Triethylamine → HCID 59764404, compound

Participants

Reaction Steps

To a solution of 2-chloro-4-isopropoxy-5-nitro-benzoic acid (Intermediate 8, 10 g, 38.5 mmol) in DCM (200 mL) and DMF (1 mL), is slowly added thionyl chloride (9.17 g, 77 mmol) via a syringe. The mixture is stirred for 3 hours, and is then concentrated to dryness. The obtained white solid, 2-chloro-4-isopropoxy-5-nitro-benzoyl chloride, is dried under vacuum. To a mixture of 4-amino-piperidine-1-carboxylic acid tert-butyl ester (1.44 g, 7.2 mmol) and triethylamine (3 mL, 21.6 mmol) in DCM (100 mL), is slowly added 2-chloro-4-isopropoxy-5-nitro-benzoyl chloride (2 g, 7.2 mmol) dissolved in DCM (10 mL) via syringe. The mixture is stirred at room temperature for 3 hours, and then is concentrated. The obtained solid is dissolved in ethyl acetate and is washed with water and brine respectively. After evaporation of the solvent, the title compound is obtained as light yellow solid, and is directly used for the next step without further purification.

Provenance & Evidence