| abstract |
(57) [Summary] [Object] An object of the present invention is to provide a method capable of producing NF-1616-904 substance in high yield and high purity. The method of the present invention has the general formula: [In the formula, R 1 represents a cyano lower alkyl group or the like. R 2 represents a hydrogen atom or the like. R 3 represents a hydrogen atom or the like. ] The indole derivative represented by the following formula is cyclized, then the obtained indole derivative is methylated, and R 1 which is the protecting group of the obtained indole derivative is removed. Is a method for producing the NF-1616-904 substance represented by. |