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。