2840-40-6Relevant academic research and scientific papers
Visible-light-induced oxidation/[3 + 2] cycloaddition/oxidative aromatization to construct benzo[ a]carbazoles from 1,2,3,4-tetrahydronaphthalene and arylhydrazine hydrochlorides
Shen, Jiaxuan,Li, Nannan,Yu, Yanjiang,Ma, Chunhua
, p. 7179 - 7183 (2019/09/30)
An efficient synthesis of benzo[a]carbazoles via visible-light-induced tandem oxidation/[3 + 2] cycloaddition/oxidative aromatization reactions was reported. The benzylic C(sp3)-H of tetrahydronaphthalene was activated through visible-light photoredox catalyst with oxygen as the clean oxidant under mild reaction conditions. This protocol proceeds efficiently with broad substrate scope, and the mechanism study was performed.
Tuning chemical compositions of bimetallic AuPd catalysts for selective catalytic hydrogenation of halogenated quinolines
Zhang, Sai,Xia, Zhaoming,Ni, Ting,Zhang, Huan,Wu, Chao,Qu, Yongquan
, p. 3260 - 3266 (2017/02/26)
Catalytic hydrogenation of halogenated quinolines is a longstanding challenge due to the harsh reaction conditions and disillusionary chemoselectivity owing to dehalogenation. Exploration of novel catalytic materials is still a big challenge. Herein, density functional theory calculations indicate that halogenated quinolines are selectively adsorbed on the Au surface via the nitrogen atom in the tilted orientation and on Pd via the quinoline ring in the flat orientation. In the tilted orientation, the C-Cl bond is away from the surface of catalysts, which can avoid the hydrogenation of the C-Cl bond by the surface activated hydrogen species. A series of Au1?xPdx bimetallic catalysts were deposited on CeO2 nanorods by a facile electroless chemical deposition method. The Au1?xPdx catalysts with low Pd content delivered enhanced activity and improved chemoselectivity for the hydrogenation of halogenated quinolines. Highly dispersed Pd in the Au matrix of bimetallic catalysts with low Pd content triggers hydrogen activation on Pd sites and leads to the selective adsorption of halogenated quinolines on Au sites in the tilted orientation. The generated active hydrogen species can diffuse from Pd to Au sites for the hydrogenation of the tilted halogenated quinolines, resulting in suppressed dehalogenation and high chemoselectivity to the expected products.
One-pot synthesis of tetralin derivatives from 3-benzoylpropionic acids: Indium-catalyzed hydrosilylation of ketones and carboxylic acids and intramolecular cyclization
Sakai, Norio,Kobayashi, Taichi,Ogiwara, Yohei
supporting information, p. 1503 - 1505 (2015/11/24)
This reducing system was composed of a small amount (1 mol%) of In(OAc)3, Me2PhSiH, and I2 that effectively catalyzed the hydrosilylation of two different carbonyl groups, a ketone and a carboxylic acid found in 3-benzoylpropionic acids, followed by a subsequent intramolecular cyclization that led to the one-pot preparation of tetralin derivatives.
Centrally acting 6,7,8,9-tetrahydro-3H-benz(E)indole heterocyclics
-
, (2008/06/13)
A compound of Formula I STR1 or pharmaceutically acceptable salts of Formula I, where R1 is H, C1 -C3 alkyl, --(CH2)n CONH2 where n is 2 to 6, (CH2)n -1-(4,4-dimethylpiperidine-2
Centrally acting 6,7,8,9-tetrahydro-3H-benz(e)indole heterocyclics
-
, (2008/06/13)
A compound of Formula I STR1 or pharmaceutically acceptable salts of Formula I, where R 1 is H, C 1 -C 3 alkyl, --(CH 2) n CONH 2 where n is 2 to 6, (CH2) n -1-(4,4-dimethylpiperidine-2,6-dione-yl), or cyclopropylmethyl;R 2 is hydrogen, C 1 -C 8 alkyl, C
Neighboring Group Participation in Solvolysis. X. Dissection of Ar1-5 and Ar2-6 Pathways in Trifluoroacetolysis of 4-Arylbutyl 6-Methyl-2-naphthalenesulfonates
Ando, Takashi,Yamawaki, Junko,Saito, Yoshimasa,Takai, Yoshio,Yamataka, Hiroshi
, p. 2348 - 2356 (2007/10/02)
Trifluoroacetolysis rates and products were determined for eleven 4-(m- and p-substituted phenyl)butyl 6-methyl-2-naphthalenesulfonates.Most substrates solvolyze predominantly or even exclusively with aryl assisted (kΔ) pathway.Dissection of kΔ into Ar1-5 and Ar2-6 components was performed by means of quantitative 13C NMR study of suitably labeled p-methyl and p-fluoro derivatives; the results were 32.4percent Ar1-5 and 67.6percent Ar2-6 for the former and 43.3percent Ar1-5 and 56.7percent Ar2-6 for the latter.For other substrates the dissection was carried out by postulating two independent linear free energy relationships (LFER) for the two pathways determined by the above four partial rates.Ar2-6 is much prefered over Ar1-5 through the series; for the unsubstituted derivative 90.6percent Ar2-6 vs. 9.4percent Ar1-5 was determined.A completely different approach by means of non-linear regression analysis of kΔ as a sum of two independent LFER gave fairly different and rather unsettled results, limitations of such an approach being suggested.The characteristics of remote aryl participation are discussed based on the above data.
