Gold Catalysts Can Generate Nitrone Intermediates from a Nitrosoarene/Alkene Mixture, Enabling Two Distinct Catalytic Reactions: A Nitroso-Activated Cycloheptatriene/Benzylidene Rearrangement
作者:Sayaji Arjun More、Rahul Dadabhau Kardile、Tung-Chun Kuo、Mu-Jeng Cheng、Rai-Shung Liu
DOI:10.1021/acs.orglett.1c01857
日期:2021.7.16
Gold-catalyzedreactions of cycloheptatrienes with nitrosoarenes yield nitrone derivatives efficiently. This reaction sequence enables us to develop gold-catalyzed aerobic oxidations of cycloheptatrienes to afford benzaldehyde derivatives using CuCl and nitrosoarenes as co-catalysts (10–30 mol %). Our density functional theory calculations support a novel nitroso-activated rearrangement, tropylium
Reductive complexation of cycloheptatrienes by iron pentacarbonyl and catalytic sodium borohydride
作者:Yoann Coquerel、Jean-Pierre Deprés
DOI:10.1039/b111618p
日期:2002.3.7
Fe(CO)5 and a catalytic amount of sodiumborohydride react with cycloheptatrienes in protic solvents to yield the corresponding tricarbonyl(eta 4-1,3-diene)iron complexes in a one-pot procedure, which has been found to be particularly efficient for the synthesis of the useful tricarbonyl(cyclo-heptadiene)iron complex.
On the reaction with a base (e.g., aqueous sodium hydroxide), isopropyl- and methyl-tropylium ions afforded cycloheptatrienyl polymers with an alkylene bridge, such as IIIa and IIIb, while the t-butyltropylium ion gave a mixture of 3- and 4-t-butyltropone, which was then transformed to 4-and 5-t-butyltropolone (VIIIa and IX). The bromination of VIIIa with 3 mol of bromine in methanol gave 3,7-dibromo-4-t-butyl-2-methoxy-2,3-dihydrotropolone (XIIa). On the heating of the adduct (XIIa) at 130°C, 7-bromo-4-t-butyltropolone (XIa) was formed.
Catalytic [6π+2π]-cycloaddition of Si-containing alkynes to 7-substituted 1,3,5-cycloheptatrienes under the action of Ti(acac)2Cl2–Et2AlCl
作者:Vladimir A. D'yakonov、Gulnara N. Kadikova、Dmitriy I. Kolokol'tsev、Ilfir R. Ramazanov、Usein M. Dzhemilev
DOI:10.1016/j.jorganchem.2015.06.006
日期:2015.10
two-component Ti(acac)2Cl2–Et2AlCl system, resulting in the formation of substituted bicyclo[4.2.1]nona-2,4,7-trienes in high yields, was accomplished. The structures of the obtained compounds were confirmed by 1H, 13C NMR spectroscopy. The reaction mechanism was studied through quantum chemical modeling of the cycloheptatriene and acetylene interaction with TiCl4–Et2AlCl system at the B3LYP/6-31G(d) level
Titanium-Catalyzed [6π+2π]-Cycloaddition of Alkynes and Allenes to 7-Substituted 1,3,5-Cycloheptatrienes
作者:Vladimir A. D'yakonov、Gulnara N. Kadikova、Dmitry I. Kolokol'tsev、Ilfir R. Ramazanov、Usein M. Dzhemilev
DOI:10.1002/ejoc.201500442
日期:2015.7
5-cycloheptatrienes with alkynes and allenes, catalyzed by the two-component Ti(acac)2Cl2–Et2AlCl system, resulting in the formation of substitutedbicyclo[4.2.1]nona-2,4-dienes and bicyclo[4.2.1]nona-2,4,7-trienes in up to 90 % yield, was accomplished. The structures of the obtained compounds were confirmed by X-ray diffraction and by 1H and 13C NMR spectroscopic analysis.