تفاعل #56771

معادلة التفاعل

TMSCl

NaI

N-[2-fluoro-6-(trifluoromethyl)benzyl]urea

Diketene

→

1c

المردود 81.6%

1-[2-fluoro-6-(trifluoromethyl)benzyl]-6-methylpyrimidine-2,4(1H,3H)-dione

المردود 81.6%

المذيبات

acetonitrile

water

ظروف التفاعل

المعالجة

1. 1
   درجة الحرارةThe resulting mixture was cooled in an ice-water bath
2. 2
   workup.STIRRINGstirred overnight
3. 3
   workup.STIRRINGAfter another 20 hours stirring
4. 4
   ترشيحthe precipitate was filtered via Buchnner funnel
5. 5
   غسيلthe yellow solid was washed with water and EtOAc

الإجراء التجريبي

NaI (43.9 g, 293 mmol) was added to N-[2-fluoro-6-(trifluoromethyl)benzyl]urea 1b (46.2 g, 19.6 mmol) in 365 mL of acetonitrile. The resulting mixture was cooled in an ice-water bath. Diketene (22.5 mL, 293 mmol) was added slowly via dropping funnel followed by addition of TMSCl (37.2 mL, 293 mmol) in the same manner. The resulting yellow suspension was allowed to warm to room temperature slowly and was stirred for 20 hours. LC-MS showed the disappearance of starting material. To the yellow mixture 525 mL of water was added and stirred overnight. After another 20 hours stirring, the precipitate was filtered via Buchnner funnel and the yellow solid was washed with water and EtOAc to give 1c as a white solid (48.5 g, 16 mmol). 1H NMR (CDCl3) δ 2.15 (s, 3H), 5.37 (s, 2H), 5.60 (s, 1H), 7.23-7.56 (m, 3H), 9.02 (s, 1H); MS (CI) m/z 303.0 (MH+).

المصدر