title: Triflic Acid-Catalyzed Cycloisomerization Reactions of Donor-Acceptor Cyclopropanes: Access to Alkyl 5-Arylfuran-2-carboxylates.
abstract: 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.
authors.affiliation: School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology , 1037 Luoyu Road, Wuhan 430074, People's Republic of China.
authors.forename: Yuequan
authors.initials: Y
authors.lastname: Zhu
authors.affiliation: School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology , 1037 Luoyu Road, Wuhan 430074, People's Republic of China.
authors.forename: Panpan
authors.initials: P
authors.lastname: Xu
authors.affiliation: School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology , 1037 Luoyu Road, Wuhan 430074, People's Republic of China.
authors.forename: Yuefa
authors.initials: Y
authors.lastname: Gong