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 338131Notes

Reaction equation

HRID 338131 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-fb02c9c0550d47d9b6bf49990890e5f5
Source dataset
uspto-grants-2014_11
Patent number
US08889856B2

Reaction notes

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