- Synthesis of novel hybrid quinolino[4,3-b][1,5]naphthyridines and quinolino[4,3-b][1,5]naphthyridin-6(5H)-one derivatives and biological evaluation as topoisomerase I inhibitors and antiproliferatives
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The topoisomerase I enzymatic inhibition of hybrid quinolino [4,3-b] (Siegel et al., 2013; Antony et al., 2003) [1,5]naphthyridines and quinolino [4,3-b] (Siegel et al., 2013; Antony et al., 2003) [1,5]naphthyridin-6(5H)-ones was investigated. First, the synthesis of these fused compounds was performed by intramolecular [4 + 2]-cycloaddition reaction of functionalized aldimines obtained by the condensation of 3-aminopyridine and unsaturated aldehydes affording corresponding hybrid 5-tosylhexahydroquinolino [4,3-b] (Siegel et al., 2013; Antony et al., 2003) [1,5]naphthyridine and tetrahydroquinolino [4,3-b] (Siegel et al., 2013; Antony et al., 2003) [1,5]naphthyridin-6(5H)-one compounds with good to high general yields. Subsequent dehydrogenation led to the corresponding more unsaturated dihydro (Siegel et al., 2013; Antony et al., 2003) [1,5]naphthyridine and (Siegel et al., 2013; Antony et al., 2003) [1,5]naphthyridin-6(5H)-one derivatives in quantitative yields. The new polycyclic products show excellent-good activity as topoisomerase I (TopI) inhibitors that lead to TopI induced nicking of plasmids. This is consistent with the compounds acting as TopI poisons resulting in the accumulation of trapped cleavage complexes in the DNA. The cytotoxic effect on cell lines A549, SKOV3 and on non-cancerous MRC5 was also screened. Tetrahydroquinolino [4,3-b] (Siegel et al., 2013; Antony et al., 2003) [1,5]naphthyridin-6(5H)-one 9 resulted the most cytotoxic compound with IC50 values of 3.25 ± 0.91 μM and 2.08 ± 1.89 μM against the A549 cell line and the SKOV3 cell line, respectively. Also, hexahydroquinolino [4,3-b] (Siegel et al., 2013; Antony et al., 2003) [1,5]naphthyridine 8a and dihydroquinolino [4,3-b] (Siegel et al., 2013; Antony et al., 2003) [1,5]naphthyridine 10a showed good cytotoxicity against these cell lines. None of the compounds presented cytotoxic effects against non-malignant pulmonary fibroblasts (MRC-5).
- Alonso, Concepción,Knudsen, Birgitta R.,Martín-Encinas, Endika,Palacios, Francisco,Rubiales, Gloria,Selas, Asier,Tesauro, Cinzia
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- Palladium-Catalyzed Regioselective Syn-Chloropalladation-Olefin Insertion-Oxidative Chlorination Cascade: Synthesis of Dichlorinated Tetrahydroquinolines
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A palladium catalyzed cascade process involving syn-chloropalladation, intramolecular olefin insertion, and oxidative C-Cl bond formation reactions was demonstrated for the synthesis of dichlorinated tetrahydroquinolines in high yields (up to 93%). The N-propargyl arylamines having a tethered α,β-unsaturated carbonyl moiety underwent a regioselective syn-chloropalladation followed by a Heck-type reaction to deliver the tetrahydroquinoline scaffold. The rare insertion of the second chlorine atom was rationalized comprising a PdII/IV catalytic cycle and oxidative cleavage of the C-PdII bond.
- Vinoth, Perumal,Karuppasamy, Muthu,Vachan,Muthukrishnan, Isravel,Maheswari, C. Uma,Nagarajan, Subbiah,Pace, Vittorio,Roller, Alexander,Bhuvanesh, Nattamai,Sridharan, Vellaisamy
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- Direct Access to 9-Chloro-1 H-benzo[ b]furo[3,4- e]azepin-1-ones via Palladium(II)-Catalyzed Intramolecular syn-Oxypalladation/Olefin Insertion/sp2-C-H Bond Activation Cascade
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An efficient Pd(II)-catalyzed cascade approach was established for the synthesis of 9-chloro-1H-benzo[b]furo[3,4-e]azepin-1-ones starting from N-propargyl arylamines having a pendant α,β-unsaturated ester scaffold. The mechanism of this sequential process involved intramolecular syn-oxypalladation followed by olefin insertion and ortho sp2-C-Cl bond formation reactions. This high atom- and step-economical cascade sequence generated two heterocycle rings and three new bonds in a single synthetic operation.
- Karuppasamy, Muthu,Vachan,Vinoth, Perumal,Muthukrishnan, Isravel,Nagarajan, Subbiah,Ielo, Laura,Pace, Vittorio,Banik, Subrata,Maheswari, C. Uma,Sridharan, Vellaisamy
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p. 5784 - 5788
(2019/08/26)
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- Intramolecular Cycloaddition Approach to Fused Pyrazoles: Access to 4,5-Dihydro-2 H -pyrazolo[4,3- c ]quinolines, 2,8-Dihydroindeno[2,1- c ]pyrazoles, and 4,5-Dihydro-2 H -benzo[ e ]indazoles
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A straightforward and efficient method for the synthesis of pyrazoles fused with 1,2,3,4-tetrahydroquinoline, 2,3-dihydro-1 H -indene, or 1,2,3,4-tetrahydronaphthalene involves the formation of the tosylhydrazone from an aromatic substrate carrying aldehy
- Jash, Moumita,Das, Bimolendu,Sen, Suparna,Chowdhury, Chinmay
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p. 1511 - 1520
(2017/12/26)
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- Efficient synthesis of functionalized dihydroquinolines, quinolines and dihydrobenzo[b]azepine via an iron(iii) chloride-catalyzed intramolecular alkyne-carbonyl metathesis of alkyne tethered 2-amino benzaldehyde/acetophenone derivatives
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In this study we have developed an efficient synthesis of 1,2-dihydroquinoline and dihydrobenzo[b]azepine derivatives involving the iron(iii) chloride intramolecular alkyne-carbonyl metathesis reaction for the first time. Various functionalized 1,2-dihydroquinolines and dihydrobenzo[b]azepines were prepared from easily accessible substrates in the presence of environmentally friendly and inexpensive iron(iii) chloride (10 mol%) under mild conditions. The method is applicable to a wide range of substrates containing different functional groups and furnishing products in good to excellent yields. This methodology was further extended to the one-pot synthesis of 3-acyl quinolines via alkyne-carbonyl metathesis/detosylation/ aromatization of N-propargyl-2-aminobenzaldehyde/acetophenone derivatives by the addition of NaOH/EtOH. While many Lewis acid and Bronsted acid catalysts were investigated, anhydrous iron(iii) chloride turned out to be the best catalyst for this transformation.
- Jalal, Swapnadeep,Bera, Krishnendu,Sarkar, Soumen,Paul, Kartick,Jana, Umasish
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p. 1759 - 1770
(2014/03/21)
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- Synthesis of (Z)-1,2-dihydro-1-tosylbenzo[b]azepin-3-ones by two-step, one-pot gold-catalyzed tandem heterocyclization/Petasis-Ferrier rearrangement of 2-(N-(prop-2-ynyl)-N-tosylamino)benzaldehydes
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A two-step, one-pot synthetic method that relies on gold(I)-catalyzed tandem heterocyclization/Petasis-Ferrier rearrangement and Br?nsted acid-assisted debenzoxylation of 2-(N-(prop-2-ynyl)-N-tosylamino)benzaldehydes to prepare (Z)-1,2-dihydro-1-tosylbenzo[b]azepin-3-ones efficiently is reported. The reactions proceed rapidly under mild and operationally straightforward conditions for a wide variety of aldehyde substrates containing electron-withdrawing, electron-donating, and sterically demanding functional groups and afforded the corresponding benzo-fused azaheterocyclic products in moderate to excellent yields.
- Sze, Ella Min Ling,Koh, Ming Joo,Tjia, Yen Min,Rao, Weidong,Chan, Philip Wai Hong
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p. 5558 - 5565
(2013/07/04)
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- Lewis acid-catalyzed intramolecular [3+2] cycloaddition of cyclopropane 1,1-diesters with alkynes for the synthesis of cyclopenta[c]chromene skeletons
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An efficient method to construct cyclopenta[c]chromene skeletons by Lewis acid-catalyzed intramolecular [3+2] cycloaddition of cyclopropane 1,1-diesters with alkynes is presented. Two new fused cycles can be formed in one step in moderate to excellent yie
- Xia, Xiao-Feng,Song, Xian-Rong,Liu, Xue-Yuan,Liang, Yong-Min
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p. 1538 - 1541
(2012/08/08)
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- N-heterocyclic carbene-catalyzed cascade reaction involving the hydroacylation of unactivated alkynes
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The N-heterocyclic carbene (NHC)-catalyzed hydroacylation of unactivated alkynes to provide α,β-unsaturated ketones is reported. In addition, a rare case of an efficient and selective dually NHC-catalyzed cascade reaction involving the hydroacylation of a
- Biju, Akkattu T.,Wurz, Nathalie E.,Glorius, Frank
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supporting information; experimental part
p. 5970 - 5971
(2010/07/05)
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