HCID 68411356, compound → (+/-)-4-(3-Aminopyridin-4-yl)-2-(tert-butoxycarbonylamino)-6-methylcyclohexyl acetate

Participants

Reaction Steps

To a degassed solution of (+/−)-2-(tert-butoxycarbonylamino)-6-methyl-4-(3-nitropyridin-4-yl)cyclohex-3-enyl acetate (1.0 equiv.) in MeOH and EtOAc (1:1, 0.1 M) was added 10% Pd/C (0.1 equiv.) and the reaction was stirred at room temperature under a hydrogen balloon for 3 days. Upon completion, the solution was filtered through a pad of Celite, the pad was washed with ethyl acetate and the filtrate was concentrated. The crude material contained about 10% of the undesired isomer. The crude was dissolved in ethyl acetate (˜20%) and hexanes and heated until all dissolved. The solution was allowed to sit at room temperature for 2 days. The precipitate was then collected to give (+/−)-4-(3-aminopyridin-4-yl)-2-(tert-butoxycarbonylamino)-6-methylcyclohexyl acetate as the pure product in 59% yield. LC/MS=364.3 (M+H), Rt=0.63 min. The racemic material was resolved using an AD-H chiral column (20% i-PrOH/80% n-heptanes, 20 mL/min flow rate) to (1S,2S,4S,6R)-4-(3-aminopyridin-4-yl)-2-((tert-butoxycarbonyl)amino)-6-methylcyclohexyl acetate (peak#1, Rt=3.76 min on AD-H chiral analytical column, 20% i-PrOH/80% n-heptanes, 1 mL/min) and (1R,2R,4R,6S)-4-(3-aminopyridin-4-yl)-2-((tert-butoxycarbonyl)amino)-6-methylcyclohexyl acetate (peak#2, Rt=6.79 min on AD-H chiral analytical column, 20% i-PrOH/80% n-heptanes, 1 mL/min)

Provenance & Evidence