Hydrochloric Acid → Ethyl 8-bromo-7-(4-(tert-butoxycarbonyl)-2-nitrophenoxy)-6-chlorochroman-4-carboxylate

HRID 1021405Notes

Reaction equation

HRID 1021405 reaction equation
[Br:1][C:2]1[C:3]([OH:18])=[C:4]([Cl:17])[CH:5]=[C:6]2[C:11]=1[O:10][CH2:9][CH2:8][CH:7]2[C:12]([O:14][CH2:15][CH3:16])=[O:13].F[C:20]1[CH:32]=[CH:31][C:23]([C:24]([O:26][C:27]([CH3:30])([CH3:29])[CH3:28])=[O:25])=[CH:22][C:21]=1[N+:33]([O-:35])=[O:34].C(=O)([O-])[O-].[K+].[K+].Cl>CN(C)C=O.C(Cl)(Cl)Cl.O>[Br:1][C:2]1[C:3]([O:18][C:20]2[CH:32]=[CH:31][C:23]([C:24]([O:26][C:27]([CH3:29])([CH3:30])[CH3:28])=[O:25])=[CH:22][C:21]=2[N+:33]([O-:35])=[O:34])=[C:4]([Cl:17])[CH:5]=[C:6]2[C:11]=1[O:10][CH2:9][CH2:8][CH:7]2[C:12]([O:14][CH2:15][CH3:16])=[O:13]

Participants

8

Reactant 4

HCID 313Hydrochloric AcidHCID 11430Potassium CarbonateHCID 58748597tert-Butyl 4-fluoro-3-nitrobenzoateHCID 67080498Ethyl 8-bromo-6-chloro-7-hydroxychroman-4-carboxylate

Product 1

HCID 67080517Ethyl 8-bromo-7-(4-(tert-butoxycarbonyl)-2-nitrophenoxy)-6-chlorochroman-4-carboxylateYield 65.4%

Reagents, catalysts & solvents 3

HCID 962WaterSolventHCID 6212ChloroformSolventHCID 6228DimethylformamideSolvent

Procedure

To a stirred solution of ethyl 8-bromo-6-chloro-7-hydroxychroman-4-carboxylate (4.00 g, 11.9 mmol) and tert-butyl 4-fluoro-3-nitrobenzoate (3.16 g, 13.1 mmol) in N,N-dimethylformamide (66 mL) at ambient temperature was added solid potassium carbonate (2.64 g, 19.1 mmol). The resulting mixture was stirred in an oil bath set to 90° C. for 30 minutes. The mixture was cooled to ambient temperature and poured into a separatory funnel containing water (600 mL). Chloroform (300 mL) was added, followed by 1M hydrochloric acid (100 mL). The organic layer was dried over sodium sulfate and concentrated. The residue was purified by chromatography on silica gel, eluting with 90/10 hexanes/ethyl acetate to afford ethyl 8-bromo-7-(4-(tert-butoxycarbonyl)-2-nitrophenoxy)-6-chlorochroman-4-carboxylate as a light yellow glass (4.33 g, 65% yield).

Workup

  1. additionpoured into a separatory funnel
  2. dry with materialThe organic layer was dried over sodium sulfate
  3. concentrationconcentrated
  4. customThe residue was purified by chromatography on silica gel
  5. washeluting with 90/10 hexanes/ethyl acetate

Sources & evidence

ORD record
ord-6a455a20172845869550e7a479497b3f
Source dataset
uspto-grants-2014_05
Patent number
US08716498B2

Reaction notes

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