A Novel, One-Pot Synthesis of α-<i>C</i>-Cyanohydrazines in the Presence of Lithium Perchlorate/Diethylether Solution (5.0 M)
作者:Akbar Heydari、Robabe Baharfar、Mohsen Rezaie、Saied M. Aslanzadeh
DOI:10.1246/cl.2002.368
日期:2002.3
Condensation of N,N-dimethylhydrazine, an aldehyde in lithium perchlorate/diethylether solution (5.0 M) gave N,N-dimethylhydrazone, which were treated with trimethylsilyl-cyanide to afford α-C-cyanohydrazine. These compounds are important precursors of nitrogen-substituted reagents.
Preparation and Deprotection of Aldehyde Dimethylhydrazones
作者:Richard J. Petroski
DOI:10.1080/00397910600616776
日期:2006.7
Abstract Aldehydes were conveniently protected as dimethylhydrazones by stirring a mixture of the aldehyde, N,N‐dimethylhydrazine, anhydrous magnesium sulfate, and dichloromethane at room temperature. Azeotropic removal of water, formed during the course of the reaction, was not required because anhydrous magnesium sulfate functions as a water scavenger. Deprotection of aldehydedimethylhydrazones was accomplished
Solvent-Free Conversion of N,N-Dimethylhydrazones to Nitriles Under Microwave Irradiation
作者:T. Ramalingam、B. V. Subba Reddy、R. Srinivas、J. S. Yadav
DOI:10.1080/00397910008087080
日期:2000.12.1
Abstract A variety of aldehyde N,N-dimethylhydrazones are rapidly converted into the corresponding nitriles using oxone supported on wet Al2O3 under microwave irradiation in dry media.
MTO catalyzed oxidation of aldehyde N,N-dimethylhydrazones with hydrogen peroxide: high yield formation of nitriles and N-methylene-N-methyl N-oxide
作者:Henri Rudler、Bernard Denise
DOI:10.1039/a804839h
日期:——
N,N-Dimethylhydrazones of aldehydes react with hydrogen peroxide at –50 °C in the presence of catalytic amounts of methyltrioxorhenium (MTO) to give in high yield the corresponding nitriles and N-methylene-N-methyl N-oxide.
One-pot synthesis of 1-alkyl-1H-indazoles from 1,1-dialkylhydrazones via aryne annulation
作者:Nataliya A. Markina、Anton V. Dubrovskiy、Richard C. Larock
DOI:10.1039/c2ob07117g
日期:——
The reaction of readily accessible 1,1-dialkylhydrazones with commercially available o-(trimethylsilyl)aryl triflates provides a direct one-step route to pharmaceutically important 1-alkylindazoles. The products are obtained in high yields by one-pot NCS-chlorination/aryne annulation or Ac2O-acylation/deprotection/aromatization protocols.