Ultrasound-Assisted Metal-Mediated Method for the Formation of Tetrahydro-3,3′-Disubstituted Biscoumarins

Autor:	Ana I. Koleva, Nevena I. Petkova-Yankova, Rositca D. Nikolova
Jazyk:	angličtina
Rok vydání:	2018
Předmět:	coumarins biscoumarins organometallic reagents radical coupling homodimerization ultrasound irradiation aci-nitro tautomer Organic chemistry QD241-441
Zdroj:	Molecules, Vol 23, Iss 11, p 2810 (2018)
Druh dokumentu:	article
ISSN:	1420-3049
DOI:	10.3390/molecules23112810
Popis:	A new method for faster and simple preparation of 3,3′,4,4′-tetrahydro-3,3′-disubstituted-4,4′-biscoumarins with participation of an organozinc reagent is reported. The reaction is promoted by ultrasound irradiation and it offers a simple experimental setup and excellent reproducibility of the results. Moreover, homodimers were isolated in yields of 45⁻92%. The dimerization conditions are applicable to coumarins with electron-withdrawing groups at third position.
Databáze:	Directory of Open Access Journals
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