Enantioselective Addition of Ketene Silyl Acetals to Nitrones Catalyzed by Chiral Titanium Complexes. Synthesis of Optically Active <i>β</i>-Amino Acids
作者:Shun-Ichi Murahashi、Yasushi Imada、Toru Kawakami、Kazuhito Harada、Yoshiharu Yonemushi、Naomi Tomita
DOI:10.1021/ja0176649
日期:2002.3.1
A chiral titanium complex, Ti(O-i-Pr)(4)/BINOL/tert-butylcatechol, catalyzes enantioselective addition reaction of ketene silyl acetals to nitrones to give optically active beta-amino acid derivatives which are biologically active compounds and useful synthetic intermediates of natural products and pharmaceuticals such as beta-lactam antibiotics. The combined process of catalytic oxidation of secondary
一种手性钛络合物 Ti(Oi-Pr)(4)/BINOL/叔丁基儿茶酚,催化烯酮甲硅烷基缩醛与硝酮的对映选择性加成反应,得到具有光学活性的 β-氨基酸衍生物,这些衍生物是生物活性化合物和有用的合成中间体天然产物和药物,如 β-内酰胺类抗生素。仲胺的催化氧化和硝酮的对映选择性碳-碳键形成的组合过程,由此获得的乙烯酮甲硅烷基缩醛为合成光学活性 β-氨基酸衍生物和相关氮化合物提供了有用的两步法。