An efficient and practical method was developed for the synthesis of tetrahydro-1H-pyrrolo[1,2-a]imidazol-2-ones based on the decarboxylative cyclization reaction of α-ketoamides and proline. In most cases, tetrahydro-1H-pyrrolo[1,2-a]imidazol-2-ones were obtained with perfect diastereoselectivity to give trans-isomer in excellent yield.
基于α-酮酰胺与脯氨酸的脱羧环化反应,开发了一种高效,实用的四氢-1 H-吡咯并[1,2 - a ]咪唑-2-酮的合成方法。在大多数情况下,以完美的非对映选择性获得四氢-1 H-吡咯并[1,2- a ]咪唑-2-酮,从而以优异的收率得到反式异构体。
Catalyst- and Additive-Free Chemoselective Transfer Hydrogenation of α-Keto Amides to α-Hydroxy Amides by Sodium Formate
A catalyst‐ and additive‐free chemoselective transfer hydrogenation of α‐keto amides to α‐hydroxy amides is easily achieved by using sodium formate as a hydrogen source. Control experiments suggest that the NH group of α‐keto amides is crucial for the chemoselective reduction through the formation of hydrogen bonds.
Synthesis of 1,2-Fused Bicyclic Imidazolidin-4-ones by Redox-Neutral Cyclization Reaction of Cyclic Amines and α-Ketoamides
作者:Jiashou Wu、Yi Liu、Zhengneng Jin、Huajiang Jiang
DOI:10.1055/s-0036-1591951
日期:2018.5
A redox annulation reaction of cyclic amines and α-ketoamides was developed. A variety of 1,2-fused bicyclic imidazolidin-4-ones were synthesized in moderate to good yields from cyclic amines by redox-neutral α-C–H functionalization.