N-bromobutanimide → Benzyl(4aR,7aR)-2-(benzoylamino)-7a-(5-bromothiophen-2-yl)-4a,5,7,7a-tetrahydropyrrolo[3,4-d][1,3]thiazine-6(4H)-carboxylate

HRID 1619033Notes

Reaction equation

HRID 1619033 reaction equation
[C:1]([NH:9][C:10]1[S:11][CH2:12][C@@H:13]2[CH2:18][N:17]([C:19]([O:21][CH2:22][C:23]3[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=3)=[O:20])[CH2:16][C@:14]2([C:29]2[S:30][CH:31]=[CH:32][CH:33]=2)[N:15]=1)(=[O:8])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[Br:34]N1C(=O)CCC1=O>CN(C)C=O.C(OCC)(=O)C>[C:1]([NH:9][C:10]1[S:11][CH2:12][C@@H:13]2[CH2:18][N:17]([C:19]([O:21][CH2:22][C:23]3[CH:24]=[CH:25][CH:26]=[CH:27][CH:28]=3)=[O:20])[CH2:16][C@:14]2([C:29]2[S:30][C:31]([Br:34])=[CH:32][CH:33]=2)[N:15]=1)(=[O:8])[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1

Participants

5

Reactant 2

HCID 67184N-bromobutanimideHCID 86762220benzyl(4aR,7aR)-2-benzamido-7a-(2-thienyl)-4,4a,5,7-tetrahydropyrrolo[3,4-d][1,3]thiazine-6-carboxylate

Product 1

HCID 86762219Benzyl(4aR,7aR)-2-(benzoylamino)-7a-(5-bromothiophen-2-yl)-4a,5,7,7a-tetrahydropyrrolo[3,4-d][1,3]thiazine-6(4H)-carboxylateYield 92%

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideSolventHCID 8857Ethyl AcetateSolvent

Procedure

To a stirred clear and colorless solution of benzyl (4aR,7aR)-2-benzamido-7a-(2-thienyl)-4,4a,5,7-tetrahydropyrrolo[3,4-d][1,3]thiazine-6-carboxylate (1.67 g, 3.50 mmol) in dimethylformamide (35 mL) at room temperature, under an atmosphere of nitrogen is added N-bromosuccinimide (747 mg, 4.20 mmol). The resulting pale yellow solution is stirred at room temperature for 50 minutes. The solution is diluted with ethyl acetate (150 mL) and washed with water (3×50 mL) and brine (50 mL). The organic phase is separated, dried over sodium sulfate, filtered, and concentrated under reduced pressure. The residue is purified by silica gel flash chromatography eluting with a hexanes/ethyl acetate, gradient from 80:20 to 0:100, to give the title compound (1.79 g, 92%) as a white solid: ES/MS (m/z): 557.8 (M+H).

Workup

  1. washwashed with water (3×50 mL) and brine (50 mL)
  2. customThe organic phase is separated
  3. dry with materialdried over sodium sulfate
  4. filtrationfiltered
  5. concentrationconcentrated under reduced pressure
  6. customThe residue is purified by silica gel flash chromatography
  7. washeluting with a hexanes/ethyl acetate, gradient from 80:20 to 0:100

Sources & evidence

ORD record
ord-13afa0864b434d67a622fc6b9f48ede7
Source dataset
uspto-grants-2014_07
Patent number
US08772282B2

Reaction notes

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