Diisopropylethylamine → N-(8-methoxytetralin-2-yl)-N-propyl-2-(2,5-dimethylphenyl)acetamide

Participants

Reaction Steps

A mixture of 340 mg (2.1 mmol) 2,5-dimethylphenylacetic acid (A3-4: W=OH, Cy=2,5-dimethylphenyl) and 0.70 mL diisopropylethylamine (DIPEA) (4.24 mmol) in 10 mL of dry DMF was cooled in an ice-bath. After addition of 950 mg (2.5 mmol) O-(7-azabenzotriazol-1-yl)-1,1,3,3-tetramethyluronium hexafluorophosphate (HATU) in 5.0 mL dry DMF a solution of 640 mg (2.9 mmol) of the free base of N-(8-methoxytetralin-2-yl)-N-propylamine (A2-1) in 8.0 mL dry DMF was added dropwise, the ice-bath was removed and the reaction mixture was stirred for 3 hrs at room temperature. The mixture was washed with a saturated solution of aqueous NaHCO3 for several times and the resulting aqueous layer was extracted with CH2Cl2. The organic layers were dried over MgSO4 and the solvent was evaporated in vacuo. Flash chromatography of the residue on silica gel with a mixture of hexane/ethyl acetate 60/10 gave the product N-(8-methoxytetralin-2-yl)-N-propyl-2-(2,5-dimethylphenyl)acetamide.

Provenance & Evidence