Potassium Carbonate → (S)-3-bromo-7-(2-fluoropyridin-3-yl)-2',6'-dihydrospiro[chromeno[2,3-b]pyridine-5,3'-[1,4]oxazin]-5'-amine

HRID 455723Notes

Reaction equation

HRID 455723 reaction equation
[F:1][C:2]1[C:7](B(O)O)=[CH:6][CH:5]=[CH:4][N:3]=1.[Br:11][C:12]1[CH:13]=[C:14]2[C@@:25]3([N:30]=[C:29]([NH2:31])[CH2:28][O:27][CH2:26]3)[C:24]3[C:19](=[CH:20][CH:21]=[C:22](I)[CH:23]=3)[O:18][C:15]2=[N:16][CH:17]=1.C(=O)([O-])[O-].[K+].[K+].O1CCOCC1>C1C=CC(P(C2C=CC=CC=2)[C-]2C=CC=C2)=CC=1.C1C=CC(P(C2C=CC=CC=2)[C-]2C=CC=C2)=CC=1.Cl[Pd]Cl.[Fe+2].C(Cl)Cl.O>[Br:11][C:12]1[CH:13]=[C:14]2[C@@:25]3([N:30]=[C:29]([NH2:31])[CH2:28][O:27][CH2:26]3)[C:24]3[C:19](=[CH:20][CH:21]=[C:22]([C:7]4[C:2]([F:1])=[N:3][CH:4]=[CH:5][CH:6]=4)[CH:23]=3)[O:18][C:15]2=[N:16][CH:17]=1

Participants

7

Reactant 4

HCID 11430Potassium CarbonateHCID 312751,4-DioxaneHCID 27832702-Fluoropyridine-3-boronic acidHCID 58465904(S)-3-bromo-7-iodo-2',6'-dihydrospiro[chromeno[2,3-b]pyridine-5,3'-[1,4]oxazin]-5'-amine

Product 1

HCID 67436956(S)-3-bromo-7-(2-fluoropyridin-3-yl)-2',6'-dihydrospiro[chromeno[2,3-b]pyridine-5,3'-[1,4]oxazin]-5'-amineYield 72.1%

Reagents, catalysts & solvents 2

HCID 178418807HCID 178418807, compoundCatalystHCID 962WaterSolvent

Conditions

Temperature
80 °C

Procedure

A vial was charged with 2-fluoropyridin-3-ylboronic acid (0.094 g, 0.667 mmol), PdCl2(dppf)-CH2Cl2-adduct (0.026 g, 0.032 mmol), (S)-3-bromo-7-iodo-2′,6′-dihydrospiro[chromeno[2,3-b]pyridine-5,3′-[1,4]oxazin]-5′-amine (0.300 g, 0.635 mmol), and potassium carbonate (0.351 g, 2.54 mmol). Dioxane (3.5 mL) and water (1.5 mL) were added. The vial was flushed with argon, sealed and heated to 80° C. for 1 hour. The reaction mixture was then diluted with EtOAc, dried over MgSO4 and concentrated. Purification of the crude residue by column chromatography [0-80% (90:10:1 DCM/MeOH/NH4OH)/DCM] gave (S)-3-bromo-7-(2-fluoropyridin-3-yl)-2′,6′-dihydrospiro[chromeno[2,3-b]pyridine-5,3′-[1,4]oxazin]-5′-amine (0.202 g, 0.458 mmol)

Workup

  1. customThe vial was flushed with argon
  2. customsealed
  3. additionThe reaction mixture was then diluted with EtOAc
  4. dry with materialdried over MgSO4
  5. concentrationconcentrated
  6. customPurification of the crude residue by column chromatography [0-80% (90:10:1 DCM/MeOH/NH4OH)/DCM]

Sources & evidence

ORD record
ord-3f5d7004fddb48b0b48aa2a28dc8aaf0
Source dataset
uspto-grants-2013_07
Patent number
US08497264B2

Reaction notes

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