Ambient Temperature Hydrophosphination of Internal, Unactivated Alkynes and Allenyl Phosphineoxides with Phosphine Borane Complexes
摘要:
Phosphine boranes have been found to hydrophosphinate internal, unactivated alkynes at room temperature under basic conditions without the need for catalysts or radical initiators, The use of air-sensitive secondary phosphines is avoided in this facile process. Broad scope in both the phosphine borane and alkyne partners leads to excellent diversity in the phosphine products. Asymmetric hydrogenation of these species then provides one of the shortest possible routes to chiral monodentate phosphines, Hydrophosphination of allenyl phosphine oxides under similar conditions followed by hydrogenation of the exomethylene moiety yields a wide variety of bis-phosphine derivatives.
Ambient Temperature Hydrophosphination of Internal, Unactivated Alkynes and Allenyl Phosphineoxides with Phosphine Borane Complexes
作者:Carl A. Busacca、Elisa Farber、Jay DeYoung、Scot Campbell、Nina C. Gonnella、Nelu Grinberg、Nizar Haddad、Heewon Lee、Shengli Ma、Diana Reeves、Sherry Shen、Chris H. Senanayake
DOI:10.1021/ol9022547
日期:2009.12.17
Phosphine boranes have been found to hydrophosphinate internal, unactivated alkynes at room temperature under basic conditions without the need for catalysts or radical initiators, The use of air-sensitive secondary phosphines is avoided in this facile process. Broad scope in both the phosphine borane and alkyne partners leads to excellent diversity in the phosphine products. Asymmetric hydrogenation of these species then provides one of the shortest possible routes to chiral monodentate phosphines, Hydrophosphination of allenyl phosphine oxides under similar conditions followed by hydrogenation of the exomethylene moiety yields a wide variety of bis-phosphine derivatives.
Palladium(<scp>ii</scp>)-catalyzed vinylic geminal double C–H activation and alkyne annulation reaction: synthesis of pentafulvenes
作者:Jyotshna Phukon、Sanjib Gogoi
DOI:10.1039/c9cc09564k
日期:——
The first transition-metal-catalyzed vinylic geminal double C(sp2)-H activation and di-substituted alkyne annulationreaction is reported. This palladium(ii)-catalyzed, amide directed reaction of vinylic compounds with di-substituted alkynes offers an efficient synthetic path to pentafulvenes, which are very important compounds because of their bioactivity and interesting optical properties. A FeCl3-mediated