methylene chloride mp 81 u00b0 82 u00b0 c to a stirred slurry of benzyloxyamine hydrochloride 3 19 g 20 mmol in the thf 40 ml at room temperature under nitrogen was added triethylamine 6 13 ml this slurry was stirred and dimethylcarbamyl chloride 1 84 ml was added rapidly 4 n n dimethylamino pyridine 1 0 g 0 4 equiv was added and the mixture was stirred for 20 hours the mixture was filtered and the filtrate evaporated purification by chromatography on silica provided n n dimethyl n 39 benzyloxyurea as a colorless oil 1 62 g 42 yield to a solution of this urea 1 59 g 8 19 mmol in dmf 13 ml at 50 u00b0 c under nitrogen was added sodium hydride 360 mg of a 60 dispersion in oil the resulting solution was stirred for 45 minutes and 1 bromooctane 1 83 ml was added after 16 hours the mixture was poured into 1 aqueous citric acid 75 ml and extracted 3 times with 1 1 hexane ether the combined extracts were dried mgso 4 filtered and evaporated purification by chromatography on silica provided n benzyloxy n octyl n 39 n 39 dimethylurea as a colorless oil 2 04 g 81 yield hydrogenolysis as in example 2 above and recrystallization from hexane at 40 u00b0 c provided the title compound as a white solid 875 mg 57 yield mp 29 u00b0 30 u00b0 c using the method of example 7.