| abstract |
Disclosed is a novel method for producing [{(5Z,7E)-(1S,3R,20S)-1,3-dihydroxy-9,10-secopregna-5,7,10(19),16-tetraen-20-yl}oxy]-N-(2,2,3,3,3-pentafluoropropyl) acetamide which is characterized by ring-opening a compound represented by the following formula: [Chemical formula 1] by irradiation of ultraviolet light, and then isomerizing the resulting ring-opened compound. Also disclosed are an intermediate useful for such a production method, and a method for producing such an intermediate. |