Improved Syntheses of Both Enantiomers of 1,2,5,6-Diepoxyhexane from (2<i>S</i>,5<i>S</i>)-1,2,5,6-Hexanetetrol
作者:Nobuo Machinaga、Chihiro Kibayashi
DOI:10.1055/s-1992-26286
日期:——
Several methods for the preparation of (2R,5R) and (2S,5S) -1,2,5,6-diepoxyhexane (2) from 3,4-dideoxy-D-threo-hexitol [(2S,5S) -1,2,5,6-hexanetetrol (1)] as a single common chiral synthon are described. Among these methods, the methods via (2S,5S)-1, 6-bis(pivaloyloxy)-2,5-hexanediol and (2S,5S)-2,5-bis(benzoyloxy)-1, 6-dibromohexane, both derived from 1, provide the best results in terms of the selectivity, yield, and optical purity for the preparation of (R,R)-2 and (S,S)-2, respectively.
本文描述了几种从3,4-二脱氧-D-苏式己糖醇((2S,5S)-1,2,5,6-己烷四醇(1))制备(2R,5R)和(2S,5S)-1,2,5,6-二环氧己烷(2)的方法,这些方法都使用单一的通用手性合成单元。在这些方法中,通过(2S,5S)-1,6-双(特戊酰氧基)-2,5-己二醇和(2S,5S)-2,5-双(苯甲酰氧基)-1,6-二溴己烷的方法,从1出发,在制备(R,R)-2和(S,S)-2时,分别具有最佳的选择性、产率和光学纯度。