I[C:2]1[C:7]([O:8][CH3:9])=[CH:6][CH:5]=[CH:4][C:3]=1[O:10][CH3:11].[Li]CCCC.[C:17]([S:21]([N:23]=[CH:24][C:25]([O:27][CH2:28][CH3:29])=[O:26])=[O:22])([CH3:20])([CH3:19])[CH3:18].[NH4+].[Cl-]>C1COCC1.CCOCC.O>[CH3:11][O:10][C:3]1[CH:4]=[CH:5][CH:6]=[C:7]([O:8][CH3:9])[C:2]=1[CH:24]([NH:23][S:21]([C:17]([CH3:18])([CH3:20])[CH3:19])=[O:22])[C:25]([O:27][CH2:28][CH3:29])=[O:26]A cooled (−78° C.) solution of 2-iodo-1,3-dimethoxybenzene (4.119 g; 15.13 mmol) in anh. THF (40 ml) was treated dropwise with a solution of 1.6 M n-BuLi in hexanes (10.40 ml; 16.64 mmol), and the resulting mixture was stirred at −78° C., under nitrogen, for 10 min. A solution of ethyl 2-((tert-butylsulfinyl)imino)acetate (3.106 g; 15.13 mmol) in anh. THF (20 ml) was added dropwise, and stirring at −78° C. was then continued for 25 min. The reaction mixture was treated with aq. sat. NH4Cl (30 ml), water (40 ml), and Et2O (60 ml). The separated aq. layer was extracted with Et2O (2×50 ml), and the mixed organic layers were washed with brine (40 ml), dried over anh. MgSO4, filtered, and concentrated to dryness under reduced pressure. Purification by FC (DCM/MeOH=20/1) afforded ethyl 2-(2,6-dimethoxyphenyl)-2-(1,1-dimethylethylsulfinamido)acetate as a yellow oil. LC-MS (conditions D): tR=0.91 min.; [M+H]+: 344.45 g/mol.
読み込み中…
