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), 1.84 (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