Desymmetrization of 1,4-Pentadien-3-ol by the Asymmetric 1,3-Dipolar Cycloaddition of Azomethine Imines
作者:Mari Yoshida、Naotaro Sassa、Tomomitsu Kato、Shuhei Fujinami、Takahiro Soeta、Katsuhiko Inomata、Yutaka Ukaji
DOI:10.1002/chem.201302889
日期:2014.2.10
Desymmetrization of the divinyl carbinol 1,4‐pentadien‐3‐ol was accomplished by the asymmetric 1,3‐dipolar cycloaddition of azomethine imines based on a magnesium‐mediated, multinucleating chiral reaction system utilizing diisopropyl (R,R)‐tartrate as the chiral auxiliary. The corresponding optically active trans‐pyrazolidines, each with three contiguous stereogenic centers, were obtained with excellent
二乙烯基甲醇1,4-戊二烯-3-醇的不对称化是通过基于镁介导的多核手性反应体系,以酒石酸二异丙酯(R,R)作为偶氮亚胺亚胺的不对称1,3-偶极环加成反应完成的。手性助剂。相应的光学活性反式吡唑烷,每个具有三个连续的立体生成中心,具有极好的区域,非对映和对映选择性,结果高达ee达99% 。已证明该反应适用于芳基和烷基取代的甲亚胺亚胺。使用催化量的二异丙基(R,R酒石酸盐在加入MgBr 2时也有效。