Benzoin → 2-Cyanoethyl 1-{[(alpha-Benzoylbenzyloxy)carbonyl]aminomethyl}-1-Cyclohexane Acetate

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A solution of benzoin (0.599 mmol) and 2-cyanoethyl 1-isocyanatomethyl-1-cyclohexane acetate (7) (0.599 mmol) in 10 mL of anhydrous toluene was refluxed overnight. The reaction mixture was concentrated and the residue purified on silica gel (40% ethyl acetate in hexane) to afford 230 mg (83%) of the title compound. 1H NMR (CDCl3): δ 7.95 (2H, dd, J=8.2, 1.4 Hz); 7.50-7.46 (3H, m); 7.41 (5H, m); 6.84 (1H, s); 5.40 (1H, t, J=6.8 Hz); 4.26 (2H, m); 3.24 (2H, d, J=6.8 Hz); 2.68 (2H, dt, J=2.4, 6.4 Hz); 2.36 (2H, d, J=1.2 Hz); 1.52-1.37 (10H, m).

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