Diisopropylethylamine → 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

Participants

Reaction Steps

2-Methyl-4-phenyl-2,7-diazaspiro[4.5]decan-1-one (100 mg; 0.409 mmol) was solubilised in acetonitrile (1.4 ml). (R)-2-(Tert-butoxycarbonylamino)-4-hydroxybutanoic acid (90 mg; 0.409 mmol) was added followed by diisopropylethylamine (0.286 ml; 1.637 mmol). ®T3P (50% solution in ethyl acetate) (0.478 ml; 0.819 mmol) was added and the mixture stirred at RT for 2 hr. The reaction was diluted with water and extracted with EtOAc; the organics were combined and washed with brine, dried over MgSO4, filtered and concentrated in vacuo. The residue was purified by chromatography on silica eluting with 0-10% MeOH in DCM with ammonia to afford 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.

Provenance & Evidence