The C-2 side-chain substitution reaction of a sulfoxide and a sulfone derived from a p-nitrobenzyl (1R, 5S, 6S)-6-[(1R)-1-(tert-butyldimethylsilyloxy)ethyl]-2-[2-(diethylcarbamoyl)phenylthio]-1-methylcarbapen-2-em-3-carboxylate with various mercaptans progressed smoothly in the presence of magnesium bromide. Bromomagnesium thiolate prepared from mercaptans proved to be especially effective for the substitution reaction and gave precursors of 1β-methylcarbapenem antibiotics in high yield.
                                    由对硝基苄基 (1R,5S,6S)-6-[(1R)-1-(叔丁基二甲基
硅氧基)乙基]-2-[2-(
二乙基氨基甲酰基)苯
硫基]-1-甲基碳青霉烯-2-em-3-
甲酸酯衍生的亚砜和砜与各种
硫醇的 C-2 侧链取代反应在
溴化镁存在下进展顺利。由
硫醇制备的
硫酸溴镁被证明对取代反应特别有效,并能以高产率得到 1β- 甲基碳青霉烯类抗生素的前体。