tert-butyl (Z)-4-({6-hydroxy-2-[(6-nitro-1H-indol-3-yl)methylene]-3-oxo-2,3-dihydrobenzofuran-7-yl}methyl)piperazine-1-carboxylate → tert-butyl (Z)-4-({2-[(6-amino-1H-indol-3-yl)methylene]-6-hydroxy-3-oxo-2,3-dihydrobenzofuran-7-yl}methyl)piperazine-1-carboxylate

Participants

Reaction Steps

A solution of tert-butyl (Z)-4-({6-hydroxy-2-[(6-nitro-1H-indol-3-yl)methylene]-3-oxo-2,3-dihydrobenzofuran-7-yl}methyl)piperazine-1-carboxylate (0.025 g, 0.048 mmol) obtained in Example A24, Step 2 in ethanol (2.0 mL) was added with Lindlar's catalyst (0.010 mg) under an argon atmosphere, and then the inside of the reaction vessel was replaced with hydrogen. The reaction mixture was stirred at room temperature for 5 hours, and then filtered through Celite, and the solvent was evaporated under reduced pressure to obtain tert-butyl (Z)-4-({2-[(6-amino-1H-indol-3-yl)methylene]-6-hydroxy-3-oxo-2,3-dihydrobenzofuran-7-yl}methyl)piperazine-1-carboxylate (0.023 g, 97%).

Provenance & Evidence