Реакция #417955

Уравнение реакции

2-amino-5-methylbenzoic acid

octyl chloroformate

→

desired product

Выход 25.0%

6-Methyl-2-octyloxy-4H-3,1-benzoxazin-4-one

Выход 25.0%

Растворители

pyridine

Условия реакции

Обработка

1. 1
   ДругоеThe pyridine was removed under vacuum
2. 2
   workup.DISSOLUTIONthe residue dissolved in ethyl acetate (50 ml)
3. 3
   ПромывкаThis solution was washed with 1M HCl (10 ml) and brine (5 ml)
4. 4
   Сушкаdried (MgSO4)
5. 5
   Другоеthe solvent removed in vacuo
6. 6
   Другоеto afford a pale orange oily solid
7. 7
   ДругоеRecrystallisation from hexane

Методика

A solution of 2-amino-5-methylbenzoic acid (302 mg, 2 mmol) in pyridine (10 ml) was cooled to 0° C. and treated dropwise with octyl chloroformate (1.15 ml, 6 mmol). The resulting mixture was allowed to warm to room temperature and stirred for 4 h. The pyridine was removed under vacuum and the residue dissolved in ethyl acetate (50 ml). This solution was washed with 1M HCl (10 ml) and brine (5 ml), dried (MgSO4) and the solvent removed in vacuo to afford a pale orange oily solid. Recrystallisation from hexane afforded the desired product as an off-white solid (144 mg, 25%); δH (400 MHz, DMSO-d6) 0.68 (3H, t, J 7, CH2CH3), 1.26-1.40 (10H, m, 5×CH2), 1.73 (2H, tt, J, J′7, OCH2CH2), 2.35 (3H, s, CH3), 4.35 (2H, t, J 7, OCH2), 7.34 (1H, d, J 8, Ph), 7.65 (1H, d, J 8, Ph), 7.83 (1H, s, Ph); m/z (ES+) 290 (MH+).

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