Isopropyl isocyanate → 4-(1-Isopropylaminocarbonylpiperidin-4-ylmethyl)-phenylamine

Participants

Reaction Steps

A solution of 4-(piperidin-4-ylmethyl)-phenylamine (0.57 g, 3 mmol) in dichloromethane (20 mL) was cooled in an ice bath under nitrogen atmosphere. Isopropyl isocyanate (0.28 g, 3.3 mmol) was added dropwise to the solution and stirred at ice bath temperature for 30 minutes. The reaction mixture was quenched with water and extracted with dichloromethane. The combined organic extracts were washed with water and brine, dried, and solvents removed in vacuo. The crude product was chromatographed on silica gel, eluting with 2% methanol/dichloromethane containing 0.01% ammonium hydroxide, to give 4-(1-isopropylaminocarbonylpiperidin-4-ylmethyl)-phenylamine (0.66 g, 80%) as a gum.

Provenance & Evidence