A highly active catalyst for the reductive cyclization of ortho-nitrostyrenes under mild conditions
摘要:
A mild and efficient method for the palladium-Catalyzed reductive Cyclization of ortho-nitrostyrenes to afford indoles is reported. \Treatment of ortho-nitrostyrenes with 0.1 mol% palladium (II) trifluoracetate [Pd(TFA)(2)] and 0.7 mol% 3.4,7,8-tetramethyl-1,10-phenanthroline (tm-phen) in DMF at 15 psig CO and 80 degrees C afforded indoles in good to excellent yields. When the reaction was conducted in toluene. the corresponding N-hydroxyindole was isolated. A mechanism that accounts for the formation of N-hydroxyindole is proposed. (c) 2005 Elsevier Ltd. All rights reserved.
Electrosynthesis of Substituted 1<i>H</i>-Indoles from <i>o</i>-Nitrostyrenes
作者:Peng Du、Jonathan L. Brosmer、Dennis G. Peters
DOI:10.1021/ol2006049
日期:2011.8.5
A novel procedure has been devised for the synthesis of derivatives of 1H-indole that is based on the direct, room-temperature electrochemical reduction of substituted o-nitrostyrenes at carbon cathodes in N,N-dimethylformamide containing tetramethylammonium tetrafluoroborate as supporting electrolyte and in the presence of a 10-fold molar excess of a proton donor (phenol or methyl 3-oxobutanoate)
The synthesis of benzylphosphine oxides via vicarious nucleophilic substitution and alkenes via VNS–Horner–Wittig reactions
作者:Nicholas J. Lawrence、John Liddle、David Jackson
DOI:10.1039/b206144a
日期:——
A range of substituted nitrobenzenes react with the anion of (chloromethyl)diphenylphosphinoyl oxide to give the substituted nitrobenzyldiphenylphosphine oxide by vicarious nucleophilic substitution. The novel stereoselective synthesis of Eâstilbenes via a oneâpot vicarious nucleophilic substitutionâHornerâWittig reaction is described.
The synthesis of benzylphosphine oxides via aromatic vicarious nucleophilic substitution of hydrogen
作者:Nicholas J. Lawrence、John Liddle、David A. Jackson
DOI:10.1016/0040-4039(95)01744-3
日期:1995.11
A range of substituted nitrobenzenes react with the anion of choromethyldiphenylphosphinoyl oxide to give the substituted nitrobenzyldiphenylphosphine oxide by vicarious nucleophilicsubstitution. The novel stereoselective synthesis of E-stilbenes via a one-pot vicarious nucleophilicsubstitution/Horner-Wittig reaction is described.
A highly active catalyst for the reductive cyclization of ortho-nitrostyrenes under mild conditions
作者:Ian W. Davies、Jacqueline H. Smitrovich、Rick Sidler、Chuanxing Qu、Venita Gresham、Charles Bazaral
DOI:10.1016/j.tet.2005.03.142
日期:2005.6
A mild and efficient method for the palladium-Catalyzed reductive Cyclization of ortho-nitrostyrenes to afford indoles is reported. \Treatment of ortho-nitrostyrenes with 0.1 mol% palladium (II) trifluoracetate [Pd(TFA)(2)] and 0.7 mol% 3.4,7,8-tetramethyl-1,10-phenanthroline (tm-phen) in DMF at 15 psig CO and 80 degrees C afforded indoles in good to excellent yields. When the reaction was conducted in toluene. the corresponding N-hydroxyindole was isolated. A mechanism that accounts for the formation of N-hydroxyindole is proposed. (c) 2005 Elsevier Ltd. All rights reserved.
Biphilic Organophosphorus-Catalyzed Intramolecular C<sub>sp<sup>2</sup></sub>–H Amination: Evidence for a Nitrenoid in Catalytic Cadogan Cyclizations
作者:Trevor V. Nykaza、Antonio Ramirez、Tyler S. Harrison、Michael R. Luzung、Alexander T. Radosevich
DOI:10.1021/jacs.7b13803
日期:2018.2.28
equiv of phosphetane P-oxide 3·[O] and 2-nitrosobiphenyl. Experimental and computationalinvestigations into the C-N bond forming event suggest the involvement of an oxazaphosphirane (2 + 1) adduct between 3 and 2-nitrosobiphenyl, which evolves through loss of phosphetane P-oxide 3·[O] to give the observed carbazole product via C-H insertion in a nitrene-like fashion.