The electrochemicalreduction on Hg cathode of a dropping solution of phenacyl bromides in dry acetone-LiClO4 yields 4-aryl-2-methylfurans and acetophenones. In this process the acetone plays a dual role, as solvent and reagent.
A three-step, single purification procedure has been developed for the concise synthesis of substituted furans from arylacyl bromides. (C) 2014 Elsevier Ltd. All rights reserved.
Asymmetric Hydrogenation of Disubstituted Furans
作者:Jędrzej Wysocki、Nuria Ortega、Frank Glorius
DOI:10.1002/anie.201310985
日期:2014.8.11
An enantioselective hydrogenation of disubstitutedfurans has been developed by using a chiral ruthenium catalyst with N‐heterocyclic carbene ligands. This reaction converts furans into valuable enantioenriched disubstituted tetrahydrofurans.
propargylation on corresponding keto-alcohols or by sodiumborohydride mediated reduction of 2-hydroxy-2-propargyl ketones. The furan synthesis proceeded through iodine mediated 5-exo-trig cyclization, dehydration and reductive deiodination. The method was applied to the synthesis of 2-methylfuran fused to phenanthrene, pyrene and acenaphthylene rings.