反应详情

To a stirred solution of 4-methyl 1-tert-butyl(2S,3R)-2-allyl-3-({benzyl[(benzyloxy)cabonyl]amino}methyl)butanedioate (2.336 g, 4.851 mmol) in dichloromethane (97 mL) at −78° C. was bubbled ozone. After the solution turned blue, ozone bubbling continued for additional 15 min. Nitrogen was then bubbled into the mixture until the blue color disappeared. The reaction was quenched with dimethyl sulfide (1.78 mL, 24.26 mmol) and the solution was stirred at rt for 2 h. The solvent was removed under reduced pressure and the residue was purified by Combiflash (15-25% EtOAc/hexane) to provide 1.853 g (79%) of 1-methyl 4-tert-butyl(2R,3S)-2-({benzyl[(benzyloxy)cabonyl]amino}methyl)-3-(2-oxoethyl)butanedioate as a colorless viscous oil (1.853 g, 79% in yield). MS (ESI): 506.1 (M+Na+).

1. customNitrogen was then bubbled into the mixture until the blue color
2. customThe solvent was removed under reduced pressure
3. customthe residue was purified by Combiflash (15-25% EtOAc/hexane)
4. customto provide