Intramolecular Etherification and Polyene Cyclization of π-Activated Alcohols Promoted by Hot Water
作者:Feng-Zhi Zhang、Yan Tian、Guo-Xing Li、Jin Qu
DOI:10.1021/jo502636d
日期:2015.1.16
Hot water, acting as a mildly acidic catalyst, efficientlypromoted intramolecular direct nucleophilic substitution reactions of unsaturatedalcohols with heteroatom or carbon nucleophiles. In a mixed solvent of water and 1,1,1,3,3,3-hexafluoro-2-propanol (HFIP), polyene cyclizations using allylic alcohols as initiators gave the desired cyclized products, and in neat HFIP, a tricyclization reaction
Novel Conversions of Furandiols and Spiroacetal Enol Ethers into Cyclopentenones: Implications of the Isomerization Mechanism of 2-Furylcarbinols into Cyclopentenones
作者:Biao-Lin Yin、Yu-Lin Wu、Jin-Qiang Lai
DOI:10.1002/ejoc.200900129
日期:2009.6
acid-catalyzed conversions of furandiols 8 and its dehydration spiroacetalized products 9 into oxabicyclic cyclopentenones 10 in good to excellent yields are reported. To disclose the mechanism of these conversions, the fact that H2O catalyzes the conversion of 9 into 10 is presented and intermediates 9k and 20i have been structurally verified. In addition, two other related conversions of spiroacetal enol ethers