Cyclopropyl isothiocyanate → N-((1R) 1-benzyl-2-(3-cyclopropylthioureido)ethyl)-N-methylcarbamic acid tert-butylester

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

At 0° C., cyclopropylisothiocyanate (0.32 ml) was added to a solution of N-((1R)-1-aminomethyl-2-phenylethyl)-N-methylcarbamic acid tert-butylester (410 mg, 1.6 mmol) in dichloromethane (4 ml). The reaction mixture was first stirred at 0° C. for 10 min, and successively for 2.5 h at room temperature. The solvent were removed in vacuo. The crude product was purified by flash chromatography on silica (50 g) using ethyl acetate/heptane as eluent to give 492 mg of N-((1R) 1-benzyl-2-(3-cyclopropylthioureido)ethyl)-N-methylcarbamic acid tert-butylester.

Herkunft & Nachweise