تفاعل #155424

معادلة التفاعل

4-morpholinecarbonyl chloride

3-fluoro-4-hydroxybenzaldehyde

CH2Cl2

pyridine

→

2-fluoro-4-formylphenyl morpholine-4-carboxylate

المردود 87.0%

المذيبات

Water

ظروف التفاعل

المعالجة

1. 1
   أخرىTo a 250 mL dry round bottom flask
2. 2
   workup.STIRRINGThe mixture was stirred
3. 3
   أخرىat room temperature
4. 4
   أخرىovernight
5. 5
   أخرىThe CH2Cl2 layer was separated
6. 6
   استخلاصthe aqueous layer was extracted continually with CH2Cl2 (50 mL×3)
7. 7
   تجفيفThe combined CH2Cl2 solution was dried over Na2SO4
8. 8
   أخرىAfter removal of the solvent
9. 9
   أخرىthe residue was purified with a silica gel chromatography (heptane/ethyl acetate, gradient eluting)

الإجراء التجريبي

To a 250 mL dry round bottom flask were added 3-fluoro-4-hydroxybenzaldehyde (4.76 g, 34.0 mmol), anhydrous CH2Cl2 (40 mL) and pyridine (3.6 mL, 44.2 mmol). The mixture was stirred in an ice-water bath, then 4-morpholinecarbonyl chloride (4.4 mL, 37.4 mmol) was added. The mixture was stirred and warmed slowly to room temperature, then at room temperature overnight. Water (80 mL) was added to the reaction mixture. The CH2Cl2 layer was separated, and the aqueous layer was extracted continually with CH2Cl2 (50 mL×3). The combined CH2Cl2 solution was dried over Na2SO4. After removal of the solvent, the residue was purified with a silica gel chromatography (heptane/ethyl acetate, gradient eluting) to give 2-fluoro-4-formylphenyl morpholine-4-carboxylate (7.45 g) as white solid. Yield: 87%. 1H NMR (CDCl3, 300 MHz): δ=9.97 (s, 1H), 7.74-7.70 (m, 2H), 7.45 (t, J=7.8 Hz, 1H), 3.81-3.61 (m, 8H). 13C NMR (CDCl3, 75.5 MHz, mixture of two isomers): δ=189.9, 156.5, 153.1, 151.8, 144.0, 143.8, 135.0, 134.9, 126.7, 126.6, 124.8, 116.7, 116.4, 66.4, 66.3, 45.2, 44.4.

المصدر