Journal
COMPTES RENDUS CHIMIE
Volume 15, Issue 5, Pages 409-413Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.crci.2012.02.004
Keywords
1,3-Dipolar Cycloaddition; Pyrazolines; Regiochemistry; Ultrasound; Cyclopropanes
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The regispecific synthesis of pyrazolines has been accomplished through the 1,3-dipolar cycloaddition of 2-diazopropane to pyridazine-3,6-dione derivatives. A convenient and inexpensive ultrasound-assisted preparation of bicyclo-cyclopropanes in a completely stereoselective manner in almost quantitative yields has been realized. The highly stereoselective extrusion of nitrogen suggests a concerted mechanism. (C) 2012 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.
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