Diisopropylamine → Benzamide

Participants

Reaction Conditions

Reaction Steps

1-benzylpyrrolidine-3-amine represented by Formula 102 (180 mg, 1.02 mmol) was slowly added to a solution of 4-benzyloxy-3,4-dimethoxybenzoic acid represented by Formula 89 (323.88 mg, 1.12 mmol) prepared in Preparative Example 1 as well as diisopropylamine (0.71 mL, 4.09 mmol) in DMF (7 mL) at room temperature. The reaction mixture was cooled to 0° C. and, after adding 2-(1H-7-azabenzotriazol-1-yl)-1,1,3,3-tetramethyluronium hexafluorophosphate methanaminium (HATU, 388.29 mg, 1.02 mmol) thereto, the mixture was agitated at room temperature for 24 hours. After removing the reaction solvent under reduced pressure, chloroform (20 mL) was added to the remaining concentrate to form a solution, the solution was washed with a potassium carbonate solution, followed by separation to form an organic layer. The organic layer was dried with sodium sulfate (Na2SO4) and the solvent was removed again under reduced pressure. The obtained vacuum-concentrated mixture was subjected to separation and purification through column chromatography (ethyl acetate/hexane/triethylamine, 2:1:0.1, v/v/v) using silica gel (SiO2), resulting in a benzamide compound represented by Formula 12 as a desired product (VVZ-013; 392.9 mg, 86% yield).

Provenance & Evidence