New Pyrazine Conjugates: Synthesis, Computational Studies, and Antiviral Properties against SARS‐CoV‐2
作者:Israa A. Seliem、Adel S. Girgis、Yassmin Moatasim、Ahmed Kandeil、Ahmed Mostafa、Mohamed A. Ali、Mohamed S. Bekheit、Siva S. Panda
DOI:10.1002/cmdc.202100476
日期:2021.11.19
Antiviral drug development for SARS-CoV-2: The design and microwave-assisted synthesis of pyrazine conjugates are reported. Some of the newly synthesized conjugates show better antiviral activity and selectivity indexes than those of the reference drug. All the lead compounds exhibited low cytotoxicity. Thus, these conjugates could lead to the development of potential drug candidates for SARS-CoV-2.
decarbonylative C−H coupling of azoles and aromaticesters by palladium catalysis is described. Our previously reported Ni‐catalyzed C−H coupling of azoles and aromaticesters has a significant drawback regarding the substrate scope. Herein, we employ palladium catalysis instead of nickel, resulting in a broader substrate scope in terms of azoles and aromaticesters.
Design and development of POCN-pincer palladium catalysts for C–H bond arylation of azoles with aryl iodides
作者:Shrikant M. Khake、Vineeta Soni、Rajesh G. Gonnade、Benudhar Punji
DOI:10.1039/c4dt01547a
日期:——
complex 2a efficiently catalyzes the C–Hbondarylation of benzothiazole, substituted-benzoxazoles and 5-aryl oxazoles with diverse aryl iodides in the presence of CuI as a co-catalyst under mild reaction conditions. This represents the first example of a pincer palladium complex being applied for the direct C–Hbondarylation of any heterocycle with low catalyst loading. A preliminary mechanistic investigation
已经开发出定义明确且有效的POCN连接的钯络合物,用于将唑类与芳基碘化物直接进行C–H键芳基化。的膦酸酯-胺配体钳形1-(R 2 PO)-C 6 H ^ 4 -3-(CH 2 Ñ我镨2)[ R 2 POCN IPR2 -H; R = i Pr(1a),R = t Bu(1b)]和相应的钯配合物2-(R 2 PO)-C 6 H 3 -6-(CH 2 N i Pr 2)} PdCl [(R2 POCN iPr2氯化钯; R = i Pr(2a),R = t Bu(2b)]以高收率合成。用KI和AgOAc处理钯配合物2a分别得到配合物(iPr2 POCN iPr2)PdI(3a)和(iPr2 POCN iPr2)Pd(OAc)(4a)。类似地,2a与苯并噻唑基-锂的反应以定量收率产生了(iPr2 POCN iPr2)Pd(苯并噻唑基)(5a)络合物。夹钯复合物2a在CuI作为助催化剂的条件下,
Development of (quinolinyl)amido-based pincer palladium complexes: a robust and phosphine-free catalyst system for C–H arylation of benzothiazoles
作者:Hanumanprasad Pandiri、Vineeta Soni、Rajesh G. Gonnade、Benudhar Punji
DOI:10.1039/c7nj00452d
日期:——
(Quinolinyl)amido-ligated palladium(II) complexes have been synthesized and applied in the catalytic C–H bond arylation of benzothiazoles. The tridentate ligand precursors R2N-C(O)CH2-(NH)-C9H6N [(R2NNN8-Q)–H; R2N = morpholinyl, Me-N-piperazinyl] and the pincerpalladiumcomplexes [κN,κN,κN-R2N-C(O)CH2-(μ-N)-C9H6N}]PdX [(R2NNN8-Q)PdX R2N = Et2N, morpholinyl, Me-N-piperazinyl; X = OAc or Cl}] were
Pyrazine Heterocycles from 2,3-Pyrazinedicarboxylic Anhydride
作者:M. A. Hassan、S. E. Zayed、W. N. El-Gaziri、Saoud A. Metwally
DOI:10.1002/ardp.19913240311
日期:——
Pyrazine derivatives show a wide range of biological activities. Some derivatives are used for tuberculosis treatment1). Pyrazinosulfonamides are long acting sulfonamides2) and in combination with certain pyrimidine derivatives have shown dramatic effects in clinical trials against resistant falciparum malaria3). A group of diuretics has been found among substituted amidinocarbamoyl‐aminopyrazines4)