Palladium‐Catalyzed Defluorinative Alkylation of
<i>gem</i>
‐Difluorocyclopropanes: Switching Regioselectivity via Simple Hydrazones
作者:Leiyang Lv、Chao‐Jun Li
DOI:10.1002/anie.202102240
日期:2021.6
can completely switch the reaction selectivity to give the alkylated α-fluoroalkene skeletons (branched selectivity). The unique reactivity of hydrazones that enables analogous inner-sphere 3,3′-reductive elimination driven by denitrogenation, as well as the assistance of steric-embedded N-heterocyclic carbene ligand, are the key to switch the regioselectivity. A wide range of hydrazones derived from
宝石-二氟环丙烷与亲核试剂在钯催化下的开环交叉偶联的常规方法主要是提供β-氟烯烃骨架(线性选择性)。在本文中,我们报告了一种可以完全切换反应选择性以生成烷基化α-氟代烯烃骨架(支链选择性)的合作策略。具有独特的反应活性,能够通过脱氮作用实现类似的内球3,3'-还原消除,以及空间嵌入的N-杂环卡宾配体的辅助作用,是切换区域选择性的关键。从天然丰富的芳基和烷基醛衍生而来的各种均非常适用,并且各种宝石-二氟环丙烷,包括修饰的药物和生物分子,可以在温和的条件下用高价值的烷基化α-氟化烯烃基序有效地官能化。