partially supported by the Natural Science Foundation of Jiangsu Province (BK2011422);the Natural Science Key Basic Research of Jiangsu Province for Higher Education (05KJD150251);the Key Laboratory of Organic Synthesis of Jiangsu Province (KJS1112);the Jiangsu Provincial Key Laboratory of Coastal Wetland Bioresources and Environmental Protection (JLCBE06008)
Reactions of isatins with 5-aminopyrazole afforded the 3-(5-aminopyrazol-4-yl)-3-hydroxy-2-oxindolines in good to excellent yields in refluxing water. No catalysts were required in the process. The new method exhibite...