Naphthalene-1,8-diylbis(diphenylmethylium) as an Organic Two-Electron Oxidant: Benzidine Synthesis via Oxidative Self-Coupling of N,N-Dialkylanilines
摘要:
Naphthalene-1,8-diylbis(diphenylmethylium) exhibits a unique electron-transfer reduction behavior due to the close proximity of the two triarylmethyl cations, which form a C-C bond while accepting two electrons, leading to 1,1,2,2-tetraphenylacenaphthene. The preparation of the dication was readily accomplished under anhydrous conditions starting from a cyclic bis(triarylmethyl) ether, derived from 1,8-dibromonaphthalene. The process proceeded via deoxygenation accompanying the formation of a disiloxane on treatment with a silylating agent (Me3SiClO4 or Me3SiOTf) in 1,1,1,3,3,3-hexafluoropropan-2-ol. The dication was successfully employed for oxidative coupling of N, N-dialkylanilines at the paraposition to afford the corresponding benzidines in good to excellent yield.
naphthalene-1,8-diylbis(diphenylmethylium), successfully promoted oxidative arylation of the sulfur atom in (4-N,N-dialkylaminophenyl) phenyl sulfides with (4-N,N-dialkylaminopheny)silanes, affording triarylsulfoniumsalts in good yield.
1,8-Bis(diphenylmethylium)naphthalenediyl Dication as an Organic Oxidant: Synthesis of Benzidines via Self-Coupling of <i>N,N</i>-Dialkylanilines
作者:Terunobu Saitoh、Suguru Yoshida、Junji Ichikawa
DOI:10.1021/ol048058w
日期:2004.11.1
1,8-Bis(diphenylmethylium)naphthalenediyl dications promoted oxidative coupling of various N,N-dialkylanilines to afford the corresponding para-coupled bisanilines, benzidines, in good to excellent yield. The dications were readily prepared from a cyclic ether precursor, derived from 1,8-dibromonaphthalene, via deoxygenation with a silylating reagent in 1,1,1,3,3,3-hexafluoro-2-propanol under anhydrous conditions.
Naphthalene-1,8-diylbis(diphenylmethylium) as an Organic Two-Electron Oxidant: Benzidine Synthesis via Oxidative Self-Coupling of <i>N,N</i>-Dialkylanilines
作者:Terunobu Saitoh、Suguru Yoshida、Junji Ichikawa
DOI:10.1021/jo060662s
日期:2006.8.1
Naphthalene-1,8-diylbis(diphenylmethylium) exhibits a unique electron-transfer reduction behavior due to the close proximity of the two triarylmethyl cations, which form a C-C bond while accepting two electrons, leading to 1,1,2,2-tetraphenylacenaphthene. The preparation of the dication was readily accomplished under anhydrous conditions starting from a cyclic bis(triarylmethyl) ether, derived from 1,8-dibromonaphthalene. The process proceeded via deoxygenation accompanying the formation of a disiloxane on treatment with a silylating agent (Me3SiClO4 or Me3SiOTf) in 1,1,1,3,3,3-hexafluoropropan-2-ol. The dication was successfully employed for oxidative coupling of N, N-dialkylanilines at the paraposition to afford the corresponding benzidines in good to excellent yield.
Synthesis and Reactivity of a Chlorinated 1,8-Bis(diarylmethylium)naphthalenediyl Dication
作者:Huadong Wang、François P. Gabbaï
DOI:10.1021/ol0477071
日期:2005.1.1
8-Bis(bis(p-chlorophenyl)methylium)naphthalenediyl dication has been prepared by treatment of the corresponding diol with a mixture of [HBF4]aq and (CF3CO)2O. The proximity of the methylium centers leads to strong electrostatic repulsions that are exacerbated by the electron-withdrawing p-chloro substituents. As indicated by cyclic voltammetry, this dication is the strongest oxidant of the 1,8-bis(methy