Triphenylphosphine → (1S,3S,4S)-4-azido-N,N-dibenzyl-3-methylcyclohexanamine (1R,3R,4R)-4-azido-N,N-dibenzyl-3-methylcyclohexanamine

Participants

Reaction Conditions

Reaction Steps

A mixture of DIAD (5.03 mL, 25.9 mmol) and triphenylphosphine (6.78 g, 25.9 mmol) in THF (35 mL) was allowed to form a salt. After 30 min a solution of (1R,2S,4S)-4-(dibenzylamino)-2-methylcyclohexanol/(1S,2R,4R)-4-(dibenzylamino)-2-methylcyclohexanol (2 g, 6.46 mmol) and diphenyl phosphorazidate (2.507 mL, 11.63 mmol) in THF (25 mL) was added and the mixture was stirred for 20 hr at 55° C. The mixture was cooled to ambient temperature and diluted with EtOAc and brine. The separated organic layer was dried over Na2SO4, filtered off and concentrated in vacuo providing crude (1S,3S ,4S)-4-azido-N,N-dibenzyl-3-methylcyclohexanamine/(1R,3R,4R)-4-azido-N,N-dibenzyl-3-methylcyclohexanamine as orange oil, which was directly used in the next step without further purification. LCMS (m/z): 335.1 [M+H]+; Retention time=0.81 min.

Provenance & Evidence