Synlett 2019; 30(15): 1782-1786
DOI: 10.1055/s-0039-1690189
letter
© Georg Thieme Verlag Stuttgart · New York

Synthesis of Tetrahydropyrazolo[4',3':5,6]pyrano[3,4-c]quinolones by Domino Knoevenagel/Hetero Diels–Alder Reactions

Mostafa Kiamehr
a   Department of Chemistry, Faculty of Science, University of Qom, Ghadir Blvd, P.O. Box 37146-6611, Qom, Iran   Email: m.kiamehr@qom.ac.ir
,
Leyla Mohammadkhani
a   Department of Chemistry, Faculty of Science, University of Qom, Ghadir Blvd, P.O. Box 37146-6611, Qom, Iran   Email: m.kiamehr@qom.ac.ir
,
Mohammad Reza Khodabakhshi
b   Applied Biotechnology Research Center, Baqiyatallah University of Medical Sciences, Mollasadra Street, P.O. Box 1435916471, Tehran, Iran
,
Behzad Jafari
c   Institut für Chemie, Universität Rostock, Albert-Einstein-Str. 3a, 18059 Rostock, Germany   Email: peter.langer@uni-rostock.de
,
Peter Langer
c   Institut für Chemie, Universität Rostock, Albert-Einstein-Str. 3a, 18059 Rostock, Germany   Email: peter.langer@uni-rostock.de
d   Leibniz-Institut für Katalyse e.V. an der Universität Rostock, A.-Einstein-Str. 29a, 18059 Rostock, Germany
› Author Affiliations
Further Information

Publication History

Received: 25 June 2019

Accepted after revision: 06 August 2019

Publication Date:
14 August 2019 (online)


Abstract

An efficient Lewis acid mediated domino Knoevenagel/hetero Diels–Alder (DKHDA) reaction of pyrazolone derivatives with N-acrylated anthranilic aldehydes was developed, which afforded functionalized tetracyclic tetrahydropyrazolo[4',3':5,6]pyrano[3,4-c]quinolones. The products were formed in good yields and with excellent regio- and stereoselectivity in favor of the cis-configured isomer.

Supporting Information