Acetic Acid → 1H-Indazole

HRID 1414751Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 1414751
[N:1]([C:4]1[C:9]([CH:10]=O)=[CH:8][C:7](OC)=[C:6](OC)[CH:5]=1)=[N+:2]=[N-].NC1C=CC=CC=1.C(O)(=O)C>CN(C)C=O>[NH:1]1[C:4]2[C:9](=[CH:8][CH:7]=[CH:6][CH:5]=2)[CH:10]=[N:2]1

Komponenten

5

Edukt 3

HCID 176Acetic AcidHCID 6115AnilineHCID 11344785Benzaldehyde, 2-azido-4,5-dimethoxy-

Produkt 1

HCID 92211H-IndazoleAusbeute 169,3 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 6228DimethylformamideLösungsmittel

Versuchsvorschrift

A solution containing 51.8 g (0.25 mole) 6-azidoveratraldehyde (Example XII). 26.0 g (0.28 mole) aniline, 4 ml galcial acetic acid, and 300 ml dimethylformamide was stirred at 90°-100° for 1 hr, then refluxed for 1 hr until the gaseous evolution was complete. After the mixture was cooled and poured slowly in 1.5 l. iced water, the product was filtered, washed with two 150 ml portions cold water, and air dried to give 50 g of crude indazole, m.p. 130°-138°. Recrystallization from ethyl acetate--hexane followed by ethyl acetate gave 26 g (41%) of the product, m.p. 149°-152°. Recrystallization from ethyl acetate--hexane gave the analytical sample, m.p. 149°-152°.

Aufarbeitung

  1. temperaturerefluxed for 1 hr until the gaseous evolution
  2. temperatureAfter the mixture was cooled
  3. additionpoured slowly in 1.5 l
  4. filtrationiced water, the product was filtered
  5. washwashed with two 150 ml portions cold water, and air
  6. customdried

Quellen und Nachweise

ORD-Eintrag
ord-d78d9a25f43f47ad8247b5119df22454
Quelldatensatz
uspto-grants-1977_01
Patentnummer
US04002652

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