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Access and modulation of substituted 1-methyl-1,6-dihydropyrazolo[3,4-c]pyrazoles†
Marie-Aude Hiebel,Adriana-Luminiţa Fînaru,Hassan Allouchi,Gérald Guillaumet,Franck Suzenet
RSC Advances Pub Date : 03/05/2021 00:00:00 , DOI:10.1039/D1RA00314C
Abstract

Despite the pharmacological potential of the pyrazolo[3,4-c]pyrazoles, only a few methods of preparation and direct functionalization of this moiety have been described. We report herein a convenient design of new pyrazolo[3,4-c]pyrazoles with a high therapeutic impact. The effective chosen strategy consists of hydrazine condensations and C–N Ullmann-type cross-coupling reactions with microwave activation. Moreover, chemoselective bromination of the newly formed bipyrazoles followed by Suzuki–Miyaura cross-coupling reactions allowed the synthesis of a variety of modulated heterobicycles.

Graphical abstract: Access and modulation of substituted 1-methyl-1,6-dihydropyrazolo[3,4-c]pyrazoles
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