Triflic Acid-Catalyzed Cycloisomerization Reactions of Donor–Acceptor Cyclopropanes: Access to Alkyl 5-Arylfuran-2-carboxylates
作者:Yuequan Zhu、Panpan Xu、Yuefa Gong
DOI:10.1021/acs.joc.6b00161
日期:2016.6.3
A direct synthetic strategy starting from alkyl 1-alkoxy-2-aroylcyclopropanecarboxylates was developed for the construction of alkyl 5-arylfuran-2-carboxylates. These donor acceptor cyclopropanes smoothly undergo a simple ring opening reaction or/and cycloisomerization reaction in the presence of acid at room temperature;, which greatly depends on the properties of the acid used in the experiment, Alkyl 5-arylfuran-2-carboxylates were afforded in high yields in triflic acid, whereas alkyl 2,5-dioxo-5-phenylpentanoate became the major product in other protic acids and Lewis acids.