- A cascade process for directly converting nitriles (RCN) to cyanamides (RNHCN) via SO2F2-activated Tiemann rearrangement
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A simple, mild and practical process for the direct conversion of nitriles to cyanamides was newly discovered and exhibited a wide substrate scope as well as great functional group-tolerability (36 examples). In this efficient strategy, the in situ generated amidoximes obtained from the reaction of nitriles with hydroxylamine subsequently underwent Tiemann rearrangement, producing the corresponding cyanamides with great isolated yields under SO2F2. Additionally, the control experiments reportedly shed light on the tentative mechanism involved in the formation and elimination of the key intermediate: a sulfonyl ester.
- Zhang, Guofu,Zhao, Yiyong,Ding, Chengrong
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supporting information
p. 7684 - 7688
(2019/08/30)
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- 1, 2, 4-oxadiazole incorporated ketoprofen analogues in search of safer non-steroidal anti-inflammatory agents: Design, syntheses, biological evaluation and molecular docking Studies
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Background: Improving the gastrointestinal safety profile of Non-Steroidal Anti- Inflammatory Drugs (NSAIDs) is an important goal. An important strategy to develop NSAIDs with minimal Gastrointestinal (GI) toxicity is to target the COX-2 isoform with a se
- Ranjan, Chanda,Kumar, Jagdish,Sharma, Kalicharan,Akhter, Mymoona,Siddiqui, Anees A.,Chawla, Gita
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p. 590 - 601
(2018/06/06)
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- Synthesis method for benzamidine derivatives
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The invention discloses a synthesis method for benzamidine derivatives. According to the synthesis method disclosed by the invention, a reaction of preparing benzamidine derivatives from benzonitrile raw materials is completed in a green and efficient manner by using an ionic liquid-supported nano-metal catalyst, and the catalyst is high in activity and recoverable. Benzamidoxime is formed from benzonitrile and hydroxylamine hydrochloride, and then benzamidine is obtained through hydrogenation reduction under the catalysis of the ionic liquid-supported nano-metal catalyst.
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Paragraph 0009
(2017/05/04)
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- Structure-based design, synthesis and evaluation in vitro of arylnaphthyridinones, arylpyridopyrimidinones and their tetrahydro derivatives as inhibitors of the tankyrases
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Abstract The tankyrases are members of the PARP superfamily; they poly(ADP-ribosyl)ate their target proteins using NAD+ as a source of electrophilic ADP-ribosyl units. The three principal protein substrates of the tankyrases (TRF1, NuMA and axin) are involved in replication of cancer cells; thus inhibitors of the tankyrases may have anticancer activity. Using structure-based drug design and by analogy with known 3-arylisoquinolin-1-one and 2-arylquinazolin-4-one inhibitors, series of arylnaphthyridinones, arylpyridinopyrimidinones and their tetrahydro-derivatives were synthesised and evaluated in vitro. 7-Aryl-1,6-naphthyridin-5-ones, 3-aryl-2,6-naphthyridin-1-ones and 3-aryl-2,7-naphthyridin-1-ones were prepared by acid-catalysed cyclisation of the corresponding arylethynylpyridinenitriles or reaction of bromopyridinecarboxylic acids with β-diketones, followed by treatment with NH3. The 7-aryl-1,6-naphthyridin-5-ones were methylated at 1-N and reduced to 7-aryl-1-methyl-1,2,3,4-tetrahydro-1,6-naphthyridin-5-ones. Cu-catalysed reaction of benzamidines with bromopyridinecarboxylic acids furnished 2-arylpyrido[2,3-d]pyrimidin-4-ones. Condensation of benzamidines with methyl 1-benzyl-4-oxopiperidine-3-carboxylate and deprotection gave 2-aryl-5,6,7,8-tetrahydropyrido[4,3-d]pyrimidin-4-ones, aza analogues of the known inhibitor XAV939. Introduction of the ring-N in the arylnaphthyridinones and the arylpyridopyrimidinones caused >1000-fold loss in activity, compared with their carbocyclic isoquinolinone and quinazolinone analogues. However, the 7-aryl-1-methyl-1,2,3,4-tetrahydro-1,6-naphthyridin-5-ones showed excellent inhibition of the tankyrases, with some examples having IC50 = 2 nM. One compound (7-(4-bromophenyl)-1-methyl-1,2,3,4-tetrahydro-1,6-naphthyridin-5-one) showed 70-fold selectivity for inhibition of tankyrase-2 versus tankyrase-1. The mode of binding was explored through crystal structures of inhibitors in complex with tankyrase-2.
- Kumpan, Katerina,Nathubhai, Amit,Zhang, Chenlu,Wood, Pauline J.,Lloyd, Matthew D.,Thompson, Andrew S.,Haikarainen, Teemu,Lehti?, Lari,Threadgill, Michael D.
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supporting information
p. 3013 - 3032
(2015/08/03)
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- Practical synthesis of N -substituted cyanamides via tiemann rearrangement of amidoximes
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A facile and general synthesis of various N-substituted cyanamides was accomplished by the Tiemann rearrangement of amidoximes with benzenesulfonyl chlorides (TsCl or o-NsCl) and DIPEA.
- Lin, Chia-Chi,Hsieh, Tsung-Han,Liao, Pen-Yuan,Liao, Zhen-Yuan,Chang, Chih-Wei,Shih, Yu-Chiao,Yeh, Wen-Hsiung,Chien, Tun-Cheng
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supporting information
p. 892 - 895
(2014/03/21)
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- An Efficient Synthesis of 2-Substituted Quinazolin-4(3 H)-ones Catalyzed by Iron(III) Chloride
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A simple and highly efficient synthesis of 2-substituted quinazolin-4(3H)-ones by the iron(III) chloride catalyzed reaction of isatoic anhydride with various amidoxime derivatives was developed. Several aryl and alkyl amidoximes were screened to demonstra
- Mekala, Ramamohan,Akula, Raghunadh,Kamaraju, Raghavendra Rao,Bannoth, Chandrasekhar Kothapalli,Regati, Sridhar,Sarva, Jayaprakash
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supporting information
p. 821 - 826
(2014/04/03)
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- Synthesis and in vivo anticancer and antiangiogenic effects of novel thioxothiazolidin-4-one derivatives against transplantable mouse tumor
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A series of novel thioxothiazolidin-4-one derivatives 5(a-g) were synthesized by the coupling of different amines containing aliphatic, substituted aromatic, and heterocyclic moieties, such as oxadiazol, pyrazole, isoxazole, and piperazine with 2-(5-(4-chlorophenyl)furan-2-yl)methylene)-4-oxo- 2-thioxothiazolidin-3-yl)acetic acid. All compounds were characterized by 1H NMR, LCMS, FTIR and elemental analysis. In this study, we investigated the possibility that these novel thioxothiazolidin-4-one derivatives 5(a-g) inhibits tumor growth and tumor induced angiogenesis using mouse Ehrlich Ascites Tumor (EAT) as a model system. Our results demonstrated that the compounds significantly reduced ascites tumor volume, cell number, and increased the life span of EAT-bearing mice. In addition, the compounds manifested strong antiangiogenic effects and suppressed tumor induced endothelial proliferation in the mice peritoneum. From our findings, it is noted that the derivatives 5(a-e) may be possible candidates for anticancer therapy with the ability to inhibit tumor angiogenesis and tumor cell proliferation.
- Chandrappa,Chandru,Sharada,Vinaya,Ananda Kumar,Thimmegowda,Nagegowda,Karuna Kumar,Rangappa
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experimental part
p. 236 - 249
(2011/01/12)
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- IMPROVED PROCESS FOR THE PREPARATION OF 4-(BENZIMIDAZOLYLMETHYLAMINO)-BENZAMIDES AND THE SALTS THEREOF
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The invention relates to a process for preparing an optionally substituted 4-benzimidazol- 2-ylmethylamino)-benzamidine, characterised in that (a) an optionally correspondingly substituted diaminobenzene is condensed with 2 [4- (1,2,4-oxadiazol-5-on-3-yl)-phenylamino]-acetic acid, (b) i) the product thus obtained is hydrogenated and ii) optionally the amidino group is carbonylated, without isolating the intermediate product of the hydrogenation beforehand; as well as a process for preparing a salt of an optionally substituted 4(benzimidazol-2-ylmethylamino)-benzamidine, wherein (a) an optionally correspondingly substituted diaminobenzene is condensed with 2-[4-(1,2,4-oxadiazol-5-on-3-yl)-phenylamino]-acetic acid, (b) the product thus obtained is hydrogenated, and (c) i) optionally the amidino group is carbonylated and ii) without prior isolation of the intermediate product of the carbonylation the desired salt is isolated.
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Page/Page column 18-19
(2010/11/27)
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- POLYCYCLIC OXADIAZOLES OR I SOXAZOLES AND THEIR USE AS SlP RECEPTOR LIGANDS
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Disclosed are polycyclic compounds of formula I which are useful as sphingosine-1 -phosphate (S 1 P) receptor ligands, particularly as immunosuppressants.
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Page/Page column 8
(2008/06/13)
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