84794-38-7Relevant academic research and scientific papers
Interrupted Baeyer–Villiger Rearrangement: Building A Stereoelectronic Trap for the Criegee Intermediate
Vil', Vera A.,dos Passos Gomes, Gabriel,Bityukov, Oleg V.,Lyssenko, Konstantin A.,Nikishin, Gennady I.,Alabugin, Igor V.,Terent'ev, Alexander O.
supporting information, p. 3372 - 3376 (2018/02/28)
The instability of hydroxy peroxyesters, the elusive Criegee intermediates of the Baeyer–Villiger rearrangement, can be alleviated by selective deactivation of the stereoelectronic effects that promote the 1,2-alkyl shift. Stable cyclic Criegee intermediates constrained within a five-membered ring can be prepared by mild reduction of the respective hydroperoxy peroxyesters (β-hydroperoxy-β-peroxylactones) which were formed in high yields in reaction of β-ketoesters with BF3?Et2O/H2O2.
Five Roads That Converge at the Cyclic Peroxy-Criegee Intermediates: BF3-Catalyzed Synthesis of β-Hydroperoxy-β-peroxylactones
Vil, Vera A.,Gomes, Gabriel Dos Passos,Ekimova, Maria V.,Lyssenko, Konstantin A.,Syroeshkin, Mikhail A.,Nikishin, Gennady I.,Alabugin, Igor V.,Terent'Ev, Alexander O.
, p. 13427 - 13445 (2018/11/02)
We have discovered synthetic access to β-hydroperoxy-β-peroxylactones via BF3-catalyzed cyclizations of a variety of acyclic precursors, β-ketoesters and their silyl enol ethers, alkyl enol ethers, enol acetates, and cyclic acetals, with H2O2. Strikingly, independent of the choice of starting material, these reactions converge at the same β-hydroperoxy-β-peroxylactone products, i.e., the peroxy analogues of the previously elusive cyclic Criegee intermediate of the Baeyer-Villiger reaction. Computed thermodynamic parameters for the formation of the β-hydroperoxy-β-peroxylactones from silyl enol ethers, enol acetates, and cyclic acetals confirm that the β-peroxylactones indeed correspond to a deep energy minimum that connects a variety of the interconverting oxygen-rich species at this combined potential energy surface. The target β-hydroperoxy-β-peroxylactones were synthesized from β-ketoesters, and their silyl enol ethers, alkyl enol ethers, enol acetates, and cyclic acetals were obtained in 30-96% yields. These reactions proceed under mild conditions and open synthetic access to a broad selection of β-hydroperoxy-β-peroxylactones that are formed selectively even in those cases when alternative oxidation pathways can be expected. These β-peroxylactones are stable and can be useful for further synthetic transformations.
Novel heterocyclic scaffolds of GW4064 as farnesoid X receptor agonists
Smalley, Terrence L.,Boggs, Sharon,Caravella, Justin A.,Chen, Lihong,Creech, Katrina L.,Deaton, David N.,Kaldor, Istvan,Parks, Derek J.
, p. 280 - 284 (2015/02/19)
The farnesoid X receptor (FXR) may play a crucial role in a number of metabolic diseases and, as such, could potentially serve as a target for the development of therapeutics as a treatment for those diseases. Previous work has described GW4064 as an FXR
3-Oxoisoxazole-2(3H)-carboxamides and isoxazol-3-yl carbamates: Resistance-breaking acetylcholinesterase inhibitors targeting the malaria mosquito, Anopheles gambiae
Verma, Astha,Wong, Dawn M.,Islam, Rafique,Tong, Fan,Ghavami, Maryam,Mutunga, James M.,Slebodnick, Carla,Li, Jianyong,Viayna, Elisabet,Lam, Polo C.-H.,Totrov, Maxim M.,Bloomquist, Jeffrey R.,Carlier, Paul R.
, p. 1321 - 1340 (2015/03/04)
To identify potential selective and resistance-breaking mosquitocides against the African malaria vector Anopheles gambiae, we investigated the acetylcholinesterase (AChE) inhibitory and mosquitocidal properties of isoxazol-3-yl dimethylcarbamates (15), and the corresponding 3-oxoisoxazole-2(3H)-dimethylcarboxamide isomers (14). In both series, compounds were found with excellent contact toxicity to wild-type susceptible (G3) strain and multiply resistant (Akron) strain mosquitoes that carry the G119S resistance mutation of AChE. Compounds possessing good to excellent toxicity to Akron strain mosquitoes inhibit the G119S mutant of An. gambiae AChE (AgAChE) with ki values at least 10- to 600-fold higher than that of propoxur, a compound that does not kill Akron mosquitoes at the highest concentration tested. On average, inactivation of WT AgAChE by dimethylcarboxamides 14 was 10-20 fold faster than that of the corresponding isoxazol-3-yl dimethylcarbamates 15. X-ray crystallography of dimethylcarboxamide 14d provided insight into that reactivity, a finding that may explain the inhibitory power of structurally-related inhibitors of hormone-sensitive lipase. Finally, human/An. gambiae AChE inhibition selectivities of these compounds were low, suggesting the need for additional structural modification.
Creation through immobilization: A new family of high performance heterogeneous bifunctional iminophosphorane (BIMP) superbase organocatalysts
Goldys, Anna M.,Nez, Marta G.,Dixon, Darren J.
supporting information, p. 6294 - 6297 (2015/02/05)
An immobilized chiral bifunctional iminophosphorane superbase organocatalyst has been developed and applied in a range of challenging enantioselective reactions. A unique feature of this novel catalytic system is that the final step creation of the iminophosphorane occurs at the point of immobilization. The utility of the immobilized catalyst system was demonstrated in the nitro-Mannich reaction of ketimines as well as the conjugate addition of high pKa 1,3-dicarbonyl pro-nucleophiles to nitrostyrene. Catalyst recycling was also demonstrated.
Total synthesis of (-)-rhizopodin
Dalby, Stephen M.,Goodwin-Tindall, Jake,Paterson, Ian
supporting information, p. 6517 - 6521 (2013/07/27)
Core assembly: The total synthesis of the myxobacterial metabolite rhizopodin, a potent actin-binding anticancer agent, has been achieved. The modular synthesis utilizes a common C1-C22 monomeric unit to assemble the dimeric 38-membered macrodiolide core, which was elaborated by a bidirectional boron-mediated aldol reaction to install the characteristic side-chains. The final global deprotection was critically dependent on the correct choice of silyl protecting groups at C16/C16′. Copyright
Discovery of a 3-pyridylacetic acid derivative (TAK-100as a potent, selective and orally active dipeptidyl peptidase IV (DPP-4) inhibitor
Miyamoto, Yasufumi,Banno, Yoshihiro,Yamashita, Tohru,Fujimoto, Tatsuhiko,Oi, Satoru,Moritoh, Yusuke,Asakawa, Tomoko,Kataoka, Osamu,Yashiro, Hiroaki,Takeuchi, Koji,Suzuki, Nobuhiro,Ikedo, Koji,Kosaka, Takuo,Tsubotani, Shigetoshi,Tani, Akiyoshi,Sasaki, Masako,Funami, Miyuki,Amano, Michiko,Yamamoto, Yoshio,Aertgeerts, Kathleen,Yano, Jason,Maezaki, Hironobu
experimental part, p. 831 - 850 (2011/04/12)
Inhibition of dipeptidyl peptidase IV (DPP-4is an exciting new approach for the treatment of diabetes. To date there has been no DPP-4 chemotype possessing a carboxy group that has progressed into clinical trials. Originating from the discovery of the str
NON-NUCLEOSIDE REVERSE TRANSCRIPTASE INHIBITORS
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Page/Page column 58, (2008/12/05)
Compounds of Formula (I) are HIV reverse transcriptase inhibitors, wherein X, R1, R2, R3, R4 and R5 are defined herein. The compounds of Formula (I) and their pharmaceutically acceptable salts are useful in the inhibition of HIV reverse transcriptase, the prophylaxis and treatment of infection by HIV and in the prophylaxis, delay in the onset or progression, and treatment of AIDS. The compounds and their salts can be employed as ingredients in pharmaceutical compositions, optionally in combination with other antivirals, immunomodulators, antibiotics or vaccines.
Microwave-assisted solution-phase synthesis of 1,4,5-trisubstituted pyrazoles
Giacomelli, Giampaolo,Porcheddu, Andrea,Salaris, Margherita,Taddei, Maurizio
, p. 537 - 541 (2007/10/03)
A small parallel library of 1,4,5-trisubstituted pyrazoles was prepared in solution using a three-step procedure starting from Meldrum acid. The Meldrum acid was acylated with different acyl chlorides and the products opened with different alcohols and amines to give substituted β-keto esters and β-keto amines. Further reaction with N,N-dimethylformamide dimethylacetal and the final cyclisation were effectively carried out under microwave irradiation. Scavenger resins were employed exclusively in the first step, whereas use of microwaves allowed complete conversion of the starting materials in the other two steps. Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003.
