Michael Addition of 2,2-Difluoroketene Silyl Acetal. Preparation of 4,4-Difluoroglutamic Acid and 5,5-Difluorolysine
作者:Osamu Kitagawa、Akihiro Hashimoto、Yoshiro Kobayashi、Takeo Taguchi
DOI:10.1246/cl.1990.1307
日期:1990.8
2,2-Difluoroketene silyl acetal, generated in situ by treating methyl difluoroiodoacetate with Zn followed by chlorosilane, readily reacted with α,β-unsaturated carbonyl compounds or acetals to give the 1,4-addition products, preferentially. The difluoro analogs of glutamic acid and lysine were prepared through the present reaction.
2,2-二氟乙烯酮硅缩醛,通过将甲基二氟碘乙酸酯与锌反应,然后与氯硅烷反应生成,可以优先与α,β-不饱和羰基化合物或缩醛反应,生成1,4-加成产物。通过本反应合成了谷氨酸和赖氨酸的二氟类似物。