Recyclable Copper Nanoparticles‐Catalyzed Hydroboration of Alkenes and β‐Borylation of α,β‐Unsaturated Carbonyl Compounds with Bis(Pinacolato)Diboron
作者:Mahadev L. Shegavi、Suresh Saini、Ramesh Bhawar、Meghana Desai Vishwantha、Shubhankar Kumar Bose
DOI:10.1002/adsc.202001616
日期:2021.4.27
Nano‐ferrite‐supported Cu nanoparticles (Fe‐dopamine‐Cu NPs) catalyzed anti‐Markovnikov‐selective hydroboration of alkenes with B2pin2 is reported undermild reaction conditions. This protocol can be applied to a broad range of substrates with high functional group compatibility. In addition, we demonstrated the use of Fe‐dopamine‐Cu NPs as a catalyst for the β‐borylation of α,β‐unsaturatedketones and ester, providing
From Celecoxib to a Novel Class of Phosphodiesterase 5 Inhibitors: Trisubstituted Pyrazolines as Novel Phosphodiesterase 5 Inhibitors with Extremely High Potency and Phosphodiesterase Isozyme Selectivity
作者:Mohammad Abdel-Halim、Sara Sigler、Nora A. S. Racheed、Amr Hefnawy、Reem K. Fathalla、Mennatallah A. Hammam、Ahmed Maher、Yulia Maxuitenko、Adam B. Keeton、Rolf W. Hartmann、Matthias Engel、Gary A. Piazza、Ashraf H. Abadi
DOI:10.1021/acs.jmedchem.0c01120
日期:2021.4.22
trisubstituted pyrazoline scaffold derived from the COX2 inhibitor, celecoxib, was used to develop novel PDE5 inhibitors. Novel pyrazolines were identified with potent PDE5 inhibitory activity lacking COX2 inhibitory activity. Compound d12 was the most potent with an IC50 of 1 nM, which was three times more potent than sildenafil and more selective with a selectivity index of >10,000-fold against all other PDE
Biocatalytic green alternative to existing hazardous reaction media: synthesis of chalcone and flavone derivatives <i>via</i> the Claisen–Schmidt reaction at room temperature
作者:Kashyap J. Tamuli、Ranjan K. Sahoo、Manobjyoti Bordoloi
DOI:10.1039/d0nj03839c
日期:——
Hook. F. peel ash (MCPA) are used as catalysts to promote an inexpensive, efficient and eco-friendly carbon–carbon bond forming crossed aldol reaction at room temperature in solvent free conditions. Furthermore, the resulting products were subjected to reactions with these promoters in an oxygen atmosphere and led to the formation of novel flavone derivatives. Moreover, the used catalysts were properly
Solution phase synthesis of a spiro[pyrrolidine-2,3′-oxindole] library via a three component 1,3-dipolar cycloaddition reaction
作者:Demosthenes Fokas、William J. Ryan、David S. Casebier、David L. Coffen
DOI:10.1016/s0040-4039(98)00234-2
日期:1998.4
A combinatorial library of 26,500 spiro[pyrrolidine-2,3′-oxindoles] was prepared in a single-compound format by a facile intermolecular 1,3-dipolarcycloaddition. An azomethine ylide, generated by the decarboxylative condensation of an isatin 1 with an α-amino acid 2, was trapped by a trans-chalcone3 to afford heterocycles of the general structure 4. The regio- and stereochemistry of a representative
A Novel Approach to 1,2-Dihydro-2-Oxo-3-Pyridinecarboxylic Ester via Aromatization Induced by Deamidation
作者:Yuefei Hu、Gang Yu、Shaozhong Wang、Kai Wang、Hongwen Hu
DOI:10.1055/s-2004-822325
日期:——
A novel approach was developed for the preparation of 4,6-disubstituted-1,2-dihydro-2-oxo-3-pyridinecarboxylic ester in moderate to good yields. This route involves a reaction sequence of Michael addition, transformation to ene-lactam, and aromatization, featuring easily available material, variable substituents, and good functional compatibility.