Asymmetric synthesis of 3-substituted indole derivatives containing tetrahydrothiophene via cascade sulfa-Michael/Michael additions catalyzed by a chiral squaramide catalyst
摘要:
The organocatalyzed enantioselective cascade sulfa-Michael/Michael addition reaction of (E)-3-mercapto-2-butenoic acid esters to (E)-3-aryl-2-(indol-3-ylcarbonyl)acrylonitriles has been developed. This process was promoted by a chiral squaramide catalyst to afford chiral 3-substituted indole derivatives containing tetrahydrothiophene with three contiguous stereocenters in excellent diastereoselectivities (up to >20:1 dr) with moderate to good yields and enantioselectivities (up to 93%, 89% ee). (C) 2014 Elsevier Ltd. All rights reserved.
Focused library development of 2-phenylacrylamides as broad spectrum cytotoxic agents
摘要:
With our lead compound (E)-3-(4-chlorophenyl)-2-(1H-pyrrole-2-carbonyl)acrylonitrile (1) inducing 50% growth inhibition of 11 cancer cell lines at 27-61 mu M, potency enhancements were rapidly established through the synthesis of a series of focused compound libraries. Six highly focused libraries (46 compounds in total) were synthesised. Each library allowed the identification of a new lead compound, viz Library A identified (E)-3-(pentafluorophenyl)-2-(1H-pyrrole-2-carbonyl) acrylonitrile (11) and (E)-3-(1H-indol-3-yl)-2-(1H-pyrrole-2-carbonyl) acrylonitrile (13) as inhibitors with improved cytotoxicity. Synthesis of discrete libraries of amidoacrylamide analogues (Ar-C=C(CN)-A(sic)Ar-C=C(CN)-C(=O)NH)-Ar) resulted in a series of analogues significantly more potent that the lead, 1. Three furan three analogues: (E)-3-(5-chlorofuran-2-yl)-2-cyano-N-(4-methoxybenzyl)acrylamide (33), (E)-3-(5-bromofuran-2-yl)-2-cyano-N-(4-methoxybenzyl) acrylamide (34) and (E)-2-cyano-3-(furan-3-yl)-N-(4-methoxybenzyl)acrylamide (37) returned broad spectrum growth inhibition (GI(50) values of 5-16 mu M). Replacement of the furan moiety with simple aromatics gave an additional three analogues: (E)-2-cyano-N-(4-methoxybenzyl)-3-phenylacrylamide (39), (E)-3-(4-chlorophenyl)-2-cyano-N-(4-methoxybenzyl) acrylamide (41) and (E)-2-cyano-N-(4-methoxyphenyl)-3-(naphthalen-1-yl)acrylamide (45) with GI(50) values of 7-24 mu M. The final library retained the aromatic substituents but introduced a 3,4-dichlorbenzylamine moiety to afford the 1-naphthyl substituted 52, which was the most potent broad spectrum cytotoxic analogue produced here in with an average GI(50) = 8.6 mu M. This represents a fivefold potency enhancement relative to 1 and a new cytotoxic scaffold suitable for further development. (C) 2012 Published by Elsevier Ltd.
Novel cyanochalcones as potential anticancer agents: apoptosis, cell cycle arrest, DNA binding, and molecular docking studies
作者:Mohamed A. Ragheb、Hanan E. Abdelrashid、Emad M. Elzayat、Ismail A. Abdelhamid、Marwa H. Soliman
DOI:10.1080/07391102.2024.2316764
日期:——
In the light of anticancer drug discovery and development, a new series of cyanochalcones incorporating indole moiety (5a-g) were efficiently synthesized and characterized by different spectral ana...