Combined Transition-Metal- and Organocatalysis: An Atom Economic C3 Homologation of Alkenes to Carbonyl and Carboxylic Compounds
作者:Susanne T. Kemme、Tomáš Šmejkal、Bernhard Breit
DOI:10.1002/chem.200903223
日期:2010.3.15
A combination of regioselective room‐temperature/ambient‐pressure hydroformylation (transition‐metal catalysis) and decarboxylative Knoevenagel reactions (organocatalysis) allowed for the development of an efficient, one‐pot C3 homologation of terminal alkenes to (E)‐α,β‐unsaturated acids and esters, (E)‐β,γ‐unsaturated acids, (E)‐α‐cyano acrylic acids, and α,β‐unsaturated nitriles. All reactions proceed
区域选择性的室温/环境压力加氢甲酰化(过渡金属催化)和脱羧Knoevenagel反应(有机催化)的结合可以发展出末端烯烃到(E)-α,β-的高效一锅C3同源性。不饱和酸和酯,(E)-β,γ-不饱和酸,(E)-α-氰基丙烯酸和α,β-不饱和腈。所有反应均在温和条件下进行,可耐受各种官能团,并以良好的收率和出色的区域和立体控制效果提供不饱和羰基化合物。此外,(E的迭代C2同源性)-α,β-不饱和羧酸可以通过使用超分子催化剂进行脱羧加氢甲酰化,然后与有机催化剂进行脱羧Knoevenagel缩合反应来实现。