Reaktion #40288

Reaktionsgleichung

3-hydroxy-1,2,3-benzotriazin-4(3H)-one

Pentynoic acid

dicyclohexylcarbodiimide

3-Hydroxy-1,2,3-benzotriazin-4(3H)-one

→

Pent-4-ynoic Acid 4-oxo-4H-benzo[d][1,2,3]triazin-3-yl Ester

Lösungsmittel

THF

THF

Reaktionsbedingungen

Aufarbeitung

1. 1
   TemperaturThe solution was cooled in a brine-icewater bath
2. 2
   Sonstige2 h
3. 3
   Sonstigeat room temperature
4. 4
   FiltrationPrecipitated salts were filtered off
5. 5
   EinengenThe filtrate was concentrated in vacuo
6. 6
   Sonstigecrystallized from hexane (4 mL)
7. 7
   FiltrationThe crystals were filtered off
8. 8
   Sonstigedried

Vorschrift

Pentynoic acid (200 mg, 2.04 mmol) was dissolved in THF (4 mL). The solution was cooled in a brine-icewater bath. A solution of dicyclohexylcarbodiimide (421 mg, 2.04 mmol) in THF (2 mL) was added. 3-Hydroxy-1,2,3-benzotriazin-4(3H)-one (333 mg, 2.04 mmol) was added after 5 minutes. The reaction mixture was stirred 1 h at −10° C. and then 2 h at room temperature. TLC indicated full conversion of 3-hydroxy-1,2,3-benzotriazin-4(3H)-one (eluent: ethyl acetate). Precipitated salts were filtered off. The filtrate was concentrated in vacuo and crystallized from hexane (4 mL). The crystals were filtered off and dried. Yield: 450 mg, 93%. RF=0.8 (ethyl acetate).

Quelle