Trimethylsilyl isocyanate → HCID 21930997, compound

Participants

Reaction Conditions

Reaction Steps

3-(2-tert-Butoxycarbonylaminoethyl)piperidine (500 mg, 2.19 mmoles) was dissolved in anhydrous dichloromethane (10 mL) and trimethylsilylisocyanate (2.96 mL, 21.9 mmoles) was added. The mixture was stirred under argon at 25° C. for 3.35 h. The mixture was diluted with dichloromethane and washed with saturated aqueous sodium bicarbonate. The organic layer was dried (MgSO4), filtered, evaporated to dryness and chromatographed on a silica gel column (15×5 cm) using 5% (10% conc. ammonium hydroxide in methanol)-dichloromethane as the eluant to give 3-(2-tert-butoxycarbonylaminoethyl)piperidine-1-carboxamide (417.7 mg, 70%): FABMS: m/z 272.0 (MH+); HRFABMS: m/z 272.1979 (MH+). Calcd. for C13H26O3: m/z 272.1974; δH (CDCl3) 1.16 (1H, m, CH2), 1-30-1.60 (5H, m, CH/CH2), 1.46 (9H, s, —COOC(CH3)3), 1.68 (1H, m, CH2), 184 (1H, m, CH2), 2.54 (1H, dd, CH2), 2.73 (1H, m, CH2), 3.08 (1H, m, CH2), 3.42 (1H, m, CH2), 4.02 (1H, m, CH2), 4.10 (1H, m, CH2), 4.84 (1H, m, NH) and 4.96 ppm (2H, bm, CONH2); δC (CDCl3) CH3: 28.5, 28.5, 28.5; CH2: 25.2, 31.7, 34.9, 37.3, 44.6, 50.3; CH: 32.9; C: 79.5, 156.4, 158.2.

Provenance & Evidence