Cesium carbonate → benzyl (S)-1-((1S,2S,4R)-4-hydroxy-2-isopropylcyclohexyl)-2-oxopyrrolidin-3-ylcarbamate

HRID 1171534Notes

Reaction equation

HRID 1171534 reaction equation
[Si:1]([O:8][C@@H:9]1[CH2:14][CH2:13][C@H:12]([NH:15][C:16](=[O:33])[C@@H:17]([NH:22][C:23](=[O:32])[O:24][CH2:25][C:26]2[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=2)[CH2:18][CH2:19]SC)[C@H:11]([CH:34]([CH3:36])[CH3:35])[CH2:10]1)([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2].C([O-])([O-])=O.[Cs+].[Cs+]>IC.CS(C)=O>[OH:8][C@@H:9]1[CH2:14][CH2:13][C@H:12]([N:15]2[CH2:19][CH2:18][C@H:17]([NH:22][C:23](=[O:32])[O:24][CH2:25][C:26]3[CH:27]=[CH:28][CH:29]=[CH:30][CH:31]=3)[C:16]2=[O:33])[C@H:11]([CH:34]([CH3:35])[CH3:36])[CH2:10]1.[Si:1]([O:8][C@@H:9]1[CH2:14][CH2:13][C@H:12]([N:15]2[CH2:19][CH2:18][C@H:17]([NH:22][C:23](=[O:32])[O:24][CH2:25][C:26]3[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=3)[C:16]2=[O:33])[C@H:11]([CH:34]([CH3:36])[CH3:35])[CH2:10]1)([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2]

Participants

6

Reactant 2

HCID 10796Cesium carbonateHCID 86596868benzyl (S)-1-((1S,2S,4R)-4-(tert-butyldimethylsilyloxy)-2-isopropylcyclohexylamino)-4-(methylthio)-1-oxobutan-2-ylcarbamate

Product 2

HCID 86596869benzyl (S)-1-((1S,2S,4R)-4-hydroxy-2-isopropylcyclohexyl)-2-oxopyrrolidin-3-ylcarbamateHCID 86596870benzyl (S)-1-((1S,2S,4R)-4-(tert-butyldimethylsilyloxy)-2-isopropylcyclohexyl)-2-oxopyrrolidin-3-ylcarbamate

Reagents, catalysts & solvents 2

HCID 679Dimethyl SulfoxideSolventHCID 6328Methyl iodideSolvent

Procedure

Benzyl (S)-1-((1S,2S,4R)-4-(tert-butyldimethylsilyloxy)-2-isopropylcyclohexylamino)-4-(methylthio)-1-oxobutan-2-ylcarbamate (5.3 g) was dissolved in iodomethane (90 mL), and the resulting solution was stirred at rt for 72 h before being concentrated in vacuo. The residue was dissolved in methylene chloride, and the resulting solution was concentrated; this was repeated to afford the salt. MS found: (M+H)+=586.5. This material was dissolved in DMSO (30 mL) and the solution was charged with Cs2CO3 (12.7 g). After 6 h, the reaction was partitioned between EtOAc and brine. The organic phase was dried (MgSO4), filtered, and concentrated in vacuo. The residue was purified by flash chromatography to afford benzyl (S)-1-((1S,2S,4R)-4-hydroxy-2-isopropylcyclohexyl)-2-oxopyrrolidin-3-ylcarbamate [580 mg; MS found: (M+H)+=375.3] and benzyl (S)-1-((1S,2S,4R)-4-(tert-butyldimethylsilyloxy)-2-isopropylcyclohexyl)-2-oxopyrrolidin-3-ylcarbamate [1.0 g; MS found: (M+H)+=489.4].

Workup

  1. concentrationbefore being concentrated in vacuo
  2. dissolutionThe residue was dissolved in methylene chloride
  3. concentrationthe resulting solution was concentrated
  4. customto afford the salt
  5. waitAfter 6 h
  6. customthe reaction was partitioned between EtOAc and brine
  7. dry with materialThe organic phase was dried (MgSO4)
  8. filtrationfiltered
  9. concentrationconcentrated in vacuo
  10. customThe residue was purified by flash chromatography

Sources & evidence

ORD record
ord-45aebb3927b64b5d82d0de76cdae993b
Source dataset
uspto-grants-2010_11
Patent number
US07829571B2

Reaction notes

Loading…