Palladium-catalyzed one-pot synthesis of polysubstituted furans from alkynoates and 2-yn-1-ols
摘要:
Easily accessible propargyl vinyl ethers are found to be acyclic precursors to construct furan derivatives. According to the reactive behavior of the substrates and the regulation of reaction conditions, three synthetic routes to polysubstituted furans via palladium-catalyzed reactions of propargyl vinyl ethers in situ-prepared from alkynoates and 2-yn-1-ols are presented herein. These methods could have potential application in synthetic and pharmaceutical chemistry for its facilitation and accessible starting materials. (C) 2011 Elsevier Ltd. All rights reserved.
A new practical and economical process for the synthesis of substituted furan derivatives has been developed by an FeCl3-catalyzed reaction of α-hydroxy ketones with activated alkynes. This methodology represents a highly efficient synthetic route to electron-deficient furans for which catalytic approaches are scarce. Furthermore, this transformation is associated with readily available substrates
DABCO-Catalyzed Synthesis of Trifluoromethylated Furans from Propargyl Alcohols and Methyl 2-Perfluoroalkynoate
作者:Qinglei Chong、Xiaoyi Xin、Chunxiang Wang、Fan Wu、Haolong Wang、Ji-cheng Shi、Boshun Wan
DOI:10.1021/jo4028424
日期:2014.3.7
The DABCO-catalyzed reaction of propargyl alcohols with methyl 2-perfluoroalkynoate to give trifluoromethylated furans in up to 98% yield under mild conditions has been developed. The established allene-enol and control experiments indicate that the reaction should proceed through a Michael addition and Claisen rearrangement/cyclization process.