Simple and efficient methods for selective preparation of α-mono or α,α-dichloro ketones and β-ketoesters by using DCDMH
作者:Zizhan Chen、Bin Zhou、Huihua Cai、Wei Zhu、Xinzhuo Zou
DOI:10.1039/b815169e
日期:——
New processes that can selectively prepare α-mono or α,α-dichloro ketones and β-ketoesters using 1,3-dichloro-5,5-dimethylhydantoin (DCDMH) are reported. Using silica gel as the catalyst and methanol as the solvent and heating for 1 h under reflux, α-monochlorinated products were selectively obtained in 86–98% yield. However using a deep eutectic solvent (choline chloride: p-TsOH = 1:1) as the solvent
可以选择性地制备α-单或α,α-二氯的新工艺 酮类 和β-酮酸酯使用 1,3-二氯-5,5-二甲基乙内酰脲(DCDMH)。使用硅石 凝胶为 催化剂 和 甲醇 作为 溶剂回流加热1小时,有选择地获得α-一氯代产物,收率86-98%。但是使用深共晶溶剂 (氯化胆碱:p -TsOH = 1:1)作为溶剂 室温下搅拌45分钟,可以选择性地获得α,α-二氯化产物,产率为86-95%。