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

HRID 1970273Notes

Reaction equation

HRID 1970273 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[CH:22]=[N:23][CH:24]=[CH:25][CH:26]=4)[CH:13]=3)[O:8][C:5]2=[N:6][CH:7]=1.C(N[CH:31]([CH3:33])[CH3:32])(C)C.[CH3:34]N(C=O)C.[C:39](OCC)(=O)[CH3:40]>O.[Cu](I)I.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>[CH3:34][C:31]([CH3:32])([CH3:33])[C:39]#[C:40][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[CH:22]=[N:23][CH:24]=[CH:25][CH:26]=4)[CH:13]=3)[O:8][C:5]2=[N:6][CH:7]=1

Participants

8

Reactant 4

HCID 6228DimethylformamideHCID 7912DiisopropylamineHCID 8857Ethyl AcetateHCID 67241561(5S)-3-bromo-7-(3-pyridinyl)spiro[chromeno[2,3-b]pyridine-5,4'-[1,3]oxazol]-2'-amine

Product 1

HCID 45256651(S)-3-(3,3-dimethylbut-1-ynyl)-7-(pyridin-3-yl)-5'H-spiro[chromeno[2,3-b]pyridine-5,4'-oxazol]-2'-amineYield 64.5%

Reagents, catalysts & solvents 3

HCID 83717Copper iodideCatalystHCID 178418397HCID 178418397, compoundCatalystHCID 962WaterSolvent

Conditions

Temperature
90 °C

Procedure

(5S)-3-Bromo-7-(3-pyridinyl)spiro[chromeno[2,3-b]pyridine-5,4′-[1,3]oxazol]-2′-amine (170 mg, 0.415 mmol), diisopropyl amine (2911 μL, 20.77 mmol), copper iodide (15.82 mg, 0.083 mmol), tetrakis(triphenylphosphine)palladium (48.0 mg, 0.042 mmol) and DMF (2769 μL, 0.415 mmol) were combined in a sealable tube, which was then flushed with argon and heated at 90° C. for 5 hours. After cooling to room temperature the reaction in the tube was diluted with water (25 mL) and poured into a separatory funnel containing ethyl acetate (25 mL). The layers were separated and the aqueous layer was extracted with ethyl acetate (4×50 mL). The combined organic layers were washed with brine, dried over sodium sulfate, filtered and concentrated in vacuo to provide a brown oil that was purified by silica gel chromatography (Redi-Sep pre-packed silica gel column (40 g), 0-10% methanol in methylenechloride with 0.1% ammonium hydroxide) to provide (5S)-3-(3,3-dimethyl-1-butyn-1-yl)-7-(3-pyridinyl)spiro[chromeno[2,3-b]pyridine-5,4′-[1,3]oxazol]-2′-amine (110 mg, 0.268 mmol, 64.5% yield) as a brown foam. MS m/z=411.2 [M+H]+. Calc'd for C25H23N4O3: 411.2.

Workup

  1. customwhich was then flushed with argon
  2. temperatureAfter cooling to room temperature
  3. customthe reaction in the tube
  4. additionpoured into a separatory funnel
  5. customThe layers were separated
  6. extractionthe aqueous layer was extracted with ethyl acetate (4×50 mL)
  7. washThe combined organic layers were washed with brine
  8. dry with materialdried over sodium sulfate
  9. filtrationfiltered
  10. concentrationconcentrated in vacuo
  11. customto provide a brown oil that
  12. customwas purified by silica gel chromatography (Redi-Sep pre-packed silica gel column (40 g), 0-10% methanol in methylenechloride with 0.1% ammonium hydroxide)

Sources & evidence

ORD record
ord-0aadadf440224bf79351a23121428277
Source dataset
uspto-grants-2013_04
Patent number
US08426447B2

Reaction notes

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