Synthesis of Indoles by Reductive Cyclization of Nitro Compounds Using Formate Esters as CO Surrogates
作者:Manar Ahmed Fouad、Francesco Ferretti、Dario Formenti、Fabio Milani、Fabio Ragaini
DOI:10.1002/ejoc.202100789
日期:2021.9.14
A very efficient, general and scalable protocol for the preparation of indoles and other N-heterocycles from suitably substituted nitroarenes using alkyl and phenyl formates as CO surrogates was described. Using phenyl formate, the products were isolated in yields often higher than those previously achieved by using gaseous CO. The mechanism of both the decarbonylation reaction of phenyl formate and
描述了使用烷基和苯基甲酸酯作为 CO 替代物从适当取代的硝基芳烃制备吲哚和其他N-杂环的非常有效、通用和可扩展的方案。使用甲酸苯酯,产物的分离产率通常高于以前使用气态 CO 实现的产率。通过动力学和机理研究阐明了甲酸苯酯的脱羰反应和环化反应的机理。
Iron-Catalyzed Allylic C-H Amination of Substituted 1,3-Dienes
作者:Siva Murru、Radhey S. Srivastava
DOI:10.1002/ejoc.201301914
日期:2014.4
A catalytic method for the selective allylic C–H amination of dienes and trienes using arylhydroxylamines has been developed. This iron-catalyzed approach involves the in situ generation of activated nitrosoarenes, which in turn react with dienes or trienes to give the corresponding aminomethyl dienes or trienes as the major products, and hetero-Diels–Alder adducts as minor products. The selectivity
On the Mechanism of Allylic Amination Catalyzed by Iron Salts
作者:Radhey S. Srivastava、Kenneth M. Nicholas
DOI:10.1021/ja964006t
日期:1997.4.1
high regioselectivity resulting from double-bond transposition. The iron-catalyzed reaction of phenylhydroxylamine with representative alkenes in the presence of 2,3-dimethylbutadiene, an effective PhNO trap, produces allyl amines exclusively, excluding the intermediacy of free PhNO in the amination reaction. The reaction of FeCl2,3 with PhNO or PhNHOH produces a novel azo dioxide iron complex, Fe
Synthesis of 3,6-Dihydro-2<i>H</i>-[1, 2]-Oxazines from Nitroarenes and Conjugated Dienes, Catalyzed by Palladium/Phenanthroline Complexes and Employing Phenyl Formate as a CO Surrogate
作者:Mohamed A. EL-Atawy、Dario Formenti、Francesco Ferretti、Fabio Ragaini
DOI:10.1002/cctc.201801223
日期:2018.10.23
Palladium/phenanthroline catalyzedreduction of nitroarenes by in situ‐generated carbon monoxide, from the decomposition of phenyl formate, affords the corresponding nitrosoarenes. The latter are trapped by conjugated dienes to give the corresponding 3,6‐dihydro‐2H‐[1, 2]‐oxazines (hetero Diels‐Alder adducts). Many functional groups are well tolerated. Yields are higher than those obtainable by any
In Situ Generation of Nitroso Compounds from Catalytic Hydrogen Peroxide Oxidation of Primary Aromatic Amines and Their One-Pot Use in Hetero-Diels–Alder Reactions
作者:Dongbo Zhao、Mikael Johansson、Jan-E. Bäckvall
DOI:10.1002/ejoc.200700368
日期:2007.9
sulfides to sulfoxides and this catalytic system was recycled and reused in an ionic liquid.In the third example, primary aromatic amines were oxidized by H2O2 to nitrosocompounds in a selenium-catalyzed oxidation. The nitrosoarenes were used in a one-pot hetero Diels-Alder reaction with dienes forming 1,2-oxazines.In the fourth example, a cobalt salophen complex was immobilized in different zeolites