Synthesis and cycloadditions of 9H-furo[3,4-b][1]benzo(thio)pyran-9-ones: furan ring formation by a novel hydrolytically induced cycloreversion
摘要:
C-2 lithiation of acetals 2 followed by trapping with aldehydes gives 3. Subsequent unmasking of the acetal function provides furobenzo(thio)pyrans 4, cycloadditions of which have been investigated. (C) 2002 Elsevier Science Ltd. All rights reserved.
DABCO-Catalyzed Reaction of α-Halo Carbonyl Compounds with Dimethyl Acetylenedicarboxylate: A Novel Method for the Preparation of Polysubstituted Furans and Highly Functionalized 2<i>H</i>-Pyrans
作者:Mingjin Fan、Zeyi Yan、Weimin Liu、Yongmin Liang
DOI:10.1021/jo050903g
日期:2005.9.1
Polysubstituted furans and highly functionalized 2H-pyrans were prepared in good yields by DABCO-catalyzed reactions of α-halo carbonyl compounds with dimethylacetylenedicarboxylate (DMAD) at room temperature.
A Mild, Convenient and Efficient Single-Step Method for the Synthesis of Polysubstituted Furans via Ammonium Ylide Routes
作者:Yongmin Liang、Mingjin Fan、Lina Guo、Xueyuan Liu、Weimin Liu
DOI:10.1055/s-2004-834944
日期:——
A new and convenient cyclization method for the synthesis of polysubstituted furans in a single-step via ammonium ylide routes was reported. In this process, dimethyl acetylenedicarboxylate reacted with ammonium ylide to produce polysubstituted furan in the presence of anhydrous K2CO3 at room temperature. It is very economical, environmentally friendly and very easy to carry out.
Regiospecific synthesis of polysubstituted furans with mono- to tricarboxylates from various sulfonium acylmethylides and acetylenic esters
作者:Jun Dong、Hongguang Du、Jiaxi Xu
DOI:10.1039/c9ra03563j
日期:——
Polysubstituted furans were prepared in moderate to good yields from various sulfur ylides and alkyl acetylenic carboxylates. The direct reactions of dimethylsulfonium acylmethylides with dialkyl acetylenedicarboxylates afforded dialkyl furan-3,4-dicarboxylates through a tandem sequence of Michael addition, intramolecular nucleophilic addition, 4π ring opening, intramolecular Michael addition, and