- Photo-Promoted Decarboxylative Alkylation of α, β-Unsaturated Carboxylic Acids with ICH2CN for the Synthesis of β, γ-Unsaturated Nitriles
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An efficient, catalyst/photocatalyst-free, and cost-effective methodology for the decarboxylative alkylation of α,β-unsaturated carboxylic acids to synthesize β,γ-unsaturated nitriles has been developed. The reaction proceeded in an environmentally benign atmosphere of blue light-emitting diode irradiation with K2CO3 and water at room temperature. The methodology worked for a wide range of substrates (22 examples) with up to 83% yield. The protocol is also compatible for gram-scale synthesis.
- Pan, Chunxiang,Yang, Chunhui,Li, Kangkui,Zhang, Keyang,Zhu, Yuanbin,Wu, Shiyuan,Zhou, Yongyun,Fan, Baomin
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supporting information
p. 7188 - 7193
(2021/10/01)
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- Palladium(II)-Catalyzed Oxidative Decarboxylative [2 + 2 + 1] Annulation of Cinnamic Acids with Alkynes: Access to Polysubstituted Pentafulvenes
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An unprecedented palladium(II)-catalyzed oxidative decarboxylative [2 + 2 + 1] annulation of cinnamic acids with alkynes has been developed for the synthesis of polysubstituted pentafulvenes. Ag2CO3 and DMSO are essential for the reaction. This protocol features readily available starting materials, a wide substrate scope, and moderate to excellent yields. Moreover, various significant frameworks can be easily obtained from the late-stage transformations of pentafulvenes via oxidation, reduction, and Scholl-type reaction.
- Peng, Shiyong,Chen, Nuan,Zhang, Hong,He, Min,Li, Hongguang,Lang, Ming,Wang, Jian
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supporting information
p. 5589 - 5593
(2020/07/08)
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- Dual-targeting Rutaecarpine-NO donor hybrids as novel anti-hypertensive agents by promoting release of CGRP
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CGRP, known as the most potent vasodilator substance, plays an important role in hypertension initiation and development. TRPV1 and TRPA1 are critical in promoting the synthesis and release of CGRP, thereby regulating the cardiovascular tone. Rutaecarpine exhibits potent vasodilator and hypertensive effects by stimulating CGRP synthesis and release via activation of TRPV1. And NO has been shown to react with H2S in vivo to form HNO, thereby activating HNO-TRPA1-CGRP pathway. Inspired by combination therapy, 11 rutaecarpine-furoxan hybrids were designed, synthesized and evaluated. The results demonstrated that most hybrids exerted comparable or improved vasodilator activities. Among which, 13a is the most potent both ex vivo (EC50 = 13.1 nM) and in vivo. Mechanistic studies revealed that the vasodilator and anti-hypertensive effects of the hybrids might involve the promotion of CGRP release via dual activation of TRPV1 and TRPA1. This work suggests that dual-targeted hybrids might be an effective and promising approach to discover and develop novel anti-hypertensive drugs.
- Ma, Jinjin,Chen, Lan,Fan, Jinbao,Cao, Wei,Zeng, Guangyao,Wang, Yajing,Li, Yuanjian,Zhou, Yingjun,Deng, Xu
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supporting information
p. 146 - 153
(2019/02/27)
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- Rational modifications on a benzylidene-acrylohydrazide antiviral scaffold, synthesis and evaluation of bioactivity against Chikungunya virus
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Chikungunya virus is a re-emerging arbovirus transmitted to humans by Aedes mosquitoes, responsible for an acute febrile illness associated with painful and debilitating arthralgia, which can persist for several months or become chronic. Over the past few years, infection with this virus has spread worldwide with a previously unknown virulence. No specific antiviral treatments nor vaccines are currently available against this important pathogen. Starting from the structure of a class of selective anti-CHIKV agents previously identified in our research group, different modifications to this scaffold were rationally designed, and 69 novel small-molecule derivatives were synthesised and evaluated for their inhibition of Chikungunya virus replication in Vero cells. Further structure-activity relationships associated with this class of antiviral agents were elucidated for the original scaffolds, and novel antiviral compounds with EC50 values in the low micromolar range were identified. This work provides the foundation for further investigation of these new structures as antivirals against Chikungunya virus.
- Giancotti, Gilda,Cancellieri, Michela,Balboni, Andrea,Giustiniano, Mariateresa,Novellino, Ettore,Delang, Leen,Neyts, Johan,Leyssen, Pieter,Brancale, Andrea,Bassetto, Marcella
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supporting information
p. 56 - 68
(2018/03/06)
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- Chiral phosphoric acid catalyzed enantioselective annulation of acyclic enecarbamates to: In situ -generated ortho -quinone methides
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The first organocatalytic asymmetric reaction of acyclic enecarbamates with o-quinone methides is disclosed. BINOL-based phosphoric acid catalysts were found to be suitable for the annulation reaction. With 10 mol% of the TRIP catalyst, high yields as well as excellent diastereo- and enantioselectivities are achieved for a variety of 2,3,4-trisubstituted chroman products.
- Gharui, Chandan,Singh, Shreya,Pan, Subhas Chandra
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supporting information
p. 7272 - 7276
(2017/09/25)
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- A novel serine racemase inhibitor suppresses neuronal over-activation in vivo
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Serine racemase (SRR) is an enzyme that produces D-serine from L-serine. D-Serine acts as an endogenous coagonist of NMDA-type glutamate receptors (NMDARs), which regulate many physiological functions. Over-activation of NMDARs induces excitotoxicity, which is observed in many neurodegenerative disorders and epilepsy states. In our previous works on the generation of SRR gene knockout (Srr-KO) mice and its protective effects against NMDA- and Aβ peptide-induced neurodegeneration, we hypothesized that the regulation of NMDARs’ over-activation by inhibition of SRR activity is one such therapeutic strategy to combat these disease states. In the previous study, we performed in silico screening to identify four compounds with inhibitory activities against recombinant SRR. Here, we synthesized 21 derivatives of candidate 1, one of four hit compounds, and performed screening by in vitro evaluations. The derivative 13J showed a significantly lower IC50 value in vitro, and suppressed neuronal over-activation in vivo.
- Mori, Hisashi,Wada, Ryogo,Takahara, Satoyuki,Horino, Yoshikazu,Izumi, Hironori,Ishimoto, Tetsuya,Yoshida, Tomoyuki,Mizuguchi, Mineyuki,Obita, Takayuki,Gouda, Hiroaki,Hirono, Shuichi,Toyooka, Naoki
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p. 3736 - 3745
(2017/06/13)
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- Synthesis and biological evaluation of N-cinnamoyl and mandelate metformin analogues
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A series of N,N-dimethyl-N1-[3-(substituted phenyl)-1-oxo-2-propenyl]biguanides were synthesized by coupling a solution of metformin in pyridine with different cinnamoyl chloride derivatives in ether for 3 h in addition to synthesis of some five molecules of metformin-mandelates. All the synthesized cinnamoyl metformins and a few metformin-mandelates were characterized by IR, NMR and Mass spectroscopic techniques. All the synthesized compounds were also evaluated for their antioxidant activity by DPPH scavenging method and nitric oxide scavenging method. All the compounds exhibited good antioxidant activity.
- Anitha Kumari,Bharathi,Prabhu,Ponnudurai
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p. 1895 - 1898
(2016/07/06)
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- Copper catalyzed oxygen assisted C(CNOH)-C(alkyl) bond cleavage: A facile conversion of aryl/aralkyl/vinyl ketones to aromatic acids
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A novel copper-catalyzed aerobic oxidative C(NOH)-C(alkyl) bond cleavage reaction of aryl/aralkyl/vinyl ketones for the synthesis of aromatic/acrylic acids is described. A series of ketones having aryl/aralkyl/vinyl at the one end and methyl to any higher alkyl at the other end can be selectively cleaved and converted into the corresponding acids via oxime intermediates.
- Sathyanarayana, Pochampalli,Ravi, Owk,Muktapuram, Prathap Reddy,Bathula, Surendar Reddy
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supporting information
p. 9681 - 9685
(2015/09/28)
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- Ansa-Ruthenium(II) Complexes of R2NSO2DPEN-(CH2)n(η6-Aryl) Conjugate Ligands for Asymmetric Transfer Hydrogenation of Aryl Ketones
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New 3rd generation designer ansa-ruthenium(II) complexes featuring N,C-alkylene-tethered N,N-dialkylsulfamoyl-DPEN/η6-arene ligands, exhibited good catalytic performance in the asymmetric transfer hydrogenation (ATH) of various classes of (het)aryl ketones in formic acid/triethylamine mixture. In particular, benzo-fused cyclic ketones furnished 98 to >99.9% ee using a low catalyst loading.
- Ki?ic, Andrea,Stephan, Michel,Mohar, Barbara
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supporting information
p. 2540 - 2546
(2015/08/18)
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- Design, synthesis and biological evaluation of cinnamic acyl shikonin derivatives
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Inducing apoptosis is an important and promising therapeutic approach to overcome cancer. Here, we described a series of novel synthesized compounds, cinnamic acyl shikonin derivatives (1b-19b), which were synthesized starting from shikonin and cinnamic acids, which exhibit anticancer activity via inducing apoptosis in vitro. Our flow cytometry results showed that compound 8b((E)-1-(5,8-dihydroxy-1,4-dioxo-1,4-dihydronaphthalen-2-yl)-4-methylpent -3-enyl-3-(3-(trifluoromethyl) phenyl)acrylate) (IC50=0.69, 0.65, 1.62 μm for human SW872-s, A875 and A549 cell lines, respectively) exhibited conspicuous anticancer activities and has low cell toxicity in vitro. Therefore, we considered that compound 8b is potentially to be a candidate of anticancer agent. The proliferation inhibitory effect of compound 8b was associated with its apoptosis-inducing effect by activating caspase-3, caspase-7, caspase-9, and PARP. When the level of cleaved caspase-3, cleaved caspase-7, cleaved caspase-9, and cleaved PARP are rise, apoptosis of cancer cells will be induced.
- Lin, Hong-Yan,Chen, Wei,Shi, Jing,Kong, Wen-Yao,Qi, Jin-Liang,Wang, Xiao-Ming,Yang, Yong-Hua
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p. 275 - 283
(2013/03/13)
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- Improved synthesis of natural ester sintenin and its analogues via Wittig reaction
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The synthesis of a cytotoxic natural ester sintenin (7a) and twenty eight of its analogues including nitrogen-containing heterocyclic indole moiety (7b-7t), saturated (10a-10d) and unsaturated (10e-10h) amides were carried out by convenient route via one-pot Wittig reaction in aqueous medium with improved yield. A systematic structure activity relationship of sintenin ester was designed by chemically modified derivatives in order to get better cytotoxicity.
- Sharma, Mukul,Rajesh, U. Chinna,Rawat, Diwan S.
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p. 1853 - 1860
(2014/01/17)
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- The design, synthesis and in vitro immunosuppressive evaluation of novel isobenzofuran derivatives
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The synthesis and biological evaluation of a series of novel isobenzofuran-based compounds are described. The compounds were evaluated for their immunosuppressive effects of T-cell proliferation and IMPDH type II inhibitor activity in vitro, as well as their structure-activity relationships were assessed. Several compounds demonstrated highly efficacious immunosuppressive properties, especially compounds 2d, 2e, 2h and 2j, which were superior to MPA, while compounds 2k, 2m, 2n, 4c and 5d exhibited an equipotent inhibitory activity compared to MPA. Generally, it was obviously demonstrated that α,β-unsaturated amides proved more potent than the diamide and urea series. The present study provides a guide for further research on development of safe and effective immunosuppressive agents.
- Yang, Na,Wang, Qing-He,Wang, Wen-Qian,Wang, Jian,Li, Feng,Tan, Shen-Peng,Cheng, Mao-Sheng
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body text
p. 53 - 56
(2012/02/16)
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- Synthesis and anticancer activity of 13-membered cyclic enediynes
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We herein describe the synthesis of 15 novel 13-membered cyclic enediyne derivatives using simple and straightforward approach. Representative examples were screened for their anticancer activities on 60 different human tumor cell lines representing various histologies viz. leukemia, melanoma, and cancers of lung, colon, kidney, ovary, breast, prostate, and central nervous system. The enediyne derivatives with halogen substitutions, especially fluorides were found to be active against most of the cell lines. The initial results indicates marginal to good inhibition for the growth of tumor cells for several cell lines, which shows the potential of these class of compound towards anticancer application. 15 novel 13-membered cyclic enediyne derivatives using a simple and straightforward approach are synthesized. The initial results show the potential of this class of compounds towards anticancer application. Copyright
- Sharma, Mukul,Joshi, Mukesh C,Kumar, Vineet,Malhotra, Sanjay V.,Rawat, Diwan S.
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scheme or table
p. 567 - 571
(2012/06/30)
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- Synthesis, molecular modeling, and biological evaluation of cinnamic acid metronidazole ester derivatives as novel anticancer agents
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A series of novel cinnamic acid metronidazole ester derivatives have been designed and synthesized, and their biological activities were also evaluated as potential EGFR and HER-2 kinase inhibitors. Compound 3h showed the most potent biological activity (IC50 = 0.62 μM for EGFR and IC50 = 2.15 μM for HER-2). Docking simulation was performed to position compound 3h into the EGFR active site to determine the probable binding model. Antiproliferative assay results demonstrated that some of these compounds possessed good antiproliferative activity against MCF-7. Compound 3h with potent inhibitory activity in tumor growth inhibition may be a potential anticancer agent.
- Qian, Yong,Zhang, Hong-Jia,Zhang, Hao,Xu, Chen,Zhao, Jing,Zhu, Hai-Liang
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experimental part
p. 4991 - 4996
(2010/09/05)
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- The discovery and synthesis of novel adenosine receptor (A2A) antagonists
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In high throughput screening of our file compounds, a novel structure 1 was identified as a potent A2A receptor antagonist with no selectivity over the A1 adenosine receptor. The structure-activity relationship investigation using 1 as a template lead to identification of a novel class of compounds as potent and selective antagonists of A2A adenosine receptor. Compound 26 was identified to be the most potent A2A receptor antagonist (Ki = 0.8 nM) with 100-fold selectivity over the A1 adenosine receptor.
- Matasi, Julius J.,Caldwell, John P.,Hao, Jinsong,Neustadt, Bernard,Arik, Leyla,Foster, Carolyn J.,Lachowicz, Jean,Tulshian, Deen B.
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p. 1333 - 1336
(2007/10/03)
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- Novel titanium(IV) chloride catalyzed olefination of aldehydes: A simple and convenient synthesis of trans-cinnamic acids
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A variety of aromatic aldehydes were stereoselectively transformed into (E)-cinnamic acids via the reaction with ethyl bromoacetate and triphenylphosphine in the presence of catalytic amount of titanium tetrachloride, followed by hydrolysis and crystallization.
- Basavaiah, Deevi,Jaganmohan Rao, Anumolu
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p. 195 - 201
(2007/10/03)
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- Syntheses and biological activities of pyranyl-substituted cinnamates
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Twenty-two kinds of pyranyl-substituted cinnamates were synthesized by the reaction of 4-hydroxy-6-(2-phenylethyl)-2H-pyran-2-one or 4-hydroxy-6-methyl-2H-pyran-2-one (HMP) with a variety of substituted cinnamic acids, and their antifungal and plant growth inhibitory activities were investigated. Among the compounds prepared, 6-methyl-2-oxo-2H-pyran-4-yl 3-(4-isopropylphenyl)propenoate (H5) showed the strongest antifungal activity against Rhizoctonia solani and Sclerotium dellfinii, and 6-methyl-2-oxo-2H-pyran-4-yl 3-(2-methylphenyl)propenoate (H2) had the highest plant growth inhibitory activity toward Brassica rapa.
- Zhu, Jun,Majikina, Motoji,Tawata, Shinkichi
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p. 161 - 163
(2007/10/03)
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