Base‐catalyzed [3 + 2]/[4 + 2]‐annulations of cyclic <scp><i>N</i></scp>‐sulfimines with γ‐ and δ‐sulfonamido/hydroxy‐α,β‐unsaturated carbonyls: Stereoselective synthesis of imidazolidines, oxazolidines, hexahydropyrimidines, and 1,3‐oxazinanes
作者:Yoseop Kim、Seung Yeon Kim、Sung‐Gon Kim
DOI:10.1002/bkcs.12702
日期:2023.7
β-unsaturated carbonyl compounds, catalyzed by Et3N, has been successfully applied for the synthesis of stereoselective hexahydropyrimidines. Furthermore, the base-catalyzed annulation of cyclic N-sulfimines with γ- and δ-hydroxy-α,β-unsaturated carbonyl compounds has proven to be a reliable method for the synthesis of oxazolines and 1,3-oxazinanes.
建立了一种通过环状N-亚磺胺的[3+2]环化制备咪唑烷衍生物的高效、简单的合成方法。该反应涉及环状N-亚磺胺与γ-磺酰胺基-α,β-不饱和羰基化合物的反应,Cs 2 CO 3为催化剂。结果是产生了多种具有显着产率和立体选择性的咪唑烷衍生物。此外,在Et 3催化下,环状N-亚磺胺与δ-磺酰胺基-α,β-不饱和羰基化合物之间发生[4 + 2]-成环反应。N,已成功应用于立体选择性六氢嘧啶的合成。此外,环状N-亚磺胺与γ-和δ-羟基-α,β-不饱和羰基化合物的碱催化成环已被证明是合成恶唑啉和1,3-恶嗪烷的可靠方法。