(<i>E</i>)-α-Substituted γ-Alkoxyallylboronic Esters as New Reagents: Synthesis and Reactivity toward Aldehydes
作者:Françoise Possémé,、Michael Deligny、François Carreaux、Bertrand Carboni
DOI:10.1021/jo0622330
日期:2007.2.1
We have developed a synthesis of new allylboration reagents based on an allylic rearrangement. This approach led to the α-substituted γ-alkoxyallylboronates 2 with a high stereoselectivity in favor of the E-isomer, independent of the organometallic used. We have also studied the reactivity of these reagents toward aldehydes, showing that the allylboration reaction occurs with an excellent diastereoselectivity
我们已经开发了一种基于烯丙基重排的新的烯丙基硼化试剂的合成方法。这种方法导致具有高的立体选择性的α-取代的γ-烷氧基烯丙基硼酸酯2,有利于E-异构体,而与所用的有机金属无关。我们还研究了这些试剂对醛的反应性,表明发生烯丙基硼化反应的非对映选择性极好,从而得到抗二醇衍生物5。此外,该序列可以在“一锅法”过程中进行,从而避免了烯丙基硼酸酯的纯化。