作者:Katsukiyo Miura、Tatsuyuki Takahashi、Hisashi Nishikori、Akira Hosomi
DOI:10.1246/cl.2001.958
日期:2001.10
In the presence of a catalytic amount of TsOH·H2O, hemiacetals derived from (Z)-4-trialkylsilyl-3-buten-1-ols and chloral were cyclized to 2-trichloromethyl-4-trialkylsilylmethyl-1,3-dioxanes in good to high yields. The substrates bearing an allylic substituent achieved high levels of 1,2-asymmetric induction. When the silyl group was a benzyldimethylsilyl group, the products could be efficiently converted to 1,2,4-triol derivatives by oxidative cleavage of the silicon–carbon bond.
在一定量的 TsOH-H2O 催化下,(Z)-4-三烷基硅基-3-丁烯-1-醇和氯醛衍生的半乙酸酯被环化为 2-三氯甲基-4-三烷基硅甲基-1,3-二氧杂环戊烷,收率从好到高。带有烯丙基取代基的底物实现了高水平的 1,2-不对称诱导。当硅烷基为苄基二甲基硅烷基时,产物可通过硅碳键的氧化裂解有效地转化为 1,2,4-三醇衍生物。