3-Substituted Isocoumarins as Thymidine Phosphorylase Inhibitors
作者:Khalid Mohammed Khan、Sumbul Ahmed、Sajjad Hussain、Nida Ambreen/snm、>、Shahnaz Perveen、M. Iqbal Choudhary
DOI:10.2174/157018010790945805
日期:2010.5.1
3-Substituted isocoumarins 1-19 were synthesized and evaluated for their thymidine phosphorylase inhibitory activity. Eight (8) compounds exhibited a varying degree of inhibitory activity towards thymidine phosphorylase from E. coli with IC50 values between 61- 402 iM. The activities were compared with the standard 7-deazaxanthine (IC50 = 39.28 ± 0.76 iM).
Sulfoxonium Ylides as Carbene Precursors: Rhodium(III)‐Catalyzed Sequential C−H Functionalization, Selective Enol Oxygen‐Atom Nucleophilic Addition, and Hydrolysis
作者:Yuanqiong Huang、Xueli Lyu、Hongjian Song、Qingmin Wang
DOI:10.1002/adsc.201900861
日期:2019.11.19
Herein, we report a protocol for Rh(III)‐catalyzed annulation reactions between oxazolines and sulfoxonium ylides via a sequence involving C−H activation, selective enol oxygen‐atom nucleophilic addition, and hydrolysis. This practical, operationally simple protocol has a wide substrate range, excellent regioselectivity, and moderate to good yields.
Cu-catalyzed coupling-cyclization in PEG 400 under ultrasound: a highly selective and greener approach towards isocoumarins
作者:R. Gangadhara Chary、G. Rajeshwar Reddy、Y. S. S. Ganesh、K. Vara Prasad、S. K. Phani Chandra、Soumita Mukherjee、Manojit Pal
DOI:10.1039/c3ra40969d
日期:——
The combination of CuI–K2CO3-PEG 400 facilitated the coupling-cyclization of o-iodobenzoic acid with terminal alkynes under ultrasound, affording a greener and practical approach towards 3-substituted isocoumarins with remarkable regioselectivity. This inexpensive and Pd and ligand free methodology gave rise to various isocoumarins of potential pharmacological interest.
Ru(<scp>ii</scp>)-Catalyzed C–H bond activation/annulation of <i>N</i>-iminopyridinium ylides with sulfoxonium ylides
作者:Xiang Li、Danlu Li、Xiaofei Zhang
DOI:10.1039/d1ob02427b
日期:——
A Ru(II)-catalyzed C–H bond activation/annulation of N-iminopyridinium ylides with sulfoxoniumylides has been developed for the synthesis of diverse functionalized isocoumarin derivatives. This method features broad substrate scope, high functional group tolerance, simple operation and silver salt-free conditions. Furthermore, the synthetic utility of this method is demonstrated by the alkenylation
已经开发了一种 Ru( II ) 催化的N-亚氨基吡啶叶立德与锍叶立德的 C-H 键活化/环化,用于合成各种官能化的异香豆素衍生物。该方法具有底物范围广、官能团耐受性高、操作简单、无银盐条件等特点。此外,该方法的合成效用通过产物的烯基化和生物活性 thunberginol A 的有效合成得到证明。
Ag<sub>2</sub>O nanoparticle-catalyzed substrate-controlled regioselectivities: direct access to 3-ylidenephthalides and isocoumarins
作者:Sandeep Chaudhary、Bharti Rajesh K. Shyamlal、Lalit Yadav、Mohit K. Tiwari、Krishan Kumar
DOI:10.1039/c8ra03926g
日期:——
nanoparticle-catalyzed, direct regioselective synthesis of 3-ylidenephthalides 11–16 and isocoumarins 17–20 via sonogashira type coupling followed by substrate-controlled 5-exo-dig or 6-endo-dig cyclization reaction, respectively. This one pot coupling involves reaction of substituted 2-halobenzoic acid with meta/para-substituted and ortho-substituted terminal alkynes, which proceeded in a regioselective manner resulting