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

HRID 1472376Notes

Reaction equation

HRID 1472376 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 674369573-Bromo-7-(2-fluoropyridin-3-yl)-2',6'-dihydrospiro[chromeno[2,3-b]pyridine-5,3'-[1,4]oxazin]-5'-amineYield 132%

Reagents, catalysts & solvents 2

HCID 178418807HCID 178418807, compoundCatalystHCID 962WaterSolvent

Conditions

Temperature
80 °C

Procedure

A vial charged with 2-fluoropyridin-3-ylboronic acid (0.078 g, 0.556 mmol), PdCl2(dppf)-CH2Cl2 (0.022 g, 0.026 mmol), (S)-3-bromo-7-iodo-2′,6′-dihydrospiro[chromeno[2,3-b]pyridine-5,3′-[1,4]oxazin]-5′-amine, and potassium carbonate (0.293 g, 2.118 mmol) was treated with 2.5 mL dioxane and 1 mL water. The vial was then flushed with argon, sealed and heated to 80° C. for 1 hr. The reaction mixture was diluted with EtOAc, dried over MgSO4 and concentrated under reduced pressure to yield 3-bromo-7-(2-fluoropyridin-3-yl)-2′,6′-dihydrospiro[chromeno[2,3-b]pyridine-5,3′-[1,4]oxazin]-5′-amine (0.309 g, 0.700 mmol, 132% yield). This material was used without further purification. Step 2: A vial charged with Pd(PPh3)4 (0.079 g, 0.068 mmol), copper(I) iodide (0.013 g, 0.068 mmol), 18-crown-6 (0.045 g, 0.170 mmol), potassium fluoride (0.118 g, 2.040 mmol), trimethyl((3-methyloxetan-3-yl)ethynyl)silane (0.229 g, 1.360 mmol), and 3-bromo-7-(2-fluoropyridin-3-yl)-2′,6′-dihydrospiro[chromeno[2,3-b]pyridine-5,3′-[1,4]oxazin]-5′-amine (0.300 g, 0.680 mmol) was treated with 3 mL DMF, sealed under argon, and heated to 110° C. overnight. The reaction mixture was then poured onto water (10 mL) and extracted with EtOAc (3×10 mL). The combined organic layers were dried over MgSO4 and concentrated under reduced pressure. Purification of the crude residue by column chromatography [0-50% (9:1 DCM/MeOH)/DCM] gave (S)-7-(2-fluoropyridin-3-yl)-3-((3-methyloxetan-3-yl)ethynyl)-2′,6′-dihydrospiro[chromeno[2,3-b]pyridine-5,3′-[1,4]oxazin]-5′-amine (0.079 g, 0.094 mmol, 25.46% yield).

Workup

  1. customThe vial was then flushed with argon
  2. customsealed
  3. additionThe reaction mixture was diluted with EtOAc
  4. dry with materialdried over MgSO4
  5. concentrationconcentrated under reduced pressure

Sources & evidence

ORD record
ord-19260119b2cc483bb265829a1ae29eab
Source dataset
uspto-grants-2015_04
Patent number
US09012446B2

Reaction notes

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