Triphenylphosphine → trans-2-Bromomethyl-N-cyanomethylcyclohexanecarboxamide

Participants

Reaction Steps

trans-N-Cyanomethyl-2-hydroxymethyl-cyclohexanecarboxamide (12.4 g, 63.2 mmol) and triphenylphosphine (19.9 g, 75.8 mmol) were weighed into a 1000 mL round bottom flask fitted with a stir bar, addition port and nitrogen inlet. A nitrogen atmosphere was established and maintained and then anhydrous tetrahydrofuran (300 mL) was added. The reaction mixture was stirred for 30 minutes at room temperature and N-bromosuccinimide (13.5 g, 75.8 mmol) was added to the flask. The reaction slowly cleared to an orange-red solution. The reaction mixture was stirred at room temperature for 18 h and then concentrated on a rotary evaporator. Product was purified from the residue by chromatography on 2360 cm3 of silica gel in a 10×30 cm column with ethyl acetate eluent. The product fractions were concentrated on a rotary evaporator and the residue dried under high vacuum to give trans-2-bromomethyl-N-cyanomethylcyclo-hexanecarboxamide as a white solid with a slight yellow tint.

Provenance & Evidence