- HETEROARYL COMPOUNDS AND THEIR USE AS MER INHIBITORS
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Compounds of formula (I) [Formula should be inserted here] and a pharmaceutically acceptable salt thereof, wherein A, R1, R2, R3, R4, R5, R6, R7, R24, X, L, n and p are as defined in the specification, are useful for treating or preventing Mer tyrosine kinase receptor modulated disease or conditions. Also described are pharmaceutical compositions of compounds of formula (I), and methods for using such compounds and compositions.
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Paragraph 1126; 1939
(2018/04/27)
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- A protection strategy substantially enhances rate and enantioselectivity in ω-transaminase-catalyzed kinetic resolutions
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The kinetic resolution of 3-aminopyrrolidine (3AP) and 3-aminopiperidine (3APi) with ω-transaminases was facilitated by the application of a protecting group concept. 1-N-Cbz-protected 3-aminopyrrolidine could be resolved with >99% ee at 50% conversion, the resolution of 1-N-Boc-3-aminopiperidine yielded 96% ee at 55% conversion. The reaction rate was up to 50-fold higher by using protected substrates. Most importantly, enantioselectivity increased remarkably after carbamate protection compared to the unprotected substrates (86 vs. 99% ee). Surprisingly, benzyl protection of 3AP had no influence on enantioselectivity. A possible explanation for this observation could be the different flexibility of the benzyl- or carbamate-protected 3AP as confirmed by NMR spectroscopy.
- Hoehne, Matthias,Robins, Karen,Bornscheuer, Uwe T.
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body text
p. 807 - 812
(2009/04/10)
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- Structure-activity relationships of adenosines with heterocyclic N6-substituents
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Two series of N6-substituted adenosines with monocyclic and bicyclic N6 substituents containing a heteroatom were synthesized in good yields. These derivatives were assessed for their affinity ([3H]CPX), potency, and intrinsic activity (cAMP accumulation) at the A1 adenosine receptor in DDT1 MF-2 cells. In the monocyclic series, the N6-tetrahydrofuran-3-yl and thiolan-3-yl adenosines (1 and 26, respectively) were found to possess similar activities, whereas the corresponding selenium analogue 27 was found to be more potent. A series of nitrogen containing analogues showed varying properties, N6-((3R)-1-benzyloxycarbonylpyrrolidin-3-yl)adenosine (30) was the most potent at the A1AR; IC50 = 3.2 nM. In the bicyclic series, the effect of a 7-azabicyclo[2.2.1]heptan-2-yl substituent in the N6-position was explored. N6-(7-Azabicyclo[2.2.1]heptan-2-yl)adenosine (38) proved to be a reasonably potent A1 agonist (Ki = 51 nM, IC50 = 35 nM) while further substitution on the 7″-nitrogen with tert-butoxycarbonyl (31, IC50 = 2.5 nM) and 2-bromobenzyloxycarbonyl (34, IC50 = 9.0 nM) gave highly potent A1AR agonists.
- Ashton,Aumann, Kylee M.,Baker, Stephen P.,Schiesser, Carl H.,Scammells, Peter J.
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p. 6779 - 6784
(2008/04/07)
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- Process for making 3-amino-pyrolidine derivatives
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The invention is concerned with a process for making a compound of formula STR1 wherein R1 is hydrogen, alkyl, cyclo-alkyl, alkenyl, aryl or an amino protecting group; and R2, R3 each independently is hydrogen, alkyl, cyclo-alkyl, alkenyl or aryl; by reacting a compound of the formula STR2 wherein X is a protected hydroxy group; with R1 NH2 to form a compound of formula STR3 wherein X and R1 are described herein above; and then reacting the compound of formula III with R2 R3 NH under pressure to form the compound of formula I. These compounds are valuable intermediates useful in making cephalosporin derivatives.
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- Quinolone antibacterial agents. Synthesis and structure-activity relationships of a series of amino acid prodrugs of racemic and chiral 7-(3- amino-1-pyrrolidinyl)quinolones. Highly soluble quinolone prodrugs with in vivo pseudomonas activity
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A series of amino acid prodrugs of racemic and chiral 7-(3-amino-1- pyrrolidinyl)-6-fluoro-1,8-naphthyridine-3-carboxylic acids, 1-cyclopropyl- 6,8-difluoro-3-quinolinecarboxylic acids, 1-cyclopropyl-6-fluoro-3- quinolinecarboxylic acids, and 5-amino-1-cyclopropyl-6,8-difluoro-3- quinolinecarboxylic acids have been prepared and evaluated for comparative antibacterial activity. Compounds were prepared by acylation of the 3-amino group of the pyrrolidine with common amino acids using standard peptide chemistry. This series has been compared with the parent compounds for antibacterial activity in vitro and in vivo as well as for comparative solubility. The amino acid analogues were less active in vitro, but had equal or increased efficacy in vivo. Indeed, it was proven that these compounds, which were stable to acid and base under the reaction conditions for their preparation, were rapidly cleaved in serum to give the parent quinolones. The amino acid derivatives showed a 3-70 times improved solubility when compared to the parent compounds. The most active compound of the series was [S- (R*,R*)]-7-[3-[(2-amino-1-oxopropyl)-amino]-1-pyrrolidinyl]-1-cyclopropyl- 6-fluoro-1,4-dihydro-4-oxo-1,8-naphthyridine-3-carboxylic acid (PD 131112).
- Sanchez,Domagala,Heifetz,Priebe,Sesnie,Trehan
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p. 1764 - 1773
(2007/10/02)
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