Synthesis 2019; 51(07): 1669-1679
DOI: 10.1055/s-0037-1610676
paper
© Georg Thieme Verlag Stuttgart · New York

Lewis Acid Catalyzed Regio- and Diastereoselective Synthesis of Spiroisoxazolines via One-Pot Sequential Knoevenagel Condensation/1,3-Dipolar Cycloaddition Reaction

Hossein Yazdani
,
Ayoob Bazgir*
Department of Chemistry, Shahid Beheshti University G.C., Tehran 1983963113, Iran   eMail: a_bazgir@sbu.ac.ir
› Institutsangaben

We gratefully acknowledge the financial support from the Research Council of Shahid Beheshti University and the Iran National Science Foundation (INSF) (Project Number 96011205).
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Publikationsverlauf

Received: 31. Oktober 2018

Accepted after revision: 08. November 2018

Publikationsdatum:
09. Januar 2019 (online)


Abstract

A ZnCl2-catalyzed regio- and diastereoselective one-pot sequential Knoevenagel condensation/1,3-dipolar cycloaddition reaction of CH acids (oxindole, 1,3-indandione, and 3H-pyrazol-3-one), aldehydes, and dibromoformaldoxime has been established. The method allows the synthesis of diversely functionalized spiroisoxazolines in good isolated yields under mild reaction conditions. Moreover, the preparation of spiroindene-isoxazole-1,3-diones containing benzoimidazole or benzothiazole moieties as new ligands for the metal-catalyzed coupling reactions and C–H activation is demonstrated.

Supporting Information