Dimethylformamide → (4S)-3'-(3,3-dimethylbut-1-ynyl)-7'-(2-fluoro-3-pyridinyl)spiro[5H-1,3-oxazole-4,5'-chromeno[2,3-b]pyridine]-2-amine

HRID 335812Notes

Reaction equation

HRID 335812 reaction equation
Br[C:2]1[CH:3]=[C:4]2[C@:15]3([CH2:19][O:18][C:17]([NH2:20])=[N:16]3)[C:14]3[C:9](=[CH:10][CH:11]=[C:12]([C:21]4[C:22]([F:27])=[N:23][CH:24]=[CH:25][CH:26]=4)[CH:13]=3)[O:8][C:5]2=[N:6][CH:7]=1.C1COCC1.CN(C=O)C.[CH3:38][C:39]([CH3:43])([CH3:42])[C:40]#[CH:41]>C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1.[Cu]I.CCOC(C)=O.O>[CH3:38][C:39]([CH3:43])([CH3:42])[C:40]#[C:41][C:2]1[CH:3]=[C:4]2[C@:15]3([CH2:19][O:18][C:17]([NH2:20])=[N:16]3)[C:14]3[C:9](=[CH:10][CH:11]=[C:12]([C:21]4[C:22]([F:27])=[N:23][CH:24]=[CH:25][CH:26]=4)[CH:13]=3)[O:8][C:5]2=[N:6][CH:7]=1

Participants

9

Reactant 4

HCID 6228DimethylformamideHCID 8028TetrahydrofuranHCID 135123,3-Dimethyl-1-butyneHCID 67239951(S)-3-bromo-7-(2-fluoropyridin-3-yl)-5'H-spiro[chromeno[2,3-b]pyridine-5,4'-oxazol]-2'-amine

Product 1

HCID 45256826(4S)-3'-(3,3-dimethylbut-1-ynyl)-7'-(2-fluoro-3-pyridinyl)spiro[5H-1,3-oxazole-4,5'-chromeno[2,3-b]pyridine]-2-amine

Reagents, catalysts & solvents 4

HCID 24350Copper(1+) iodide; Copper(I) iodide; Cuprous iodide; Cuprous iodide (CuI)CatalystHCID 178418397HCID 178418397, compoundCatalystHCID 962WaterSolventHCID 8857Ethyl AcetateSolvent

Conditions

Temperature
110 °C

Procedure

Combined (S)-3-bromo-7-(2-fluoropyridin-3-yl)-5′H-spiro[chromeno[2,3-b]pyridine-5,4′-oxazol]-2′-amine (80 mg, 0.187 mmol), tetrakis(triphenylphosphine)palladium (21.64 mg, 0.019 mmol), copper(i) iodide (3.57 mg, 0.019 mmol) and THF (749 μL, 0.187 mmol) and DMF (749 μL, 0.187 mmol) in a reaction tube. Added DIPA (525 μL, 3.75 mmol) then 3,3-dimethylbut-1-yne (115 μL, 0.936 mmol) and flushed the reaction tube with argon. Sealed and heated at 110° C. for 3 hours. The mixture was partioned between water (10 mL) and EtOAc (10 mL). The layers were separated, and the aqueous layer was extracted with EtOAc (2×10 mL). The combined organic extracts were dried over sodium sulfate, filtered, and evaporated. The residue was purified by chromatography on a 25-g SNAP column, eluting with 0-70% of a 90:10:1 mixture of DCM/MeOH/NH4OH in DCM. The derived residue was then purified by reverse-phase HPLC (10-90% CH3CN/H2O with 0.1% TFA) to give (S)-3-(3,3-dimethylbut-1-ynyl)-7-(2-fluoropyridin-3-yl)-5′H-spiro[chromeno[2,3-b]pyridine-5,4′-oxazol]-2′-amine as a white powder after evaporation from DCM/hexane. Found MS: MH+=429.

Workup

  1. customSealed
  2. customThe layers were separated
  3. extractionthe aqueous layer was extracted with EtOAc (2×10 mL)
  4. dry with materialThe combined organic extracts were dried over sodium sulfate
  5. filtrationfiltered
  6. customevaporated
  7. customThe residue was purified by chromatography on a 25-g SNAP column
  8. washeluting with 0-70% of a 90:10:1 mixture of DCM/MeOH/NH4OH in DCM
  9. customThe derived residue was then purified by reverse-phase HPLC (10-90% CH3CN/H2O with 0.1% TFA)

Sources & evidence

ORD record
ord-52979f853c1d47a2a6e7e048f29aa459
Source dataset
uspto-grants-2014_11
Patent number
US08883782B2

Reaction notes

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