4-Benzylamino-1-chloro-6-substituted Phthalazines: Synthesis and Inhibitory Activity toward Phosphodiesterase 5
摘要:
We synthesized various 4-benzylamino-1-chloro-6-substituted phthalazines (15) and 4-benzylamino-1-chloro-7-substituted phthalazines (16) and evaluated their inhibitory activity toward phosphodiesterase 5 (PDE5) purified from porcine platelets. The PDE5-inhibitory activities of 15 were greater than those of the isomers (16). The preferred substituent at the 4-position of phthalazine was a (3-chloro-4-methoxybenzyl)amino group, and those at the B-position were cyano, nitro, and trifluoromethyl groups. Compounds 15a (IC50 = 4.8 nM), 15f (3.5 nM), and 15i (5.3 nM) were more potent inhibitors than E4021 (8.6 nM). Compounds 15a and 15f also showed vasorelaxant activity in isolated porcine coronary arteries precontracted with prostaglandin F-2 alpha (10(-5) M). The EC50 values for vasorelaxant action of 15a, 15f, and E4021 were 150, 160, and 980 nM, respectively. These results show that novel PDE5 inhibitors possessing a potent vasorelaxant effect may exist among phthalazine derivatives.
Inhibitors of dipeptidyl peptidase 8 and dipeptidyl peptidase 9. Part 2: Isoindoline containing inhibitors
作者:Sebastiaan Van Goethem、Pieter Van der Veken、Véronique Dubois、Anna Soroka、Anne-Marie Lambeir、Xin Chen、Achiel Haemers、Simon Scharpé、Ingrid De Meester、Koen Augustyns
DOI:10.1016/j.bmcl.2008.05.079
日期:2008.7
selective and potent inhibitors of dipeptidylpeptidases 8 and 9, we synthesized a series of substituted isoindolines as modified analogs of allo-Ile-isoindoline, the reference DPP8/9inhibitor. The influence of phenyl substituents and different P2 residues on the inhibitors' affinity toward other DPPs and more specifically, their potential to discriminate between DPP8 and DPP9 will be discussed. Within
Rhodium(CAAC)‐Catalyzed Arene Hydrogenation of Benzo‐Fused
<i>N</i>
‐Heterocycles to Saturated Building Blocks with an all‐
<i>cis</i>
Configuration
作者:Christian H. Schiwek、Simone Stegbauer、Thomas Pickl、Thorsten Bach
DOI:10.1002/adsc.202200582
日期:2022.10.4
and heterocyclic building blocks can be readily obtained by the hydrogenation of aromatic carbo- and heterocycles. Although a variety of methods have been established to accomplish this transformation for simple arenes, the hydrogenation of aromatic N-heterocycles is less explored. We herein report a diastereoselective arenehydrogenation which was applied to an array of benzo-fused N-heterocycles. A