Trityl chloride → HCID 67984870, compound

Reaction equation

[Br:1][C:2]1[C:10]2[C:5](=[CH:6][CH:7]=[C:8]([C:11]([O:13][CH2:14][CH3:15])=[O:12])[CH:9]=2)[NH:4][N:3]=1.[H-].[Na+].[C:18](Cl)([C:31]1[CH:36]=[CH:35][CH:34]=[CH:33][CH:32]=1)([C:25]1[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=1)[C:19]1[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=1>C1COCC1>[Br:1][C:2]1[C:10]2[C:5](=[CH:6][CH:7]=[C:8]([C:11]([O:13][CH2:14][CH3:15])=[O:12])[CH:9]=2)[N:4]([C:18]([C:19]2[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=2)([C:31]2[CH:32]=[CH:33][CH:34]=[CH:35][CH:36]=2)[C:25]2[CH:26]=[CH:27][CH:28]=[CH:29][CH:30]=2)[N:3]=1

Participants

Procedure

To a suspension of ethyl 3-bromo-1H-indazole-5-carboxylate (1032 g, 0.04 mol) in 160 mL of THF was added NaH (2.8 g, 0.068 mol) portion wise at 5-10 C under ice/water bath. The solution was stirred for 15 minutes further until no more bubling. Tritylchloride (14 g, 0.05 mol) was added in several portions. After the addition, the cooling bath was removed and the orange suspension was stirred at room temperature for overnight. The reaction mixture was poured slowly into 100 mL of saturated NH4Cl with stirring and 100 mL EtOAc. The layers were separated and the aqueous phase extracted with Ethyl acetate (2 Lx2). The combined organic layers were washed with water (100 mL), brine (100 mL), dried over Na2SO4, filter and concentrated. The solid was triturated with hexane (100 mL), filtered and washed with hexane and dried under vacuum to give 20 gram product as light yellow solid.