1,2-Dichloroethane → tert-butyl (1R,2S,3S,5R)-5-(3-(6-(2,6-difluorophenyl)-5-fluoropicolinamido)pyridin-4-yl)-2-hydroxy-3-methylcyclohexylcarbamate

Participants

Reaction Steps

To a solution of (3aR,5R,7S,7aS)-tert-butyl 5-(3-aminopyridin-4-yl)-7-methyl-2-oxohexahydrobenzo[d]oxazole-3(2H)-carboxylate (1.0 equiv.) in DMF (0.2 M) was added 6-(2,6-difluorophenyl)-5-fluoropicolinic acid (1.3 equiv.), aza-HOBt (1.3 equiv.) and EDC (1.3 equiv.). The mixture was stirred at rt for 16 hrs. The solution was diluted with EtOAc, washed with H2O, 1N NaOH, NaCl(sat.), dried over MgSO4, filtered and concentrated to yield crude protected amide. The material was dissolved in EtOH (0.45 M), Cs2CO3 (1.0 equiv.) was added and the solution was submerged in a 60° C. oil bath and stirred for 90 mins. The volatiles were removed in vacuo; the residue was partitioned between with EtOAc and H2O. The organic layer was washed with NaCl(sat.), dried over MgSO4, filtered, concentrated and pumped on to yield tert-butyl (1R,2S,3S,5R)-5-(3-(6-(2,6-difluorophenyl)-5-fluoropicolinamido)pyridin-4-yl)-2-hydroxy-3-methylcyclohexylcarbamate in 100% yield. LC/MS (m/z)=557.3 (MH+), Rt=0.83 min.

Provenance & Evidence