Preparation of phenanthridines from N-(o-arylbenzyl)trifluoromethanesulfonamides with 1,3-diiodo-5,5-dimethylhydantoin
作者:Kei Yanai、Hideo Togo
DOI:10.1016/j.tet.2020.131503
日期:2020.10
6-arylphenanthridines and 6-unsubstituted phenanthridines in good to moderate yields, respectively. The reaction proceeds through an oxidative cyclization onto the aromatic ring by sulfonamidyl radicals formed from the N-iodosulfonamides. The present reaction is a one-pot method for the preparation of both 6-arylphenanthridines and 6-unsubstituted phenanthridines from N-(o-arylbenzyl)trifluoromethanesulfonamides
6-Arylphenanthridines from Aryl <i>o</i>
-Biaryl Ketones with 1,1,1,3,3,3-Hexamethyldisilazane and Molecular Iodine
作者:Eiji Kobayashi、Atsushi Kishi、Hideo Togo
DOI:10.1002/ejoc.201901278
日期:2019.11.30
Aryl biaryl ketones were transformed into 6‐arylphenanthridines efficiently by the reaction with 1,1,1,3,3,3‐hexamethyldisilazane in the presence of Sc(OTf)3 in toluene, followed by removal of the solvent, and the subsequent reaction with molecular iodine and K2CO3 in a mixture of THF and methanol.
在甲苯中Sc(OTf)3存在下,通过与1,1,1,1,3,3,3-六甲基二硅氮烷反应,将芳基联芳基酮有效地转化为6-芳基菲啶,然后除去溶剂,然后进行后续反应分子碘和THF和甲醇的混合物中的K 2 CO 3。
Preparation of Phenanthridines from <i>o</i>-Cyanobiaryls via Addition of Organic Lithiums to Nitriles and Imino Radical Cyclization with Iodine
作者:Atsushi Kishi、Katsuhiko Moriyama、Hideo Togo
DOI:10.1021/acs.joc.8b01688
日期:2018.9.21
methyllithium, ethylmagnesium bromide, butyllithium, phenyllithium, p-methylphenyllithium, etc., followed by the reaction with water and then with molecular iodine at 60 °C provided efficiently 6-methyl-, 6-ethyl-, 6-butyl-, 6-phenyl, 6-(p-methylphenyl)phenanthridines, etc., in good yields, respectively. Here, imines formed through the addition of carbanion onto the nitriles reacted with molecular iodine
Nitrenoid from Oxime: A Practical Synthesis of Planar Chiral Ferrocenyl Phenanthridines via Nitrene‐Involved Ring‐Expansion Reaction
作者:Na Li、Biqiong Hong、Jinbo Zhao、Zhenhua Gu
DOI:10.1002/anie.202215530
日期:2023.1.2
A new Grignard reagent-mediated synthesis of ferrocene-based phenanthridinesfromoximes was developed. The tertiary magnesium-zinc nitrenoid was proposed as the key intermediate, which underwent ring-expansion/rearrangement to form the pyridine skeleton.
Herein, we report a copper‐catalyzed intramolecular benzylic C(sp3)−H oxidation of unprotected aniline derivatives under aerobic conditions, which enables the preparation of phenanthridine compounds. To the best of our knowledge, this is the pioneering reaction of dehydrogenative C(sp3)−N bond formation from unprotected anilines under a Cu/O2 system. Notably, various anilines possessing alkyl, methoxy