Copper(<scp>ii</scp>)-catalyzed oxidative <i>N</i>-nitrosation of secondary and tertiary amines with nitromethane under an oxygen atmosphere
作者:Norio Sakai、Minoru Sasaki、Yohei Ogiwara
DOI:10.1039/c5cc03675e
日期:——
combination of a catalytic amount of Cu(OTf)2 and less than a stoichiometric amount of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) under an O2 atmosphere effectively promoted the N-nitrosation of both secondary aromatic/aliphatic amines...
We report herein a Rh(III)-catalyzed cyclization of N-nitrosoanilines with alkynes for streamlined synthesis of indoles. The synthetic protocol features a distinct internal oxidant, N-N bond, as a reactive handle for catalyst turnover, as well as a hitherto tantalizingly elusive intermolecular redox-neutral manifold, predicated upon C-H activation, for the formation of a five-membered azaheterocycle
C–H Activation-Based Traceless Synthesis via Electrophilic Removal of a Directing Group. Rhodium(III)-Catalyzed Entry into Indoles from <i>N</i>-Nitroso and α-Diazo-β-keto Compounds
A distinct C–H activation-based traceless synthetic protocol viaelectrophilic removal of a directing group is reported, complementing the currently exclusively used nucleophilic strategy. Rh(III)-catalyzed, N-nitroso-directed C–H activation allows the development of a traceless, atom- and step-economic, cascade approach for the synthesis of indole skeletons, starting from readily available N-nitroso
Palladium-catalyzed ortho-acyloxylation of N-nitrosoanilines via direct sp<sup>2</sup> C–H bond activation
作者:Dan-Dan Li、Yi-Xuan Cao、Guan-Wu Wang
DOI:10.1039/c5ob00691k
日期:——
The palladium-catalyzed N-nitroso-directed ortho-acyloxylation of N-nitrosoanilines has been demonstrated via sp2 C–H activation with PhI(OAc)2 as the oxidant and Ac2O/AcOH (1 : 1) or C2H5CO2H as the reaction medium.
Palladium-Catalyzed <i>N</i>-Nitroso-Directed C–H Alkoxylation of Arenes and Subsequent Formation of 2-Alkoxy-<i>N</i>-alkylarylamines
作者:Tingting Gao、Peipei Sun
DOI:10.1021/jo501902d
日期:2014.10.17
A palladium-catalyzed direct ortho-alkoxylation of N-alkyl-N-nitrosoarylamines was developed in which alcohols were used as the alkoxylation reagents and PhI(OAc)2 was employed as the oxidant. The protocol was available for both primary and secondary alcohols. The products were transformed to o-alkoxy-N-alkylanilines expediently by a simple reduction.