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4468-48-8Relevant articles and documents
Asymmetric Transfer Hydrogenation of α-Substituted-β-Keto Carbonitriles via Dynamic Kinetic Resolution
Wang, Fangyuan,Yang, Tilong,Wu, Ting,Zheng, Long-Sheng,Yin, Congcong,Shi, Yongjie,Ye, Xiang-Yu,Chen, Gen-Qiang,Zhang, Xumu
supporting information, p. 2477 - 2483 (2021/02/16)
A catalytic protocol for the enantio- and diastereoselective reduction of α-substituted-β-keto carbonitriles is described. The reaction involves a DKR-ATH process with the simultaneous construction of β-hydroxy carbonitrile scaffolds with two contiguous stereogenic centers. A wide range of α-substituted-β-keto carbonitriles were obtained in high yields (94%-98%) and excellent enantio- and diastereoselectivities (up to >99% ee, up to >99:1 dr). The origin of the diastereoselectivity was also rationalized by DFT calculations. Furthermore, this methodology offers rapid access to the pharmaceutical intermediates of Ipenoxazone and Tapentadol.
COMPOSITIONS AND METHODS FOR SUBSTITUTED 7-(PIPERAZIN-1-YL)PYRAZOLO[1,5-A]PYRIMIDINE ANALOGS AS INHIBITORS OF KRAS
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Paragraph 0256, (2021/06/22)
In one aspect, the disclosure relates to compounds useful as inhibitors of mutant KRAS proteins, methods of making the same, pharmaceutical compositions comprising the same, and methods of treating cancers associated with mutated forms of KRAS using the same. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present disclosure.
Stereoselective C?C Oxidative Coupling Reactions Photocatalyzed by Zwitterionic Ligand Capped CsPbBr3 Perovskite Quantum Dots
Cai, Tong,Candler, Yolanda,Chen, Ou,He, Jie,Hills-Kimball, Katie,Shi, Wenwu,Wang, Ping,Wei, Zichao,Yang, Hanjun,Yuan, Yucheng,Zhu, Hua
supporting information, p. 22563 - 22569 (2020/10/12)
Semiconductor quantum dots (QDs) have attracted tremendous attention in the field of photocatalysis, owing to their superior optoelectronic properties for photocatalytic reactions, including high absorption coefficients and long photogenerated carrier lifetimes. Herein, by choosing 2-(3,4-dimethoxyphenyl)-3-oxobutanenitrile as a model substrate, we demonstrate that the stereoselective (>99 %) C?C oxidative coupling reaction can be realized with a high product yield (99 %) using zwitterionic ligand capped CsPbBr3 perovskite QDs under visible light illumination. The reaction can be generalized to different starting materials with various substituents on the phenyl ring and varied functional moieties, producing stereoselective dl-isomers. A radical mediated reaction pathway has been proposed. Our study provides a new way of stereoselective C?C oxidative coupling via a photocatalytic means using specially designed perovskite QDs.
Copper-catalysed: N -arylation of 5-aminopyrazoles: A simple route to pyrazolo[3,4- b] indoles
Chatterjee, Arpita,Murmu, Chudamani,Peruncheralathan, S.
supporting information, p. 6571 - 6581 (2020/11/07)
A copper-catalysed intramolecular N-arylation of 5-aminopyrazoles is demonstrated for the first time. Highly substituted pyrazolo[3,4-b]indoles are synthesized. In particular, the indole core is decorated with halogens and alkyl and methoxy groups. Furthermore, a selective N-arylation of unsymmetrical diaryl bromide containing pyrazoles is exemplified, resulting in valuable pyrazolo[1,5-a]benzimidazoles. This journal is
APELIN RECEPTOR AGONISTS AND METHODS OF USE THEREOF
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Paragraph 0183-0184, (2019/02/25)
Provided herein are agonists of the apelin receptor for the treatment of disease. The compounds disclosed herein are useful for the treatment of a range of cardiovascular, renal and metabolic conditions.
Synthesis and biological evaluation of 7-(aminoalkyl)pyrazolo[1,5-a]pyrimidine derivatives as cathepsin K inhibitors
Petek, Nejc,?tefane, Bogdan,Novinec, Marko,Svete, Jurij
, p. 226 - 238 (2018/12/04)
A series of novel 7-aminoalkyl substituted pyrazolo[1,5-a]pyrimidine derivatives were synthesized and tested for inhibition of cathepsin K. The synthetic methodology comprises cyclization of 5-aminopyrazoles with N-Boc-α-amino acid-derived ynones followed by transformation of the ester and the Boc-amino functions. It allows for easy diversification of the pyrazolo[1,5-a]pyrimidine scaffold at various positions. Molecular docking studies with pyrazolo[1,5-a]pyrimidine derivatives were also performed to elucidate the binding mode in the active site of cathepsin K. The synthesized compounds exhibited moderate inhibition activity (Ki ≥ 77 μM).
N -Acetyl-3-aminopyrazoles block the non-canonical NF-kB cascade by selectively inhibiting NIK
Pippione, Agnese C.,Sainas, Stefano,Federico, Antonella,Lupino, Elisa,Piccinini, Marco,Kubbutat, Michael,Contreras, Jean-Marie,Morice, Christophe,Barge, Alessandro,Ducime, Alex,Boschi, Donatella,Al-Karadaghi, Salam,Lolli, Marco L.
supporting information, p. 963 - 968 (2018/06/27)
NF-κB-inducing kinase (NIK), an oncogenic drug target that is associated with various cancers, is a central signalling component of the non-canonical pathway. A blind screening process, which established that amino pyrazole related scaffolds have an effect on IKKbeta, led to a hit-to-lead optimization process that identified the aminopyrazole 3a as a low μM selective NIK inhibitor. Compound 3a effectively inhibited the NIK-dependent activation of the NF-κB pathway in tumour cells, confirming its selective inhibitory profile.
BF3·OEt2-mediated [1,2]-aryl shift: Synthesis of functionalized α-arylnitriles via the bromination/cyanation/deformylation of substituted deoxybenzoin
Chan, Chieh-Kai,Chang, Meng-Yang
, p. 5207 - 5213 (2017/07/28)
A new sequential, tandem synthesis of functionalized α-arylnitriles via the bromination/cyanation/deformylation of substituted deoxybenzoin has developed. CuBr2-promoted bromination of substituted deoxybenzoins gives 2-bromo-2-arylacetophenne 3. The cyanation of 3 with sodium cyanide (NaCN) generates epoxynitrile. Then, a treatment of epoxynitrile with BF3·OEt2 results in the formation of functionalized α-arylnitriles 4 via a 1,2-aryl shift.
Synthesis and cytotoxic evaluation of some new 1-(6- chloropyridazin-3-Yl)-3-H/Alkyl-4-phenyl-1H-pyrazol- 5-amines and their derivatives
Mamta,Aggarwal, Ranjana,Smith, Jessie,Sadana, Rachna
, p. 59 - 68 (2019/01/18)
Synthesis of new 1-(6-chloropyridazin-3-yl)-3-H/alkyl-4-phenyl-1H-pyrazol-5-amines (3) was accomplished by the reaction of 3-chloro-6-hydrazinopyridazine (1) with differently substituted β-ketonitriles (2) under reflux in ethanol. Subsequently, a series of 6-amino derivatives (4, 5 and 6) was synthesized by amino-de-halogenation of 3 with secondry cyclic amines e.g. pyrrolidine, piperidine and morpholine respectively. Structures of all the compounds were established by IR, NMR (1H, 13C and 19F) and mass spectral data, and elemental analysis. All the compounds were screened for their cytotoxic effects against three cancer cell lines (SB-ALL, NALM-6, MCF-7) using colorimetric MTT assay.
Synthesis of β-ketonitriles, α,β-alkynones and biscabinols from esters using tert-butoxide-assisted C(=O)-C (i.e., acyl-C) coupling under ambient conditions
Kim, Bo Ram,Lee, Hyung-Geun,Kang, Seung-Beom,Jung, Kwang-Ju,Sung, Gi Hyeon,Kim, Jeum-Jong,Lee, Sang-Gyeong,Yoon, Yong-Jin
, p. 10331 - 10336 (2013/11/19)
We demonstrated the synthesis of β-ketonitriles, α,β- alkynones, and biscarbinols using tert-butoxide-assisted C(CO)-C (i.e., acyl-C) coupling of esters under ambient conditions. tert-Butoxide-assisted C(CO)-C (i.e., acyl-C) coupling of esters with cyanomethylenes and acetylenes under transition metal-free ambient conditions gives β-ketonitriles, α,β-alkynones and/or aryl bis(phenylethynyl)carbinols in moderate-to-good yields. It is noteworthy that this is a rapid, facile, and efficient process under ambient conditions, and use of cheap and stable starting materials.