A simple and efficient palladium-catalyzed intramolecular carbonylativesynthesis of isocoumarins and phthalides from the easily available starting materials by employing phenylformate as a CO surrogate has been achieved. The approach affords target compounds in good to excellent yields with the advantages of lower toxicity, milder conditions, easy operation and wide functional group tolerance.
The selective synthesis of (Z)‐ or (E)‐3‐aryl/vinyl/alkylidene‐isoindolones, and 2‐benzopyran derivatives from o‐(1‐alkynyl)benzamides by means of a suitable choice of bases or silver catalysis is described.
for the preparation of 3-substituted isocoumarins via palladium-catalyzed nucleophilic addition/oxidative annulation of bromoalkynes with benzoic acids has been developed. Remarkably, preliminary mechanistic studies indicated that the transformation might proceed via a stereo- and regioselective nucleophilic addition and C–H functionalization procedure.
The Rh(III)-catalyzed C–H activation initiated cyclization of benzoicacids with electron-rich geminal-substituted vinyl acetates was described. The reaction was employed to prepare a range of 3-aryl and 3-alkyl substituted isocoumarins selectively.
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).