反应详情

Freshly prepared 2,2,2-trichloroethyl 2-methyloxocarbapen-2-em-3-carboxylate, made from 100 mg. (0.317 mmole) of the precursor oxide according to Example 11, was taken up in 2 ml. of methylene chloride and cooled to -78° C. Tetramethylammonium borohydride (23 mg., 0.079 mmole) was added. After 30 minutes, ir spectral analysis (1775 cm-1) indicated a satisfactory reduction. The reaction was quenched with acetic acid (0.58 equivalent, 10 microl.), extracted twice with aqueous buffer solution (pH 7), dried over anhydrous magnesium sulfate and filtered to yield a solution of 2,2,2-trichloroethyl 1-hydroxy-2-methylcarbapen-2-em-3-carboxylate. If desired, this product is further isolated by evaporation to dryness in vacuo at reduced temperature.

1. extractionextracted twice with aqueous buffer solution (pH 7)
2. dry with materialdried over anhydrous magnesium sulfate
3. filtrationfiltered