Chiral Preparation of (<i>R</i>)- and (<i>S</i>)-3-(Benzyloxy)-4,4-dimethyl-1-pentene
作者:Masayuki Ito、Chihiro Kibayashi
DOI:10.1055/s-1993-25817
日期:——
Facile routes for the preparation of an optically active allylic ether bearing the tert-butyl group at an allylic chiral center, i.e. 2-(benzyloxy)-3,3-dimethyl-1-pentene, in both (R)- and (S)-enantiomeric forms, which are expected to be promising, efficient dipolarophiles in highly stereoselective asymmetric nitrone cycloaddition, have been developed, utilizing commercially available L-tert-leucine and (R)-pantolactone, respectively, as chiral precursors.
简便制备具有光学活性的烯丙基醚的方法已经开发出来,这种烯丙基醚在烯丙基手性中心带有叔丁基,即(R)和(S)两种对映形式的2-(苄氧基)-3,3-二甲基-1-戊烯。这些化合物预计将成为高效且高度立体选择性的极性亲二体,在不对称硝酮环加成反应中表现优异。该方法利用了商业上可获得的L-叔亮氨酸和(R)-泛醇酸内酯分别作为手性前体。