Patent ID: 7790885

Claim:
A process for preparing a compound represented by the formula (I): comprising reacting a compound represented by the formula (II) or salt thereof: with a compound represented by the formula (III): in the presence of a condensation reagent, wherein R 1 represents 1) azetidin-l-yl optionally substituted with a substituent selected from Substituent Group A, 2) pyrrolidin-1-yl optionally substituted with a substituent selected from Substituent Group A, 3) piperidin-1-yl optionally substituted with a substituent selected from Substituent Group A, 4) piperazin-1-yl optionally substituted with a substituent selected from Substituent Group A, 5) diazepan-1-yl optionally substituted with a substituent selected from Substituent Group A, 6) morpholin-4-yl optionally substituted with a substituent selected from Substituent Group A, or 7) —NR 11a R 11b , wherein R 11a represents hydrogen or methyl, and R 11b represents n-propyl, n-butyl, pyrrolidin-3-yl, piperidin-3-yl, piperidin-4-yl or tetrahydropyran-4-yl, and R 11b may be substituted with a substituent selected from Substituent Group B; R 2 , R 3 , R 4 and R 5 may be the same or different and each represents hydrogen or fluorine; Substituent Group A consists of hydroxyl, dimethylaminoacetoxy, methyl, ethyl, dimethylamino, azetidinyl, pyrrolidinyl, piperidinyl and piperazinyl, where each group included in Substituent Group A other than hydroxyl and dimethylaminoacetoxy may be substituted with hydroxyl, methyl, dimethylamino, azetidinyl, pyrrolidinyl or piperidinyl; Substituent Group B consists of methyl, ethyl, n-propyl, acetyl, dimethylamino, diethylamino, azetidinyl, pyrrolidinyl and piperazinyl, where each group included in Substituent Group B may be substituted with methyl or dimethylamino; and R 6 represents hydrogen or fluorine.