Synthesis of (2-Arylethylidene)cyclobutanes by Palladium-Catalyzed Reactions of Aryl Halides with Homoallyl Alcohols Bearing a Trimethylene Group at the Allylic Position
作者:Hideki Yorimitsu、Koichiro Oshima、Masayuki Iwasaki
DOI:10.1055/s-0029-1217703
日期:2009.8
Treatment of aryl bromides with homoallyl alcohols bearing a trimethylene group at the allylic position in the presence of cesium carbonate under palladium catalysis affords (2-arylethylidene)cyclobutanes selectively. The selective formation of the alkylidenecyclobutane skeleton results from regiospecific retro-allylation of the homoallyl alcohols, which accompanies the transposition of the double bonds.
在钯催化剂和碳酸铯存在下,芳基溴与带有三元环基的同烯丙基醇在烯丙位反应,可以选择性地得到(2-芳基乙叉基)环丁烷。这种选择性的烷叉环丁烷骨架的形成源于同烯丙基醇的区域选择性逆烯丙基化反应,该反应伴随着双键的转移。