Radical Cyclization Reactions via Manganese(III) Acetate Leading to 2-Thienyl-Substituted Dihydrofuran Compounds
作者:Emre Biçer、Mehmet Yılmaz、Melih Karataş、Ahmet Tarık Pekel
DOI:10.1002/hlca.201100397
日期:2012.5
The 2‐thienyl‐substituted 4,5‐dihydrofuran derivatives 3–8 were obtained by the radical cyclization reaction of 1,3‐dicarbonyl compounds 1a–1f with 2‐thienyl‐substituted conjugated alkenes 2a–2e by using [Mn(OAc)3] (Tables 1–5). In this study, reactions of 1,3‐dicarbonyl compounds 1a–1e with alkenes 2a–2c gave 4,5‐dihydrofuran derivatives 3–5 in high yields (Tables 1–3). Also the cyclic alkenes 2d
所述2-噻吩基-取代的4,5-二氢呋喃衍生物3 - 8是由1,3-二羰基化合物的基团的环化反应而得到的1A - 1F与2-噻吩基-取代的共轭烯烃2A - 2E通过使用[锰(OAC)3 ](表1 - 5)。在这项研究中,1,3-二羰基的反应的化合物1A - 1E与烯烃2A - 2C,得到4,5-二氢呋喃衍生物3 - 5以高产率(表1 - 3)。也是环状烯烃2D和2E,得到二氢苯并呋喃化合物,即,6和7以良好的收率(表4)。有趣的是,由于生成了两种稳定的碳正离子中间体,苯甲酰丙酮(= 1-苯基丁烷-1,3-二酮; 1f)与一些烯烃的反应产生了两种产物(表5)。