Reaktion #929565

Reaktionsgleichung

5-nitroanthranilic acid

pyridine

oxalyl chloride

benzoxazinone

4-t-butylbenzoyl chloride

→

solid

Ausbeute 93.6%

6-Nitro-2-(4-t-butylphenyl)-4H-3,1-benzoxazin-4-one

Ausbeute 93.6%

Lösungsmittel

DMF

methylene chloride

DMF

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturthe reaction mixture was heated to 80° C. for 4 h
2. 2
   TemperaturThe reaction mixture was cooled
3. 3
   FiltrationFiltration
4. 4
   Trocknenhexane washes, and vacuum drying (150° C./13 Pa/2 h)
5. 5
   Sonstigeafforded a light brown solid
6. 6
   EinengenThe mixture was concentrated to a volume of about 125 mL (cold) in vacuo
7. 7
   Filtrationfiltered

Vorschrift

To a mixture of 5-nitroanthranilic acid (24.59 g, 135 mmol) and pyridine (14.19 mL, 175.5 mmol, 1.3 eq) in DMF (140 mL) at 0° C., under N2, was added 4-t-butylbenzoyl chloride (31.64 mL, 162 mmol, 1.2 eq) over 15 min. After warming to room temperature, the reaction mixture was heated to 80° C. for 4 h. The reaction mixture was cooled and poured into 700 mL ice-water and stirred to break up the solid material. Filtration, with water followed with 1:2 Et2O:hexane washes, and vacuum drying (150° C./13 Pa/2 h) afforded a light brown solid as a mixture of acid and benzoxazinone (37.1 g, 80%). The solid was suspended in DMF (0.4 mL, 5.4 mmol, 0.05 eq) and methylene chloride (200 mL), under N2, and oxalyl chloride (10.4 mL, 119.2 mmol, 1.1 eq) was added dropwise. Vigorous gas evolution was observed. The solid went into solution over 2 h. The mixture was concentrated to a volume of about 125 mL (cold) in vacuo and filtered to give a light tan solid (about 10 g). A second crop was about 85% pure (about 10 g). The mother liquor was evaporated to dryness and vacuum dried (80° C./13 Pa/3 h) to afford a light brown solid product, 95% pure (about 12 g).

Quelle