma, Jianguo,Zhi, Jian,Yang, Xi,Hu, Aiguo
experimental part, p. 909 - 913 (2011/10/08)
This work reports synthesis of "rod-coil" brush polymers with rigid conjugated backbone. "Grafting through" strategy was employed via combination of ring-opening polymerization (ROP) and Bergman cyclization polymerization. Enediyne-containing macromonomer
Synthesis of indeno-fused derivatives of quinolizinium salts, imidazo[1,2-a]pyridine, pyrido[1,2-a]indole, and 4H-quinolizin-4-one via benzannulated enyne-allenes
Dai, Weixiang,Petersen, Jeffrey L.,Wang, Kung K.
, p. 6647 - 6652 (2007/10/03)
The benzannulated enediynyl propargylic alcohol 8 was prepared from 1-bromo-2-iodobenzene by two consecutive Sonogashira cross-coupling reactions. The subsequent transformation to mesylate 9 followed by treatment with 4-substituted pyridines 10 then furni
Tandem Enyne Allene-Radical Cyclization: Low-Temperature Approaches to Benz[e]indene and Indene Compounds
Grissom, Janet Wisniewski,Klingberg, Detlef,Huang, Dahai,Slattery, Brian J.
, p. 603 - 626 (2007/10/03)
In an effort to lower the temperatures required to prepare multicyclic compounds using the tandem enediyne-radical cyclization, we have developed the tandem enyne allene-radical cyclization which proceeds at temperatures as low as 37°C. The reactions were
Tandem enyne allene-radical cyclization via base-catalyzed isomerization of enediyne sulfones
Grissom,Wisniewski, Janet,Klingberg
, p. 6607 - 6610 (2007/10/02)
Enediyne sulfones 12-16 undergo a base-catalyzed isomerization to the corresponding enyne allenes followed by a tandem enyne allene-radical cyclization at 37°C to provide 2,3-dihydrobenz[e]indenes 17-21 in good yields.
