Tandem Gold Self‐Relay Catalysis for the Synthesis of 2,3‐Dihydropyridin‐4(1
<i>H</i>
)‐ones: Combination of σ and π Lewis Acid Properties of Gold Salts
作者:Santos Fustero、Javier Miró、María Sánchez‐Roselló、Carlos del Pozo
DOI:10.1002/chem.201403340
日期:2014.10.20
nucleophilic addition followed by a Petasis–Ferrier rearrangement. This tandem protocol, catalyzed by the same gold salt under the same reaction conditions, gave rise to the efficient synthesis of 2,3‐dihydropyridin‐4‐(1 H)‐ones, which contain a cyclic quaternary α‐amino acid unit. The asymmetric version was performed by generating the starting materials from the corresponding sulfinylimines.
金盐具有π和σLewis酸的双重功能已在串联自继催化中得到了利用。因此,三氟甲磺酸三苯基膦金(I)介导高炔丙基酰胺的酰胺官能团的分子内羰基加成至三键。金盐与中间体恶嗪的σ络合物的形成促进了亲核性加成,然后发生了Petasis-Ferrier重排。在相同的反应条件下,由相同的金盐催化的串联方案导致了2,3-二氢吡啶-4-(1 H)-one的有效合成 ,其中含有环状季铵α-氨基酸单元。通过从相应的亚磺酰亚胺生成原料来进行不对称形式。