δ-Keto Aminoacrylonitriles and δ-Keto Aminoenones from 1-Pyrrolines, Cyanoacetylenes, and Acetylenic Ketones
作者:Boris A. Trofimov、Ludmila A. Oparina、Anastasiya G. Mal’kina、Nikita A. Kolyvanov、Igor A. Ushakov、Ivan V. Saliy、Konstantin A. Apartsin
DOI:10.1055/a-1742-2736
日期:2022.6
The ring-opening/functionalization of 1-pyrrolines by cyanoacetylenes or acetylenicketones (20–80 °C, MeCN, H2O) affords δ-keto aminoacrylonitriles and δ-keto aminoenones, mostly as the Z-isomers, in up to 85% yields. The synthesis involves C(2)–N bond cleavage in the intermediate hemiaminal resulting from the intermediate 1,3(4)-dipolar 1-pyrroline/acetylene complexes and water.