C1(SSC2C=CC=CC=2)C=CC=CC=1.[F:15][C:16]1[CH:21]=[CH:20][C:19]([C:22]2[C:31]3[C:26](=[C:27]([CH3:32])[CH:28]=[CH:29][CH:30]=3)[CH2:25][CH2:24][N:23]=2)=[CH:18][CH:17]=1>>[F:15][C:16]1[CH:21]=[CH:20][C:19]([C:22]2[C:31]3[C:26](=[C:27]([CH3:32])[CH:28]=[CH:29][CH:30]=3)[CH:25]=[CH:24][N:23]=2)=[CH:18][CH:17]=1Diphenyl disulfide was reacted with 1-(4-fluorophenyl)-5-methyl-3,4-dihydroisoquinoline in the same way as in step (c) of Example 1 to afford 1-(4-fluorophenyl)-5-methylisoquinoline as colorless needles having a melting point of 91° to 92° C.
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