Iridium-Catalyzed Enantioselective and Diastereoselective Allylation of Dioxindoles: A One-Step Synthesis of 3-Allyl-3-hydroxyoxindoles
摘要:
An iridium-catalyzed asymmetric allylation of dioxindoles, 3-hydroxyoxindoles, regulated by prosthetic groups has been accomplished under mild conditions. The methodology is applicable to a diverse array of 3-hydroxyoxindole and cinnamyl acetate substrates. A range of 3-ally'-3-hydroxyoxindoles containing vicinal tetrasubstituted and trisubstituted stereocenters can be efficiently synthesized in one-step with excellent enantioselectivity (up to >99% enaniomeric excess (ee)) and good diastereoselectivity (up to 11:1 diastereomeric ratio (dr)).
coumarin-isatin derivatives. Furthermore, enzyme kinetic studies showed that compound 5p is a non-competitive inhibitor with a Ki of 2.14 mum. Molecular docking analysis revealed the existence of hydrophobic and hydrogen interactions between compound 5p and the active site of alpha-glucosidase. Our results indicate that coumarin-isatin derivatives as a new class of alpha-glucosidase inhibitors.
designed and synthesized. All newly synthesized compounds were evaluated for their a-glucosidase inhibitory activity with resveratrol as positive control in vitro. Except for 3i and 3j, all of the compounds showed a potent inhibitory activity against a-glucosidase with IC50 values in the range of 3.12 ± 1.25 to 45.95 ± 1.26 μM and the purity of these compounds was greater than 95%. The IC50 values were
Synthesis and antibacterial activity of Schiff bases of 5-substituted isatins
作者:Kamaleddin Haj Mohammad Ebrahim Tehrani、Maryam Hashemi、Maryam Hassan、Farzad Kobarfard、Shohreh Mohebbi
DOI:10.1016/j.cclet.2015.10.027
日期:2016.2
Abstract Based on the existing reports on the bioactive isatin derivatives, a number of Schiff bases were synthesized by reacting 5-substituted isatins with bioactive amines/hydrazides and their structures were confirmed using spectroscopic methods such as NMR, IR and massspectrometry. Furthermore, N -benzylation of isatin followed by the Schiff base formation furnished a new series of compounds (
Enantioselective Construction of Tetrahydroquinolin-5-one-Based Spirooxindole Scaffold via an Organocatalytic Asymmetric Multicomponent [3 + 3] Cyclization
作者:Qiu-Ning Zhu、Yu-Chen Zhang、Meng-Meng Xu、Xiao-Xue Sun、Xue Yang、Feng Shi
DOI:10.1021/acs.joc.6b01598
日期:2016.9.2
e-based spirooxindole has been developed via a chiral cinchona alkaloid catalyzed asymmetric three-component [3 + 3] cyclization of cyclic enaminone, isatin, and malononitrile, which afforded a series of tetrahydroquinolin-5-one-based spirooxindoles in high yields and with excellent enantioselectivities (up to 99% yield, 97:3 er). This reaction could be applicable to large-scale synthesis of enantioenriched
Synthesis, in vitro α-glucosidase inhibitory activity and docking studies of novel chromone-isatin derivatives
作者:Guangcheng Wang、Ming Chen、Jie Qiu、Zhenzhen Xie、Anbai Cao
DOI:10.1016/j.bmcl.2017.11.047
日期:2018.1
designed, synthesized and characterized by 1H NMR, 13C NMR and HRMS. These novel synthetic compounds were evaluated for inhibitoryactivity against yeast α-glucosidase enzyme. The results of biological test have shown that all tested compounds exhibited excellent to potent inhibitoryactivity in the range of IC50 = 3.18 ± 0.12–16.59 ± 0.17 μM as compared to the standard drug acarbose (IC50 = 817.38 ± 6.27 μM)
通过1 H NMR,13 C NMR和HRMS设计,合成和表征了一系列色酮-靛红衍生物6a - 6p。评价了这些新颖的合成化合物对酵母α-葡萄糖苷酶的抑制活性。生物学测试结果表明, 与标准药物阿卡波糖(IC 50 = 817.38±6.27μM)相比,所有测试化合物在IC 50 = 3.18±0.12–16.59±0.17μM范围内均表现出优异至有效的抑制活性。化合物6j(IC 50 (= 3.18±0.12μM),在色酮的7位具有羟基,在isatin的N1位具有4-溴苄基,是该系列中活性最高的化合物。此外,进行了分子对接研究以帮助理解最活跃的类似物与α-葡萄糖苷酶的结合相互作用。这些结果表明这类化合物具有开发抗糖尿病药的潜力。