Methanesulfonic Acid → ethyl 2-chloro-11-fluoro-12,12a-dihydro-6H-pyrido[2',3':5,6][1,3]oxazino[3,4-a]indole-6-carboxylate

HRID 595556Notes

Reaction equation

HRID 595556 reaction equation
[Cl:1][C:2]1[N:7]=[C:6]([CH:8]2[CH2:16][C:15]3[C:10](=[CH:11][CH:12]=[CH:13][C:14]=3[F:17])[NH:9]2)[C:5]([OH:18])=[CH:4][CH:3]=1.[CH2:19]([O:21][C:22](=[O:25])[CH:23]=O)[CH3:20].S(O)(C)(=O)=O>C1COCC1.O>[Cl:1][C:2]1[CH:3]=[CH:4][C:5]2[O:18][CH:23]([C:22]([O:21][CH2:19][CH3:20])=[O:25])[N:9]3[C:10]4[CH:11]=[CH:12][CH:13]=[C:14]([F:17])[C:15]=4[CH2:16][CH:8]3[C:6]=2[N:7]=1

Participants

6

Reactant 3

HCID 6395Methanesulfonic AcidHCID 70211Ethyl oxoacetateHCID 867262936-Chloro-2-(4-fluoroindolin-2-yl)pyridin-3-ol

Product 1

HCID 86728252ethyl 2-chloro-11-fluoro-12,12a-dihydro-6H-pyrido[2',3':5,6][1,3]oxazino[3,4-a]indole-6-carboxylateYield 90.5%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 8028TetrahydrofuranSolvent

Conditions

Temperature
50 °C

Procedure

To a solution of 6-chloro-2-(4-fluoroindolin-2-yl)pyridin-3-ol (8.53 g, 32.31 mmol) and glyoxylic acid ethyl ester (6.59 g, 64.59 mmol) in THF (80 mL), MsOH (0.31 g, 3.23 mmol) was added. The mixture was stirred at 50° C. for 2 hours. The mixture was diluted with water and extracted with EtOAc. The organic layer was washed with brine (30 mL), dried over Na2SO4 and concentrated. The residue was purified by column chromatography (PE: EtOAc=10:1) to afford ethyl 2-chloro-11-fluoro-12,12a-dihydro-6H-pyrido[2′,3′:5,6][1,3]oxazino[3,4-a]indole-6-carboxylate (10.2 g, yield: 90.3%). 1H-NMR (CDCl3, 400 MHz) δ 7.04˜7.13 (m, 3H), 6.63 (d, J=8.0 Hz, 1H), 6.55 (t, J=8.4 Hz, 1H), 6.03 (s, 1H), 5.09 (d, J=8.8 Hz, 1H), 4.22˜4.34 (m, 2H), 3.73 (d, J=16.4 Hz, 1H), 3.44˜3.51 (m, 1H), 1.29 (d, J=7.2 Hz, 3H). MS (M+H)+: 349.

Workup

  1. extractionextracted with EtOAc
  2. washThe organic layer was washed with brine (30 mL)
  3. dry with materialdried over Na2SO4
  4. concentrationconcentrated
  5. customThe residue was purified by column chromatography (PE: EtOAc=10:1)

Sources & evidence

ORD record
ord-f5572df3bb61454985113dfdc3449c84
Source dataset
uspto-grants-2016_01
Patent number
US09242998B2

Reaction notes

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