β-Functionalization of Carboxylic Anhydrides with β-Alkyl Substituents through Carbene Organocatalysis
作者:Zhichao Jin、Shaojin Chen、Yuhuang Wang、Pengcheng Zheng、Song Yang、Yonggui Robin Chi
DOI:10.1002/anie.201408604
日期:2014.12.1
The first NHC‐catalyzed functionalization of carboxylicanhydrides is described. In this reaction, the β carbon behaves as a nucleophilic carbon and undergoes asymmetric reactions with electrophiles. Anhydrides with challenging β‐alkyl substituents work effectively.
A novel protocol involving Huisgen zwitterions for the synthesis of bispyrazolines, and highly functionalized pyrazolines
作者:Jagadeesh Krishnan、Rony Rajan Paul
DOI:10.1016/j.tetlet.2022.154059
日期:2022.9
The present work illustrates a novel synthesis of bispyrazolines by triphenylphosphine-mediated reaction of cinnamils with dialkyl azodicarboxylates. Also, a synthesis of highly functionalized pyrazoline derivatives was accomplished by treating 2-alkenyl-1,3-diones with triphenylphosphine and azoesters.