反应详情

Add a freshly prepared 1.93M solution of (1R,2R)-2-methyl-cyclopropanecarbonyl chloride (5.52; mol) in dichloromethane over 15; min to a suspension of 1-(5-amino-3-bromo-isothiazol-4-yl)-ethanone (1.17; kg, 4.93; mol) and triethylamine (859; mL, 6.16; mol) in dichloromethane (5.86; L) at room temperature and stir 4; hours. Quench the reaction with water (1; L) and separate the layers. Dry the organic layer over magnesium sulfate, filter, concentrate and purify the residue by short column silica gel chromatography (3500; g of SiO2) gradient eluting from 100:0; to 40:60 using n-hexane and ethyl acetate to give the title compound as a white solid (1230; g, 82%). MS (m/z): 303, 305; (M+1).

1. customQuench
2. customthe reaction with water (1; L)
3. customseparate the layers
4. dry with materialDry the organic layer over magnesium sulfate
5. filtrationfilter
6. concentrationconcentrate
7. custompurify the residue by short column silica gel chromatography (3500; g of SiO2) gradient
8. washeluting from 100:0