Diisopropylethylamine → tert-butyl N-[N-[3-(2,4,6-trimethylphenyl)propanoyl]carbamimidoyl]carbamate

Participants

Reaction Steps

3-Mesitylpropionic acid (4.40 g; 23 mmol), diisopropylethylamine (14.8 g; 115 mmol), tert-butyl amino(imino)methylcarbamate (4.40 g; 28 mmol), and 1-hydroxybenzotriazole monohydrate (4.22 g; 28 mmol) were dissolved in N,N-dimethylformamide (92 mL), 2-(1H)-benzotriazol-1-yl-1,1,3,3-tetramethyluronium hexafluorophosphate (10.5 g; 28 mmol) was added thereto, and the mixture was stirred for 17 hours at room temperature. To the reaction solution, ethyl acetate (300 mL) was added, and the mixture was washed with 10% aqueous citric acid solution, brine, saturated aqueous sodium bicarbonate solution, and then brine. The organic layer was dried over anhydrous magnesium sulfate and then distilled under reduced pressure. The resulting oily substance was crystallized from diethyl ether/diisopropyl ether, collected by filtration and dried to give 7.10 g of the title compound (yield 93%).

Provenance & Evidence