[Cl:1][C:2]1[CH:3]=[CH:4][C:5]2[C:15](=[O:16])[C:10]3[N:11]=[C:12]([CH3:14])O[C:9]=3[CH:8]=[CH:7][C:6]=2[CH:17]=1.[CH3:18][NH2:19]>>[Cl:1][C:2]1[CH:3]=[CH:4][C:5]2[C:15](=[O:16])[C:10]3[N:11]=[C:12]([CH3:14])[N:19]([CH3:18])[C:9]=3[CH:8]=[CH:7][C:6]=2[CH:17]=1A mixture of the product from step (i) (3.33 g), and 40% w/v aqueous methylamine solution was heated at 40° C. for 4 h. The solid was filtered and washed with water then dried under vacuum to give the subtitled product as a cream powder.
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