Sc(OTf)<sub>3</sub>-catalyzed cyclization of α-allylated 1,3-dicarbonyls: an efficient access to 2,2-disubstituted 2,3-dihydrofuran derivatives
作者:Ziping Cao、Rumeng Zhang、Xin Meng、Hui Li、Jie Li、Hongbo Zhu、Guang Chen、Xuejun Sun、Jinmao You
DOI:10.1039/c6ra14051c
日期:——
A method to prepare functionalized 2,3-dihydrofurans by Sc(OTf)3-catalyzed cyclization of α-allylated 1,3-dicarbonyl compounds is reported. The reactions were shown to be operationally simplistic and proceed efficiently for a variety of substrates, leading to the formation of 2,2-disubstituted 2,3-dihydrofurans in good to excellent yields.
Acid catalyzed ring closure reactions of electrophilic alkenes
作者:Roland Verhé、Norbert de Kimpe、Dirk Courtheyn、Laurent de Buyck、Niceas Schamp
DOI:10.1016/0040-4020(82)80073-2
日期:1982.1
3-acyl-2-alkyl-4,5-dihydrofurans. Similar cyclization of α-acyl-α,β-unsaturated esters initially afforded 3-alkoxycarbonyl-2-alkyl-4,5-dihydrofurans which were transformed into 2-acylbutanolides on further reaction with sulfuric acid.
Iodine-Catalyzed Synthesis of Substituted Furans and Pyrans: Reaction Scope and Mechanistic Insights
作者:Domenic P. Pace、Raphaël Robidas、Uyen P. N. Tran、Claude Y. Legault、Thanh Vinh Nguyen
DOI:10.1021/acs.joc.1c00608
日期:2021.6.18
Substituted pyrans and furans are core structures found in a wide variety of natural products and biologically active compounds. Herein, we report a practical and mild catalytic method for the synthesis of substituted pyrans and furansusing molecular iodine, a simple and inexpensive catalyst. The method described is performed under solvent-free conditions at an ambient temperature and atmosphere,