تفاعل #600362

معادلة التفاعل

CsF

Ethyl 2-bromothiazole-4-carboxylate

4-(trifluoromethoxy)phenylboronic acid

→

ethyl 2-[4-(trifluoromethoxy)phenyl]-1,3-thiazole-4-carboxylate

المردود 53.0%

المذيبات

1,4-dioxane

ظروف التفاعل

المعالجة

1. 1
   أخرىcap vial
2. 2
   أخرىN2 was bubbled through the mixture for 10 seconds
3. 3
   أخرىThe vial was capped
4. 4
   درجة الحرارةAfter 6 hr the mixture was cooled to RT
5. 5
   workup.ADDITIONdiluted with EtOAc
6. 6
   ترشيحfiltered through a pad of Celite
7. 7
   غسيلwashing with EtOAc
8. 8
   تركيزconcentrated

الإجراء التجريبي

Ethyl 2-bromothiazole-4-carboxylate (100 mg, 0.424 mmole), 4-(trifluoromethoxy)phenylboronic acid (113 mg, 0.551 mmole), CsF (129 mg, 0.847 mmole), and bis(tri-t-butylphosphine)palladium(0) (22 mg, 0.043 mmole) were combined in a screw cap vial. To this was added 1,4-dioxane (2 mL). N2 was bubbled through the mixture for 10 seconds. The vial was capped then heated to 100° C. After 6 hr the mixture was cooled to RT, diluted with EtOAc, filtered through a pad of Celite washing with EtOAc, and concentrated. Flash column chromatography (Biotage-SNAP-25 g SiO2, 0-15% EtOAc/hexanes) gave ethyl 2-[4-(trifluoromethoxy)phenyl]-1,3-thiazole-4-carboxylate (71 mg, 53%) as a pale orange solid. 1H NMR (399 MHz, CDCl3): δ 8.18 (s, 1 H); 8.07-8.03 (m, 2 H); 7.30 (d, J=8.4 Hz, 2 H); 4.46 (q, J=7.1 Hz, 2 H); 1.44 (t, J=7.1 Hz, 3 H).

المصدر