تفاعل #10847

معادلة التفاعل

phenoxide

cesium carbonate

2-hydroxy-4-methoxy-5-thiophen-2-yl-benzaldehyde

2-bromo-6-methylpyridine

1-naphthoic acid

cesium carbonate

→

4-methoxy-2-(6-methyl-pyridin-2-yloxy)-5-thiophen-2-yl-benzaldehyde

المردود 65.9%

المذيبات

sodium hydroxide

ethyl acetate

toluene

toluene

ethyl acetate

ظروف التفاعل

المعالجة

1. 1
   workup.ADDITIONwas added
2. 2
   workup.STIRRINGstirred for 30 min
3. 3
   أخرىThe layers were separated
4. 4
   استخلاصthe aqueous layer was extracted with ethyl acetate (5×20 mL)
5. 5
   غسيلThe combined organic extracts were washed with a 50% brine solution (1×25 mL), brine (1×25 mL)
6. 6
   تجفيفdried over sodium sulfate
7. 7
   تركيزconcentrated to an dark brown semi-solid

الإجراء التجريبي

Ex-122A: To a solution of 2-hydroxy-4-methoxy-5-thiophen-2-yl-benzaldehyde (0.68 g, 2.9 mmol) and 2-bromo-6-methylpyridine (0.25 g, 1.4 mmol) in toluene (1.0 mL) was added ethyl acetate (0.0063 g, 0.072 mmol, 1-naphthoic acid (0.50 g, 2.9 mmol), 5 Å molecular sieves (0.36 g), cesium carbonate (0.94 g, 2.9 mmol), and copper(I) triflate-benzene complex (0.020 g, 0.036 mmol). The phenoxide crashed out of solution upon addition of cesium carbonate and additional toluene (1 mL) was added to facilitate stirring. The heterogeneous solution was immediately heated to 110° C. and aged for 24 h. Upon completion, as determined by HPLC, the reaction was diluted with a 5% sodium hydroxide solution (10 mL) and ethyl acetate (10 mL) and stirred for 30 min. The layers were separated and the aqueous layer was extracted with ethyl acetate (5×20 mL). The combined organic extracts were washed with a 50% brine solution (1×25 mL), brine (1×25 mL), dried over sodium sulfate and concentrated to an dark brown semi-solid. Silica gel chromatography (ethyl acetate/hexanes, 1:4) afforded 0.30 g (65%) of 4-methoxy-2-(6-methyl-pyridin-2-yloxy)-5-thiophen-2-yl-benzaldehyde as a light orange solid, mp 140–141° C. 1H-NMR (300 MHz, CDCl3) δ 10.21 (s, 1H), 8.23 (s, 1H), 7.64 (dd, 1H, J=7.8, 7.2 Hz), 7.52 (d, 1H, J=3.3 Hz), 7.35 (d, 1H, J=5.1 Hz), 7.10 (dd, 1H, J=5.1, 3.3 Hz), 6.94 (d, 1H, J=7.2 Hz), 6.78 (d, 1H, J=7.8 Hz), 6.75 (s, 1H), 3.92 (s, 3H), 2.44 (s, 3H). HRMS (EI) Calcd. for C18H15NO3S: 325.0773. Found: 325.0775. Anal. Calcd. C18H15NO3S: C, 66.44; H, 4.65; N, 4.30; S, 9.85. Found: C, 60.00; H, 4.58; N, 4.05; S, 9.84.

المصدر