Double Nucleophilic Addition to Acrolein with Ketene Silyl Acetals and Allylborolanes Catalyzed by Proline
作者:Makoto Shimizu、Mami Kawanishi、Akinori Itoh、Isao Mizota、Iwao Hachiya
DOI:10.1246/cl.2011.862
日期:2011.8.5
In the presence of a catalytic amount of proline and silica gel, a mixture of ketene silyl acetals and 2-allyl-4,4,5,5-tetramethyl-1,3,2-dioxaborolane underwent 1,4- and subsequently 1,2-addition with acrolein to give δ-hydroxyesters in good yields in a highly diastereoselective manner.
在催化量的脯氨酸和硅胶存在下,酮烯硅基醛与2-烯丙基-4,4,5,5-四甲基-1,3,2-二氧硼烷的混合物与丙烯醛发生1,4-加成,随后进行1,2-加成,生成δ-羟基酯,反应具有良好的产率和高度的非对映选择性。