23868-11-3Relevant academic research and scientific papers
Synthesis of 1H-Indazoles from Imidates and Nitrosobenzenes via Synergistic Rhodium/Copper Catalysis
Wang, Qiang,Li, Xingwei
, p. 2102 - 2105 (2016/06/01)
Nitrosobenzenes have been used as a convenient aminating reagent for the efficient synthesis of 1H-indazoles via rhodium and copper catalyzed C-H activation and C-N/N-N coupling. The reaction occurred under redox-neutral conditions with high efficiency and functional group tolerance. Moreover, a rhodacyclic imidate complex has been identified as a key intermediate.
Friedel-crafts chemistry. Part 39. unprecedented facile route to the synthesis of benzo[b][1]benzazepines via intramolecular friedel-crafts cyclialkylations
El-Aal, Hassan A. K. Abd,Khalaf, Ali A.
, p. 635 - 645 (2013/07/26)
A series of six pharmaceutically promising 5,6-dihydro-11H-benzo[b][1] benzazepine derivatives (1c-h) were cleanly prepared by Friedel-Crafts cyclialkylations of nitrogen-containing alkanols in the presence of AlCl3, 85% H2SO4 or polyphosphoric acid catalysts. The precursor alkanols (13a-f) were readily prepared by reaction of two synthesized carboxylic acid esters (12a, b) with different Grignard reagents. Also, two dibenzo[b,f]azepinones (15a, b) were prepared by Friedel-Crafts cycliacylation and reduced to the corresponding 5,6-dihydro-11H-benzo[b][1]benzazepines (1a, b). Overall, this approach allows easy and efficient access to polytricyclic amines from easily synthesized alkanols or cycloketones. A plausible carbocation mechanism is proposed to account for the results.
Metal-free direct amination/aromatization of 2-cyclohexenones to iodo-N-arylanilines and N-arylanilines promoted by iodine
Barros, M. Teresa,Dey, Suvendu S.,Maycock, Christopher D.,Rodrigues, Paula
supporting information, p. 10901 - 10903,3 (2020/09/16)
An iodine mediated aromatization leading to a one-pot synthesis of iodo-N-arylanilines and N-arylanilines is reported. This highly regioselective aliphatic-aromatic transformation can be performed with various combinations of 2-cyclohexenones and anilines. The presence of a directing group is crucial for achieving high yields.
Fischer indolization of ethyl pyruvate 2-[2- (trifluoromethyl)phenyl]phenylhydrazone and new insight into the mechanism of the Goldberg reaction. (Fischer indolization and its related compounds. XXVI)
Murakami,Watanabe,Hagiwara,Akiyama,Ishii
, p. 1281 - 1286 (2007/10/02)
The Fischer indolization of ethyl pyruvate 2-[2- (trifluoromethyl)phenyl]phenylhydrazone (5) gave two indolic products, ethyl 7-(trifluoromethyl)-1-phenylindole-2-carboxylate (12) as a minor product and ethyl 1-[2-(trifluoromethyl)phenyl]indole-2-carboxylate (13) as a major product. This result shows that the Fischer indolization occurred on the more electron-rich phenyl group. In the Goldberg reaction to prepare 13 from ethyl indole-2-carboxylate (15) and o- (21) or m-bromo-α,α,α-trifluorotoluene (23), it was found that Goldberg reaction proceeds via a benzyne mechanism, at least in part, in a sterically crowded situation.
