تفاعل #87614

معادلة التفاعل

DMF

ethyl 2-chloro-6-fluorobenzoate

LDA

→

pure product

المردود 35.1%

ethyl 6-chloro-2-fluoro-3-formylbenzoate

المردود 35.1%

المذيبات

THF

ظروف التفاعل

المعالجة

1. 1
   workup.STIRRINGThe reaction mixture was further stirred for 2 h at same temperature
2. 2
   أخرىThe reaction mass was quenched in dilute HCl
3. 3
   استخلاصextracted with ethyl acetate
4. 4
   تركيزconcentrated
5. 5
   أخرىto afford crude product which
6. 6
   أخرىwas further purified by column chromatography
7. 7
   غسيلeluting with EtOAC

الإجراء التجريبي

To a cold solution of ethyl 2-chloro-6-fluorobenzoate (0.500 g, 24.7 mmol) in THF (35 mL) was added LDA (6.6 g, 61.8 mmol) at −78° C. The reaction mixture was stirred for 2 h at same temperature, followed by addition of DMF (2.7 g, 37 mmol). The reaction mixture was further stirred for 2 h at same temperature. The reaction mass was quenched in dilute HCl, extracted with ethyl acetate and concentrated to afford crude product which was further purified by column chromatography eluting with EtOAC: pet. ether to afford 2.00 g of pure product. 1H NMR (300 MHz, DMSO d6): δ 1.31 (t, 3H), 4.42 (q, 2H), 7.94-7.99 (m, 2H), 10.14 (s, 1H).

المصدر