作者:Hiromichi Fujioka、Yasushi Nagatomi、Naoyuki Kotoku、Hidetoshi Kitagawa、Yasuyuki Kita
DOI:10.1016/s0040-4020(00)00859-0
日期:2000.12
desymmetrization of saturated and unsaturated cyclic and acyclic meso-1,2-diols has been developed from the ene acetals, prepared from the norbornene carboxyaldehyde and meso-1,2-diols. The intramolecular haloetherification of the ene acetals as a key step afforded 8-membered acetals in a stereoselective manner just by the reaction of norbornene olefin even when the ene acetals from unsaturated meso-1,2-diols having
已经从由降冰片烯羧醛和内消旋-1,2-二醇制备的烯缩醛开发了饱和和不饱和的环状和非环状的内消旋-1,2-二醇的不对称脱对称。烯缩醛的分子内卤代醚化是关键步骤,即使使用降冰片烯烯烃的反应,即使使用来自同一分子中具有烯烃的不饱和内消旋-1,2-二醇的烯缩醛,烯键缩合物的立体选择性也能以立体选择的方式提供8元缩醛。随后的还原消除,随后保护羟基和反缩醛化,以良好的收率得到了光学活性的1,2-二醇衍生物和起始的烯缩醛。