[CH3:1][O:2][C:3]1[CH:12]=[CH:11][C:10]2[C:5](=[CH:6][CH:7]=[C:8]([C:13]3[CH:18]=[CH:17][CH:16]=[C:15]([O:19][CH3:20])[CH:14]=3)[CH:9]=2)[C:4]=1[C:21]([OH:23])=O.[CH3:24][NH2:25]>>[CH3:1][O:2][C:3]1[CH:12]=[CH:11][C:10]2[C:5](=[CH:6][CH:7]=[C:8]([C:13]3[CH:18]=[CH:17][CH:16]=[C:15]([O:19][CH3:20])[CH:14]=3)[CH:9]=2)[C:4]=1[C:21]([NH:25][CH3:24])=[O:23]The compound was prepared by reaction of 2-methoxy-6-(3-methoxyphenyl)-1-naphthoic acid (300 mg, 0.97 mmol, 1 eq) with 33% methylamine (1 eq) according to method D. Purification by column chromatography was not necessary. The desired compound was obtained in quantitative yield (311 mg).
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