Rhodium‐Catalyzed Asymmetric Allylation of Malononitriles as Masked Acyl Cyanide with Allenes: Efficient Access to β,γ‐Unsaturated Carbonyls
作者:Christian P. Grugel、Bernhard Breit
DOI:10.1002/chem.201804150
日期:2018.10.12
A rhodium‐catalyzed regio‐ and enantioselective intermolecular allylation of malononitriles as masked acyl cyanides (MAC) with terminal and symmetrical internal allenes is reported. A RhI/Josiphos catalytic system combined with subsequent oxidative degradation of the primary adducts enables a straightforward access to α‐branched, β,γ‐unsaturated carbonyl compounds. The present protocol exhibits perfect
报道了铑催化的丙二腈的区域和对映选择性分子间烯丙基化反应,即带有末端和对称内部烯基的掩蔽酰基氰化物(MAC)。Rh I / Josiphos催化体系与随后的一级加合物的氧化降解相结合,可以直接获得α支化,β,γ-不饱和羰基化合物。本方案在烯丙基化步骤中展现出完美的原子经济性,并且具有良好的官能团相容性。此外,使用α-取代的丙二腈可以构建全碳四元中心。