[CH:1]1[C:13]2[NH:12][C:11]3[C:6](=[CH:7][CH:8]=[CH:9][CH:10]=3)[C:5]=2[CH:4]=[CH:3][CH:2]=1.Br[CH2:15][C:16]([O:18][C:19]([CH3:22])([CH3:21])[CH3:20])=[O:17].C(O[K])(C)(C)C.C(O)(=O)C(O)=O>CN(C)C=O>[C:19]([O:18][C:16]([CH2:15][N:12]1[C:11]2[CH:10]=[CH:9][CH:8]=[CH:7][C:6]=2[C:5]2[C:13]1=[CH:1][CH:2]=[CH:3][CH:4]=2)=[O:17])([CH3:22])([CH3:21])[CH3:20]100 g of carbazole, 117 g of t-butyl bromoacetate, and 67 g of t-butoxy potassium were dissolved in 1,000 g of dimethylformamide. The mixture was reacted overnight at room temperature. After the addition of 300 g of 5 wt % oxalic acid aqueous solution, the reaction mixture was extracted with 2,000 g of n-hexane. Precipitate obtained by crystallization in a mixed solvent of 500 g of dimethylformamide and 500 g of n-hexane was dried under vacuum to obtain 79 g of N-(t-butoxycarbonylmethyl)carbazole as a white solid. This compound is indicated as “other dye (D-2)”.
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