Turkish Journal of Chemistry
DOI
-
Abstract
The manganese(III) acetate mediated radical cyclization of dimedone 1a, 2,4-pentanedione 1b, ethyl acetoacetate 1c, 1,3-cyclohexanedione 1d and 5-phenyl-1,3-cyclohexanedione 1e with 1,1-diphenyl-1-butene 2a afforded 4,5-dihydrofurans (3c, 3e) and tetrahydrobenzofurans (3a, 3g, 3h) in good yields (55% - 77%). Additionally, the reactions of trifluoromethyl-group containing 1,3-dicarbonyls, 4,4,4-trifluoro-1-phenylbutane-1,3-dione 1f and 4,4,4-trifluoro-1-thien-2ylbutane-1,3-dione 1g with 2a 3-trifluoroacetyl-4,5-dihydrofurans gave in 74% and 78% yields, respectively. Treatment of 1a, 1b and 1c with 1,2-diphenyl-1-pentene 2a resulted in the formation of tetrahydrobenzofuran 3b and 4,5-dihydrofurans 3d and 3f in lower yields.
Keywords
Manganese(III) acetate, free radical cyclization, 1, 3-dicarbonyl, 4, 5-dihydrofuran, tetrahydrobenzofuran, trifluoroacetyl, oxidative addition
First Page
579
Last Page
587
Recommended Citation
YILMAZ, MEHMET; BİÇER, EMRE; and PEKEL, A. TARIK (2005) "Manganese(III) Acetate Mediated Free Radical Cyclization of 1,3-Dicarbonyl Compounds with Sterically Hindered Olefins," Turkish Journal of Chemistry: Vol. 29: No. 6, Article 1. Available at: https://journals.tubitak.gov.tr/chem/vol29/iss6/1
