Radical Cyclization of Fluorinated 1,3-Dicarbonyl Compounds with Dienes Using Manganese(III) Acetate and Synthesis of Fluoroacylated 4,5-Dihydrofurans
作者:Mehmet Yılmaz、E. Vildan Burgaz Yılmaz、A. Tarık Pekel
DOI:10.1002/hlca.201100105
日期:2011.11
Radical cyclizations of fluorinated 1,3‐dicarbonyl compounds with dienes mediated by Mn(OAc)3 afforded 4,5‐dihydrofurans containing difluoroacetyl, trifluoroacetyl, or heptafluorobutanoyl groups in good‐to‐excellent yields. Additionally, 2‐(difluoromethyl)‐4,5‐dihydrofurans and a 4,7‐dihydrooxepin derivative were obtained as unexpected products in the reaction of 4,4‐difluoro‐1‐phenylbutane‐1,3‐dione
Mn(OAc)3介导的含二烯的氟化1,3-二羰基化合物的自由基环化以优异的产率得到了含有二氟乙酰基,三氟乙酰基或七氟丁酰基的4,5-二氢呋喃。此外,在4,4-二氟-1-苯基丁烷-1,3-二酮与1,3-二烯的反应中,以意外产物形式获得了2-(二氟甲基)-4,5-二氢呋喃和4,7-二氢氧杂庚烯衍生物。二苯基丁1,3-二烯。对称二烯(例如2,3-二甲基丁1,3-二烯和1,4-二苯基丁-1,3-二烯与1,3-二酮)的自由基环化提供了相应的低收率产品。但是,用1,3-二羰基化合物处理1-苯基丁-1,3-二烯可得到含氟酰基的4,5-二氢呋喃。用3-甲基-1-苯基丁a-1,3-二烯和1,3-二苯基丁-1,3-二烯进行的自由基环化反应产生了4,5-二氢呋喃,收率很高,