反応 #47966

反応方程式

dimethyl sulfide

4-allyl-5,6-difluoro-4-(4-fluorophenyl)-3-(2,2,2-trifluoroethyl)-3,4-dihydroquinazolin-2(1H)-one

ozone

→

[5,6-Difluoro-4-(4-fluorophenyl)-2-oxo-3-(2,2,2-trifluoroethyl)-1,2,3,4-tetrahydroquinazolin-4-yl]acetaldehyde

溶媒

EtOAc

MeOH

反応条件

後処理

1. 1
   その他the ozone was removed
2. 2
   洗浄washed three times with water and brine
3. 3
   乾燥The organic layer was dried over NaSO4
4. 4
   ろ過filtered
5. 5
   濃縮concentrated in vacuo

実験手順

To a −78° C. solution of 2.6 g (6.495 mmol) 4-allyl-5,6-difluoro-4-(4-fluorophenyl)-3-(2,2,2-trifluoroethyl)-3,4-dihydroquinazolin-2(1H)-one in 25 ml MeOH was bubbled ozone. After 15 mins at −78° C., the ozone was removed and the reaction mixture was quenched with 4.8 mL (64.946 mmol) dimethyl sulfide. After stirring at room temperature overnight, the reaction mixture was diluted with EtOAc and washed three times with water and brine. The organic layer was dried over NaSO4, filtered and concentrated in vacuo. Afforded [5,6-difluoro-4-(4-fluorophenyl)-2-oxo-3-(2,2,2-trifluoroethyl)-1,2,3,4-tetrahydroquinazolin-4-yl]acetaldehyde. 1H NMR (CDCl3, 400 MHz) δ 9.79 (s, 1H, O═CH); 8.61 (br s, 1H, ArNHC═O); 7.38-7.27 (m, 2H, ArH); 7.15-7.03 (m, 3H, ArH); 6.57-6.53 (m, 1H, ArH); 4.08 (m, 1H, C); 3.72 (dd, 1H, J=17.4 Hz, CH2C═O); 3.50 (dd, 1H J=1.28 Hz, 17.58 Hz, CH2C═O); 3.32 (m, 1H, CH2C═O). ES MS+1=403.1.

出典