Carbon Dioxide → 5-((tert-Butoxycarbonyl)amino)-2-fluoroisonicotinic acid

HRID 276851노트

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HRID 276851 반응식
[F:1][C:2]1[N:7]=[CH:6][C:5]([NH:8][C:9](=[O:15])[O:10][C:11]([CH3:14])([CH3:13])[CH3:12])=[CH:4][CH:3]=1.[C:16](=[O:18])=[O:17]>CN(C)CCN(C)C.CCOCC>[C:11]([O:10][C:9]([NH:8][C:5]1[C:4]([C:16]([OH:18])=[O:17])=[CH:3][C:2]([F:1])=[N:7][CH:6]=1)=[O:15])([CH3:12])([CH3:14])[CH3:13]

참가 물질

5

반응물 2

HCID 280Carbon DioxideHCID 11031143tert-Butyl (6-fluoropyridin-3-yl)carbamate

생성물 1

HCID 106110655-((tert-Butoxycarbonyl)amino)-2-fluoroisonicotinic acid

시약·촉매·용매 2

HCID 3283Diethyl Ether용매HCID 8037N,N,N',N'-Tetramethylethylenediamine용매

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온도
-15 °C

실험 절차

To 30 g of (6-fluoro-pyridin-3-yl)-carbamic acid, tert-butyl ester in 60 mL of tetramethylethylenediamine and 750 mL of ether at −78° C. under an inert atmosphere was added slowly 180 mL of 2.5 M n-butyllithium/hexanes (3 eq). After the addition was complete, the reaction was allowed to warm to −15° C. for 5 minutes then recooled to −78° C. Dry ice was allowed to sublime in a separate flask and the vapor was passed over the rapidly stirred reaction mixture while the cooling bath was removed and the reaction allowed to warm to 0° C. Sufficient water was added to dissolve the precipitated product and the resultant aqueous phase was washed twice with ether before acidifying with concentrated HCl. The precipitate was filtered, washed with water, and dried in vacuo to give 21.2 g of 5-tert-butoxycarbonylamino-2-fluoro-isonicotinic acid, which was used as is for the next step: melting point 240-245° C. (decomposed); mass spectrum (negative mode, m/e): M−H 255.2.

후처리

  1. additionAfter the addition
  2. customthen recooled to −78° C
  3. customto sublime in a separate flask
  4. customthe vapor was passed over the rapidly stirred reaction mixture while the cooling bath
  5. customwas removed
  6. temperatureto warm to 0° C
  7. additionSufficient water was added
  8. dissolutionto dissolve the precipitated product
  9. washthe resultant aqueous phase was washed twice with ether
  10. filtrationThe precipitate was filtered
  11. washwashed with water
  12. customdried in vacuo

출처 및 근거

ORD 기록
ord-02f729fcc37d491cb748640a7b9cae0f
출처 데이터셋
uspto-grants-2002_03
특허 번호
US06355636B1

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