20345-61-3Relevant articles and documents
Cyclobutanone mimics of penicillins: Effects of substitution on conformation and hemiketal stability
Johnson, Jarrod W.,Evanoff, Darryl P.,Savard, Marc E.,Lange, Gerald,Ramadhar, Timothy R.,Assoud, Abdeljalil,Taylor, Nicholas J.,Dmitrienko, Gary I.
, p. 6970 - 6982 (2008)
(Chemical Equation Presented) The tendency for carbocyclic analogues of penicillins to undergo hydrate and hemiketal formation is central to their ability to function as β-lactamase inhibitors. 2-Thiabicyclo[3.2.0]heptan- 6-one-4-carboxylates with alkoxy functionality at C3 have been prepared through two complementary diastereoselective substitution reactions following a highly stereoselective chlorination with sulfuryl chloride. We have found that carbocyclic analogues with 3β substituents favor an endo envelope conformation in solution, the solid state, and the gas phase, whereas those with 3α substituents adopt an exo envelope. Evidence from X-ray crystal structures and ab initio calculations suggests that an anomeric effect contributes to the large conformational preference of the tetrahydrothiophene ring that favors the C3 substituent in an axial orientation. In addition, the envelope conformation of the bicycle, which is determined by the stereochemistry of the C3 substituent, has a dramatic effect on the ability of the cyclobutanone to undergo hemiketal formation in methanol-d4.
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Minami,T. et al.
, p. 285 - 288 (1978)
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Semmelhack,M.F. et al.
, p. 1259 - 1262 (1978)
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Stereoisomers of oseltamivir-synthesis, in silico prediction and biological evaluation
Hajzer, Viktória,Fi?era, Roman,Latika, Attila,Durmis, Július,Kollár, Jakub,Frecer, Vladimír,Tu?eková, Zuzana,Miertu?, Stanislav,Kostolansky, Franti?ek,Vare?ková, Eva,?ebesta, Radovan
, p. 1828 - 1841 (2017/03/09)
Oseltamivir is an important antiviral drug, which possess three chirality centers in its structure. From eight possible stereoisomers, only two have been synthesized and evaluated so far. We describe herein the stereoselective synthesis, computational activity prediction and biological testing of another three diastereoisomers of oseltamivir. These isomers have been synthesized using stereoselective organocatalytic Michael addition, cyclization and reduction. Their binding to viral neuraminidase N1 of influenza A virus was evaluated by quantum-chemical calculations and their anti-influenza activities were tested by an in vitro virus-inhibition assay. All three isomers displayed antiviral activity lower than that of oseltamivir, however, one of the stereoisomers, (3S,4R,5S)-isomer, of oseltamivir showed in vitro potency towards the Tamiflu-sensitive influenza viral strain A/Perth/265/2009(H5N1) comparable to Tamiflu.
Synthesis and structure-activity relationship study of substituted caffeate esters as antinociceptive agents modulating the TREK-1 channel
Rodrigues, Nuno,Bennis, Khalil,Vivier, Delphine,Pereira, Vanessa,Chatelain, Franck C.,Chapuy, Eric,Deokar, Hemantkumar,Busserolles, Jér?me,Lesage, Florian,Eschalier, Alain,Ducki, Sylvie
supporting information, p. 391 - 402 (2014/03/21)
The TWIK-related K+ channel, TREK-1, has recently emerged as an attractive therapeutic target for the development of a novel class of analgesic drugs. It has been reported that TREK-1 -/- mice were more sensitive than wild-type mice to painful stimuli, suggesting that activation of TREK-1 could result in pain inhibition. Here we report the synthesis of a series of substituted caffeate esters (12a-u) based on the hit compound CDC 2 (cinnamyl 3,4-dihydroxyl-α-cyanocinnamate). These analogs were evaluated for their ability to modulate TREK-1 channel by electrophysiology and for their in vivo antinociceptive activity (acetic acid induced-writhing assay) leading to the identification a series of novel molecules able to activate TREK-1 and displaying potent analgesic activity in vivo.
