(2<i>R</i>,3<i>R</i>)-1,4-Dimethoxy-1,1,4,4-tetraphenyl-2,3-butanediol: Chiral Auxiliary and Efficient Protecting Group for Boronic Acids
作者:Joachim E. A. Luithle、Jörg Pietruszka
DOI:10.1021/jo0056601
日期:2000.12.1
an efficient chiral auxiliary in the cyclopropanation of alkenylboronic esters. The stability of the obtained cyclopropylboronic esters allowed the chromatographic separation of the diastereoisomers. Furthermore, it enabled a variety of transformations in the side-chain, including oxidation, reduction, and reactions under acidic, basic, or radical conditions, that finally led to boron containing functionalized
(2R,3R)-1,4-二甲氧基-1,1,4,4-四苯基-2,3-丁二醇(1)已被用作烯基硼酸酯的环丙烷化中的有效手性助剂。所获得的环丙基硼酸酯的稳定性允许非对映异构体的色谱分离。此外,它能够在侧链上进行多种转化,包括氧化,还原以及在酸性,碱性或自由基条件下的反应,最终导致含硼的官能化双环丙烷(例如12和18)的形成。 X射线晶体学(化合物10)和化学相关性建立了结构单元。Matteson的同源性导致了低聚环丙烷FR-900848的已知高级中间体。