Process for producing 5-fluorooxyindole and for producing intermediate therefor

摘要

The present invention discloses a process for preparing 5-fluorooxindole represented by the formula (3): which comprises (A) a first step of cyclizing 2-(5-fluoro-2-nitrophenyl)malonic acid diester represented by the formula (1) : wherein R<1> and R<2> may be the same or different from each other and each represents a group which does not participate in the reaction, under reductive conditions to form 5-fluorooxindole-3-carboxylic acid ester represented by the formula (2): wherein R<1> has he same meaning as defined above, and (B) then, a second step of decarboxylating the 5-fluorooxindole-3-carboxylic acid ester, and a process for preparing its synthetic intermediates.