2-Methyl-2-butene → 5-{4-[2-(azetidin-1-yl)-2-oxoethyl]phenyl}-6-chloro-1H-indole-3-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

To a solution of 5-{4-[2-(azetidin-1-yl)-2-oxoethyl]phenyl}-6-chloro-1H-indole-3-carbaldehyde (0.16 g, 0.453 mmol) in acetonitrile (8 mL) and tert-butanol (8 mL) was added 2-methyl-2-butene (8 mL). The reaction mixture was cooled to 0° C. and treated with a solution of sodium chlorite (456 mg, 5 mmol) and sodium phosphate monobasic dihydrate (1.06 g, 6.8 mmol) in water (6 mL). The reaction mixture was stirred for 2 hours at room temperature, and treated with additional sodium chlorite (607 mg, 6.67 mmol), sodium phosphate monobasic dihydrate (1.41 g, 9.04 mmol) and 2-methyl-2-butene (1 mL). The resulting mixture was stirred at room temperature overnight. The reaction mixture was partially evaporated in vacuo and extracted with EtOAc (30 mL×3). The combined organic layers were dried over sodium sulfate and concentrated in vacuo. The residue was purified via prep-HPLC to give 5-{4-[2-(azetidin-1-yl)-2-oxoethyl]phenyl}-6-chloro-1H-indole-3-carboxylic acid (25 mg) as a yellow solid.

Provenance & Evidence