反应详情

A 0° C. suspension of 2,2-dimethyltetrahydro-2H-pyran-4-amine (0.806 g, 6.24 mmol) in THF (30 mL) was treated drop-wise with 2-chloroethyl isocyanate (0.585 mL, 6.86 mmol), allowed to warm to RT as the cooling bath expired and stirred overnight. The mixture was treated with additional 2-chloroethyl isocyanate (160 μL) and stirred at RT for an additional 24 hours, then concentrated to dryness, the residue dissolved in EtOAc and washed with saturated NH4Cl (1×), NaHCO3 (1×) and brine (1×), dried over MgSO4 and concentrated to dryness to afford 1-(2-chloroethyl)-3-(2,2-dimethyltetrahydro-2H-pyran-4-yl)urea (700 mg, 48%) as a yellow oil. MS (ESI) m/z: 235.1 (M+H+).

1. stirringstirred at RT for an additional 24 hours
2. concentrationconcentrated to dryness
3. dissolutionthe residue dissolved in EtOAc
4. washwashed with saturated NH4Cl (1×), NaHCO3 (1×) and brine (1×)
5. dry with materialdried over MgSO4
6. concentrationconcentrated to dryness