作者:Jörg Pietruszka、Niklas Schöne、Wolfgang Frey、Li Grundl
DOI:10.1002/chem.200800034
日期:2008.6.9
Allylboronates are highly attractive reagents for allyl additions. Enantiomerically pure, stable reagents with a stereogenic centre in alpha-position to boron are especially versatile, albeit often difficult to synthesize. Starting from boron-containing allyl alcohols 6 and 7, which are discussed in detail herein, a set of reagents were obtained via [3,3]-sigmatropic rearrangements and consecutive
烯丙基硼酸酯是用于烯丙基加成的极具吸引力的试剂。对映体纯净,稳定的试剂,在硼的α位上具有立体异构中心,尽管通常难以合成,但它的用途特别广泛。从本文详细讨论的含硼烯丙醇6和7开始,通过[3,3]σ重排和侧链中的连续转化获得了一组试剂。可以首先通过化学相关性建立构型,也可以通过X射线晶体学建立构型(16、18、34和39)。进行烯丙基加成导致形成具有高对映体过量的主要为(Z)构型的均烯丙基醇(31、43-45)。对试剂15/16(和ent-15 / ent-16,