A Dual Arylboronic Acid–Aminothiourea Catalytic System for the Asymmetric Intramolecular Hetero-Michael Reaction of α,β-Unsaturated Carboxylic Acids
作者:Takumi Azuma、Akihiro Murata、Yusuke Kobayashi、Tsubasa Inokuma、Yoshiji Takemoto
DOI:10.1021/ol501954r
日期:2014.8.15
facilitate for the first time the intramolecular aza- and oxa-Michael reactions of α,β-unsaturated carboxylic acids. The combination of an arylboronic acid with a chiral aminothiourea allowed for these reactions to proceed successfully in an enantioselective manner to afford the desired heterocycles in high yields and ee’s (up to 96% ee). The overall utility of this dual catalytic system was demonstrated by
双官能氨基硼酸已被首次用于促进α,β-不饱和羧酸的分子内氮杂和氧杂-迈克尔反应。芳基硼酸与手性氨基硫脲的结合使这些反应以对映选择性的方式成功进行,从而以高收率和ee(高达96%ee)提供所需的杂环。该双催化体系的整体效用通过(+)-赤藓糖酰胺B的一锅对映选择性合成得到证明,该合成通过顺序的迈克尔和酰胺化反应进行。