3-SUBSTITUTED-3-HYDROXY OXINDOLE DERIVATIVES AND PROCESS FOR PREPARATION THEREOF
申请人:COUNCIL OF SCIENTIFIC & INDUSTRIAL RESEARCH
公开号:US20130345438A1
公开(公告)日:2013-12-26
The present invention relates to expedient method for synthesis of 3-substituted-3-hydroxy-oxindole derivatives, which are useful as synthetic precursors to valuable pharmaceutical compounds. These are synthesized by reacting nitromethane with the corresponding isatins of formula (I). The reaction process of isatins was carried using water as a solvent at room temperature to form the corresponding 3-hydroxy-3-nitromethylindolin-2-ones of formula (II).
for the synthesis of 3-hydroxy-3-(nitromethyl)indolin-2-one by the reaction of isatins with nitromethane/nitroethane in the presence of DABCO. The reaction is catalytic, very rapid, yields are very high and avoids the use of solvents for reaction. The protocol is applicable for substituted isatins as well as substituted nitroalkanes.
3-substituted-3-hydroxy oxindole derivatives and process for preparation thereof
申请人:Council of Scientific & Industrial Research
公开号:US08933248B2
公开(公告)日:2015-01-13
The present invention relates to expedient method for synthesis of 3-substituted-3-hydroxy-oxindole derivatives, which are useful as synthetic precursors to valuable pharmaceutical compounds. These are synthesized by reacting nitromethane with the corresponding isatins of formula (I). The reaction process of isatins was carried using water as a solvent at room temperature to form the corresponding 3-hydroxy-3-nitromethylindolin-2-ones of formula (II).