反应详情

温度

85 °C

The 3,4-difluoronitrobenzene (2.09 mL, 18.857 mmol) was dissolved in dry CH3CN (50 mL) and then treated dropwise with N,N-diisopropylethyl amine (8.212 mL, 47.143 mmol). The resultant yellow mixture was next treated with thiomorpholine (4.74 mL, 47.143 mmol). The reaction was heated to roflux (85° C.) for 16 hours and then it was allowed to cool to ambient temperature over 3 hours, stirring under N2. At this point, the reaction was determined to be complete by TLC (15% EtOAc/hexane, UV short wave). The reaction mixture was first concentrated under reduced prossure and then adsorbed onto silica gel (50 g). The material was chromatographed on more silica gel (175 g, packed with hexane), eluting with 1 L each of 5%, 10% and 15% EtOAc/hexane to give 4.6 g (100%) of the title compound as an orange, crystalline solid with a melting point of 59.5°-60.5° C. and a HRMS (M+) calculated for C10H11N2O2FS 242.0522, found 242.0525.

1. temperatureto cool to ambient temperature over 3 hours
2. concentrationThe reaction mixture was first concentrated under reduced prossure
3. customThe material was chromatographed on more silica gel (175 g, packed with hexane)
4. washeluting with 1 L each of 5%, 10% and 15% EtOAc/hexane