An organocatalytic kinetic resolution of racemic secondary nitroallylic alcohols via Michael/acetalization sequence to give fully substituted tetrahydropyranols is described. The process affords the products with high to excellent stereoselectivities. The highly enantioenriched, less reactive (S)-nitroallylic alcohols were isolated with good to high chemical yields. The synthetic application of the resolved substrate is shown toward the synthesis of enantioenriched (+)-(2S,3R)-3-amino-2-hydroxy-4-phenylbutyric acid.
                            本文介绍了一种通过Michael/
缩醛化序列的有机催化动力学拆分手性二级硝基
烯丙醇,制备全取代的
四氢吡喃醇的方法。该过程具有高到极好的立体选择性。高对映选择性、反应性较差的(S)-硝基
烯丙醇以良好到高的
化学收率分离出来。本文还展示了解决的底物在合成对映富集的(+)-(2S,3R)-
3-氨基-2-羟基-4-苯基丁酸方面的应用。