反应详情

A solution of N-(2-(cyclopropylmethoxy)-4-mercaptophenyl)-methanesulfonamide (0.112 g, 0.410 mmol), (S)-3,5-dichloro-4-(2-(3-(cyclopropylmethoxy)-4-(difluoromethoxy)phenyl)-2-((4-nitrophenoxy)-carbonyloxy)ethyl)pyridine 1-oxide (prepared with an analogous procedure to that described in Scheme 3, Step 1) (0.200 g, 0.342 mmol), and DMAP (0.021 g, 0.171 mmol) in DCM (8 ml) was stirred at RT overnight. The mixture was diluted with DCM and washed several times with diluted aqueous K2CO3. The organic layer was dried over Na2SO4 and the solvent was removed. The crude was purified by filtration on silica gel cartridge (DCM:EtOAc=80:20) affording the desired compound as a pale yellow amorphous solid. The product was further purified by flash chromatography on silica gel cartridge (petroleum ether:EtOAc=50:50 to 35:65) and by preparative LC/MS affording (S)-3,5-dichloro-4-(2-(3-(cyclopropylmethoxy)-4-(difluoromethoxy)phenyl)-2-((3-(cyclopropylmethoxy)-4-(methylsulfonamido)phenylthio)carbonyloxy)ethyl)pyridine 1-oxide as an off-white amorphous solid (0.060 g, 0.083 mmol, 24.40% yield, MS/ESI+ 719.23 [MH]+, [αD]=−64.64, c=0.47 in DCM).

1. washwashed several times with diluted aqueous K2CO3
2. dry with materialThe organic layer was dried over Na2SO4
3. customthe solvent was removed
4. filtrationThe crude was purified by filtration on silica gel cartridge (DCM:EtOAc=80:20)