Triethylamine → 1,1-Dimethylethyl (9S)-9-[[(phenylmethoxy)carbonyl]amino]-1-oxa-7-azaspiro[4.4]nonane-7-carboxylate

Participants

Reaction Conditions

Reaction Steps

To a solution of 0.80 g of the diol of step D in 15 mL of dichloromethane at 0° C. were added 0.2 mL of methanesulfonyl chloride and 0.8 mL of triethylamine. After being stirred for 1 hour, the mixture was refluxed at 60° C. overnight. Solvent was removed under vacuum. The residue was taken up in EtOAc/water and the two phases were separated. The water phase was extracted with EtOAc twice. The combined organic was dried over Na2SO4. Solvent was removed under vacuum. Column chromatography on silica gel using 15% EtOAc/hexane to 100% EtOAc as eluent provided 0.32 g of the title compound. MS (M+H)+ 377.

Provenance & Evidence