Phenol → Tert-butyl (R)-1-((4S,5R)-2-methyl-1-oxo-4-phenyl-2,7-diazaspiro[4.5]decan-7-yl)-1-oxo-4-phenoxybutan-2-ylcarbamate

Participants

Reaction Conditions

Reaction Steps

Tert-butyl (R)-4-hydroxy-1-((4S,5R)-2-methyl-1-oxo-4-phenyl-2,7-diazaspiro[4.5]decan-7-yl)-1-oxobutan-2-ylcarbamate (111 mg; 0.249 mmol) was solubilised in THF (2.5 ml). Phenol (24 mg; 0.249 mmol) was added followed by triphenylphosphine (98 mg; 0.374 mmol). The solution was cooled to 0° C. and diisopropyl azodicarboxylate (0.073 ml; 0.374 mmol) was added. The reaction mixture was warmed to RT slowly and stirred overnight. The solution was concentrated in vacuo and purified by chromatography on silica eluting with 0-10% MeOH in DCM with ammonia. The compound eluted with triphenylphospine oxide and was used crude in the next step.

Provenance & Evidence