methyl [(2-methylpropan-2-yl)oxycarbonylamino] carbonate

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of tert-butyl N-hydroxycarbamate (1.4 g, 10.6 mmol) in DCM (10 ml) is added triethylamine (1.5 ml, 10.6 mmol) at 0° C. Methyl choroformate (814 μl, 10.6 mmol) is added drop wise. Reaction stirred for 18 hours at room temperature before being washed with water (2×10 ml), NaHCO3 (2×10 ml), dried over magnesium sulfate and concentrated in vacuo to give the title product as an oil. (1.76 g, 87%), 1H NMR (500 MHz, CHLOROFORM-d) δ ppm 7.71 (1H, br. s.), 3.92 (3H, s), 1.50 (9H, s). Reaction before being washed with water (2×10 ml), NaHCO3 (2×10 ml) dried over magnesium sulfate concentrated in vacuo