Piperidine → tert-butyl (Z)-4-({2-[(5-chloro-1H-indol-3-yl)methylene]-6-hydroxy-3-oxo-2,3-dihydrobenzofuran-7-yl}methyl)piperazine-1-carboxylate

Participants

Reaction Conditions

Reaction Steps

A solution of tert-butyl 4-[(6-hydroxy-3-oxo-2,3-dihydrobenzofuran-7-yl)methyl]piperazine-1-carboxylate (0.100 g, 0.287 mmol) obtained in Example A16, Step 1 in methanol (1.2 mL) was added with 5-chloro-1H-indole-3-carboxaldehyde (0.0515 g, 0.287 mmol) and piperidine (0.00244 g, 0.0287 mmol), and the mixture was stirred at 60° C. for 3 hours. The reaction mixture was cooled to room temperature, and added with methanol (4 mL), and the solid was suspended in methanol and thereby washed to obtain tert-butyl (Z)-4-({2-[(5-chloro-1H-indol-3-yl)methylene]-6-hydroxy-3-oxo-2,3-dihydrobenzofuran-7-yl}methyl)piperazine-1-carboxylate (0.0730 g, 49%).

Provenance & Evidence