- Design, synthesis and biological evaluation of Tozadenant analogues as adenosine A2A receptor ligands
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With the aim to obtain potent adenosine A2A receptor (A2AR) ligands, a series of eighteen derivatives of 4-hydroxy-N-(4-methoxy-7-morpholin-4-yl-1,3-benzo[d]thiazol-2-yl)-4-methylpiperidine-1-carboxamide (SYN-115, Tozadenant) were designed and synthesized. The target compounds were obtained by a chemical building block principle that involved reaction of the appropriate aminobenzothiazole phenyl carbamates with either commercially available or readily synthesized functionalized piperidines. Their affinity and subtype selectivity with regard to human adenosine A1-and A2A receptors were determined using radioligand binding assays. Ki values for human A2AR ranged from 2.4 to 38 nM, with more than 120-fold selectivity over A1 receptors for all evaluated compounds except 13k which had a Ki of 361 nM and 18-fold selectivity. The most potent fluorine-containing derivatives 13e, 13g and 13l exhibited Ki values of 4.9 nM, 3.6 nM and 2.8 nM for the human A2AR. Interestingly, the corresponding values for rat A2AR were found to be four to five times higher. Their binding to A2AR was further confirmed by radiolabeling with 18F and in vitro autoradiography in rat brain slices, which showed almost exclusive striatal binding and complete displacement by the A2AR antagonist ZM 241385. We conclude that these compounds represent potential candidates for the visualization of the A2A receptor and open pathways to novel therapeutic treatments of neurodegenerative disorders or cancer.
- Renk, Dana R.,Skraban, Marcel,Bier, Dirk,Schulze, Annette,Wabbals, Erika,Wedekind, Franziska,Neumaier, Felix,Neumaier, Bernd,Holschbach, Marcus
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- Divergent, Stereospecific Mono- and Difluoromethylation of Boronic Esters
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There is considerable interest in incorporating fluorine into agrochemicals and pharmaceuticals to improve their biological properties. Whilst a number of methods have been reported for installing CH2F and CHF2 groups, they are mainly limited to radical reactions, which are invariably racemic. Herein, we report the divergent, stereospecific reaction of fluoroiodomethyllithium with boronic esters to give α-fluoro-boronic esters. These unique intermediates can be readily transformed into the corresponding mono- or difluoromethylated compounds through proto- or fluorodeboronation, respectively. The use of the highly unstable fluoroiodomethyllithium was key to allowing rapid 1,2-migration over competing decomposition of the carbanion. DFT calculations informed and supported the experimental findings.
- Aggarwal, Varinder K.,Fasano, Valerio,Noble, Adam,Winter, Nils
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p. 8502 - 8506
(2020/03/30)
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- Maximizing ER-α Degradation Maximizes Activity in a Tamoxifen-Resistant Breast Cancer Model: Identification of GDC-0927
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The further optimization of ER-α degradation efficacy of a series of ER modulators by refining side-chain substitution led to efficacious selective estrogen receptor degraders (SERDs). A fluoromethyl azetidine group was found to be preferred and resulted
- Kahraman, Mehmet,Govek, Steven P.,Nagasawa, Johnny Y.,Lai, Andiliy,Bonnefous, Celine,Douglas, Karensa,Sensintaffar, John,Liu, Nhin,Lee, Kyoungjin,Aparicio, Anna,Kaufman, Josh,Qian, Jing,Shao, Gang,Prudente, Rene,Joseph, James D.,Darimont, Beatrice,Brigham, Daniel,Heyman, Richard,Rix, Peter J.,Hager, Jeffrey H.,Smith, Nicholas D.
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supporting information
p. 50 - 55
(2019/01/15)
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- PYRAZOLE DERIVATIVES
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A compound represented by formula (I): (wherein Ar1 represents a phenyl group which may have 1 to 3 substituents, or a non-substituted 5- or 6-membered aromatic heterocyclic group; Ar2 represents (i) a non-substituted phenyl group, (ii) a phenyl group which has been substituted by a lower alkyl group having 1 to 3 groups or atoms selected from among a carbamoyl group, an amino group, a hydroxyl group, a lower alkoxy group, and a halogen atom, or (iii) a 5- or 6-membered nitrogen-containing aromatic heterocyclic group which has been substituted by 1 to 3 groups or atoms selected from among a lower alkyl group, a lower alkynyl group, a lower alkanoyl group, a carbamoyl group, a cyano group, an amino group, a hydroxyl group, a lower alkoxy group, and a halogen atom; and X represents a group represented by formula (II): (wherein the ring structure represents a 4- to 7-membered heterocyclic group which may have, in addition to the nitrogen atom shown in formula (II), one heteroatom selected from among nitrogen, oxygen, and sulfur, and which may be substituted by 1 to 4 groups or atoms selected from among a lower alkyl group, a carbamoyl group, an amino group, a hydroxyl group, a lower alkoxy group, an oxo group, a lower alkanoyl group, a lower alkylsulfonyl group, and a halogen atom)), a salt thereof, a solvate of the compound or the salt, and a drug.
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Page/Page column 46-47
(2010/11/26)
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- PYRAZOLE DERIVATIVE
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A compound represented by Formula (I): wherein Ar1 represents Formula (II): Ar2 represents a 5- or 6-membered aromatic heterocyclic group which may be substituted; and X represents Formula (III): a salt thereof, or a solvate of the compound or the salt. A potent platelet aggregation suppressant which does not inhibit COX-1 and COX-2 is provided.
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Page/Page column 45
(2010/11/27)
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- FIVE-MEMBERED HETEROCYCLIC DERIVATIVE
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The present invention relates to a compound represented by formula (I): a salt of the compound, or a solvate of the compound or the salt; a drug containing any of the compounds, the salts, and the solvates; a preventive and/or therapeutic agent for an ischemic disease containing any of the compounds, the salts, and the solvates; and a platelet coagulation inhibitor containing any of the compounds, the salts, and the solvates. The compound of the present invention is useful as a strong platelet coagulation inhibitor without inhibiting COX-1 or COX-2.
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Page/Page column 57
(2010/11/08)
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- Synthesis of [18F]FA-4 and [11C]pipzA-4 as radioligands for the high affinity choline uptake system
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We have prepared two radiolabelled analogues of hemicholinium-3 (HC-3) as potential in vivo tracers of the sodium dependent high affinity choline uptake (SDHAChU) system. Thus, 4-[1-hydroxy-2-(4-[18F]fluoromethylpiperidinyl)ethyl]-4'-[1-hydroxy-2-(4 -methylpiperidinyl)ethyl]biphenyl ([18F]FA-4) and 4-[1-hydroxy-2-(4-11C]methylpiperazinyl)ethyl]-4'-[1-hydroxy-2-(4 -methylpiperidinyl)]biphenyl ([11C]pipzA-4) have been synthesized. [18F]FA-4 was prepared by reaction of 4-[18F]fluoromethylpiperidine with 4-(α-bromoacetyl)-4'-(4-methylpiperidinylacetyl)biphenyl followed by reduction of the keto groups to alcohols with NaBH4. The total synthesis time was 300 minutes and [18F]FA-4 was obtained with a specific activity of 5.6 GBq/μmol (EOS) and an overall decay corrected radiochemical yield of 3.1 ± 0.6%. [11C]pipzA-4 was prepared by reaction of [11C]methyl triflate with 4-[1-hydroxy-2-piperazinyl)ethyl]-4'-[1-hydroxy-2-(4 -methylpiperidinyl)ethyl]biphenyl. The total synthesis time was 25 minutes and [11C]pipzA-4 was obtained with a specific activity of 13.7 GBq/μmol (EOS) and an overall decay corrected radiochemical yield of 19.5 ± 2.2%.
- Gilissen,Bormans,De Groot,Verbruggen
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p. 1289 - 1300
(2007/10/03)
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