Creation of thio and selenocyanate derivatives of 4-quinolone <i>via</i> regioselective C–H bond functionalization under ambient conditions
作者:Prasanjit Ghosh、Gautam Chhetri、Aritra Kumar Nandi、Sagar Sarkar、Tilak Saha、Sajal Das
DOI:10.1039/c9nj01922g
日期:——
An operationally simple C–SCN and C–SeCN bond formation technique to generate different SCN/SeCN substituted 4-quinolone derivatives using NH4SCN/KSeCN in excellent yields was developed.
Herein, a novel and efficient intermolecular cyclization of 2-aminoacetophenones with aldehydes was developed for the synthesis of 2-aryl-4-quinolones through C–C and C–N bond formation. Mild conditions, good functional group tolerance, and substrates without prefunctionalization make this protocol practical, and this strategy will stimulate keen interest in fields of chemistry and biology.
Ruthenium(II) Catalyzed Regiospecific C–H/O–H Annulations of Directing Arenes via Weak Coordination
作者:Arghya Banerjee、Sourav Kumar Santra、Prakash Ranjan Mohanta、Bhisma K. Patel
DOI:10.1021/acs.orglett.5b02967
日期:2015.11.20
Ruthenium(II) catalyzed oxidative CH/OH annulations have been demonstrated using two different directing arenes viz. 2-arylquinolinone and 2-arylbenzoxazinone with internal alkynes. Regiospecific annulations have been observed for both directing arenes via the assistance of weaker carbonyl oxygen in the presence of a stronger nitrogen-directing site. In this substrate-controlled convergent protocol the weaker directing group dictates the annulation path.
Evaluation of synthetic acridones and 4-quinolinones as potent inhibitors of cathepsins L and V
作者:Emerson F. Marques、Mauro A. Bueno、Patrícia D. Duarte、Larissa R.S.P. Silva、Ariani M. Martinelli、Caio Y. dos Santos、Richele P. Severino、Dieter Brömme、Paulo C. Vieira、Arlene G. Corrêa
DOI:10.1016/j.ejmech.2012.04.002
日期:2012.8
Cathepsins, also known as lysosomal cysteine peptidases, are members of the papain-like peptidase family, involved in different physiological processes. In addition, cathepsins are implicated in many pathological conditions. This report describes the synthesis and evaluation of a series of N-arylanthranilic acids, acridones, and 4-quinolinones as inhibitors of cathepsins V and L The kinetics revealed that compounds of the classes of acridones are reversible competitive inhibitors of the target enzyme with affinities in the low micromolar range. They represent promising lead candidates for the discovery of novel competitive cathepsin inhibitors with enhanced selectivity and potency. On the other hand, 4-quinolinones were noncompetitive inhibitors and N-arylanthranilic acids were uncompetitive inhibitors. (C) 2012 Elsevier Masson SAS. All rights reserved.
Access to 2-Alkyl/Aryl-4-(1<i>H</i>)-Quinolones via Orthogonal “NH<sub>3</sub>” Insertion into <i>o</i>-Haloaryl Ynones: Total Synthesis of Bioactive Pseudanes, Graveoline, Graveolinine, and Waltherione F
An efficient one-pot synthesis of 4-(1H)-quinolones through an orthogonal engagement of diverse o-haloaryl ynones with ammonia in the presence of Cu(I), involving tandem Michael addition and ArCsp2-N coupling, is presented. The substrate scope of this convenient protocol, wherein ammonium carbonate acts as both an in situ ammonia source and a base toward diverse 2-substituted 4-(1H)-quinolones, has