Pyridine → N-nitroso-N-(tert-butoxycarbonyl)amino-cyclopropane

Participants

Reaction Conditions

Reaction Steps

A solution of cyclopropyl-carbamic acid tert-butyl ester (4.8 g, 30.5 mmol) and pyridine (5.9 mL, 73 mmol) in acetonitrile (75 mL) was cooled to approximately −25° C. in a carbon tetrachloride/dry ice bath. Nitrosonium tetrafluoroborate (4.7 g, 40.2 mmol) was added over a period of 20 min. The cooling bath was removed and the reaction mixture was stirred in an ice-bath at 0° C. for 2.5 h. Water (100 mL) and ethyl acetate (500 mL) were added and the organic layer was washed with water (100 mL), 2 M aqueous HCl (50 mL) and brine (100 mL), dried (magnesium sulfate), filtered, evaporated, and purified in two batches using an ISCO 120 g column, eluting with 10-30% ethyl acetate, to give N-nitroso-N-cyclopropyl-carbamic acid tert-butyl ester (1.5 g, 26%) as a yellow oil.

Provenance & Evidence