benzyl N-(2-{6,6-dimethyl-1-[2-(trimethylsilyl)ethoxymethyl]-4,5,6,7-tetrahydro-1H-indazol-3-yl}-1-[2-(trimethylsilyl)ethoxymethyl]-1H-indol-6-yl)-N-ethylcarbamate → N-(2-{6,6-dimethyl-1-[2-(trimethylsilyl)ethoxymethyl]-4,5,6,7-tetrahydro-1H-indazol-3-yl}-1-[2-(trimethylsilyl)ethoxymethyl]-1H-indol-6-yl)-N-ethylamine

Participants

Reaction Steps

Under a nitrogen atmosphere, benzyl N-(2-{6,6-dimethyl-1-[2-(trimethylsilyl)ethoxymethyl]-4,5,6,7-tetrahydro-1H-indazol-3-yl}-1-[2-(trimethylsilyl)ethoxymethyl]-1H-indol-6-yl)-N-ethylcarbamate was obtained in the same manner as in Example 1, Step 6, from benzyl (2-{6,6-dimethyl-1-[2-(trimethylsilyl)ethoxymethyl]-4,5,6,7-tetrahydro-1H-indazol-3-yl}-1-[2-(trimethylsilyl)ethoxymethyl]-1H-indol-6-yl)carbamate obtained in Example 1, Step 5. To a solution of the obtained benzyl N-(2-{6,6-dimethyl-1-[2-(trimethylsilyl)ethoxymethyl]-4,5,6,7-tetrahydro-1H-indazol-3-yl}-1-[2-(trimethylsilyl)ethoxymethyl]-1H-indol-6-yl)-N-ethylcarbamate (979 mg, 1.4 mmol) in methanol (8 ml) was added 20% palladium hydroxide-carbon (400 mg). Then, the mixture was stirred under a hydrogen atmosphere at normal pressure for 1.5 hr. After the reaction, the reaction mixture was filtered through celite, and the filtrate was concentrated under reduced pressure. The residue was purified by silica gel chromatography to give the title compound (802 mg, yield 100%).

Provenance & Evidence