Ethyl Acetate → tert-butyl 2(R)-[(3,4-methylendioxybenzyl)-(2,6-dimethyl-4-methoxybenzenesulfonyl)amino]-3-methanesulfonylamino-propionate

HRID 1006123Notes

Reaction equation

HRID 1006123 reaction equation
[CH2:1]1[O:34][C:33]2[CH:32]=[CH:31][C:5]([CH2:6][N:7]([S:18]([C:21]3[C:26]([CH3:27])=[CH:25][C:24]([O:28][CH3:29])=[CH:23][C:22]=3[CH3:30])(=[O:20])=[O:19])[C@H:8]([CH2:16][NH2:17])[C:9]([O:11][C:12]([CH3:15])([CH3:14])[CH3:13])=[O:10])=[CH:4][C:3]=2[O:2]1.C[Si](C#N)(C)C.[CH3:41][S:42](Cl)(=[O:44])=[O:43].C(OCC)(=O)C>C(#N)C>[CH2:1]1[O:34][C:33]2[CH:32]=[CH:31][C:5]([CH2:6][N:7]([S:18]([C:21]3[C:22]([CH3:30])=[CH:23][C:24]([O:28][CH3:29])=[CH:25][C:26]=3[CH3:27])(=[O:20])=[O:19])[C@H:8]([CH2:16][NH:17][S:42]([CH3:41])(=[O:44])=[O:43])[C:9]([O:11][C:12]([CH3:13])([CH3:14])[CH3:15])=[O:10])=[CH:4][C:3]=2[O:2]1

Participants

6

Reactant 4

HCID 8857Ethyl AcetateHCID 31297Methanesulfonyl chlorideHCID 82115Trimethylsilyl cyanideHCID 69762296tert-butyl 2(R)-[(3,4-methylendioxybenzyl)-(2,6-dimethyl-4-methoxybenzenesulfonyl)amino]-3-amino-propionate

Product 1

HCID 18337582tert-butyl 2(R)-[(3,4-methylendioxybenzyl)-(2,6-dimethyl-4-methoxybenzenesulfonyl)amino]-3-methanesulfonylamino-propionateYield 122.7%

Reagents, catalysts & solvents 1

HCID 6342AcetonitrileSolvent

Procedure

To a mixture of tert-butyl 2(R)-[(3,4-methylendioxybenzyl)-(2,6-dimethyl-4-methoxybenzenesulfonyl)amino]-3-amino-propionate (1.02 g, 2.0 mmol), with trimethylsilyl cyanide (0.7 ml, 5.2 mmol) in dry acetonitrile (15 ml) was added methanesulfonyl chloride (0.18 ml, 2.3 mmol) and the material was stirred overnight. Ethyl acetate (80 ml) was added and the material was partitioned with aqueous hydrochloric acid (1.5%, 80 ml). The organic phase was collected and washed with an equal volume of brine; The aqueous phases were back extracted with ethyl acetate (2×80 ml) and the organic phases combined, dried (MgSO4), filtered and condensed to provide tert-butyl 2(R)-[(3,4-methylendioxybenzyl)-(2,6-dimethyl-4-methoxybenzenesulfonyl)amino]-3-methanesulfonylamino-propionate as a pale yellow semi-viscous oil (1.4 g).

Workup

  1. customthe material was partitioned with aqueous hydrochloric acid (1.5%, 80 ml)
  2. customThe organic phase was collected
  3. washwashed with an equal volume of brine
  4. extractionThe aqueous phases were back extracted with ethyl acetate (2×80 ml)
  5. dry with materialdried (MgSO4)
  6. filtrationfiltered
  7. customcondensed

Sources & evidence

ORD record
ord-e170b1045e454c7d8d342e66d2f0ad48
Source dataset
uspto-grants-2004_09
Patent number
US06787559B2

Reaction notes

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