反应详情

To a solution of methyl α-[4-cyclopropylmethoxycarbonylthio-3-phthalimido-2-oxoazetidin-1-yl]-α-(2-bromo-1-cyclopropylmethoxycarbonyloxyethylidene)-acetate (500 mg) in methylene chloride (20 ml) is added aluminum chloride (510 mg) at once, and the mixture is stirred at room temperature. After 1 hour, the mixture is poured into cold 3% hydrochloric acid (20 ml), and extracted with methylene chloride. The extract solution is washed with water, dried over magnesium sulfate, and evaporated to give methyl α-[4-mercapto-3-phthalimido-2-oxoazetidin-1-yl]-α-(2-bromo-1-hydroxyethylidene)-acetate (252 mg). Yield: 72.5%. IR: νmaxCHCl3 1790, 1783, 1728, 1670, 1620 cm-1. NMR: δCDCl3 1.80d(11 Hz)1H, 3.87s3H, 4.22+4.56AB2(10 Hz)2H, 5.38dd (11; 5 Hz)1H, 5.70d(5 Hz)1H, 7.76m4H, 12.3s1H.

1. extractionextracted with methylene chloride
2. washThe extract solution is washed with water
3. dry with materialdried over magnesium sulfate
4. customevaporated