polysubstituted furans were synthesized from furan derivatives involving copper-catalyzed ringopening of the furanring. This synthetic method possesses the advantages of readily available starting materials, mild reaction conditions, and short steps. A range of polysubstituted furans were synthesized from furan derivatives involving copper-catalyzed ringopening of the furanring. This synthetic
A class of polysubstituted functionalized furans was synthesized efficiently starting from readily available furans involving the oxidative ringopening of the furanrings using NBS as an oxidant. The reaction proceeded through a sequence of oxidative dearomatization of the furanring/spirocyclization/aromatization.
作者:Matthew B. Plutschack、Peter H. Seeberger、Kerry Gilmore
DOI:10.1021/acs.orglett.6b03237
日期:2017.1.6
method to access highly reactive intermediates from cheap, readily available, and shelf-stable reagents to perform clean chemical transformations. Here, we report the first photoredox-catalyzed Achmatowicz reaction of furfuryl alcohol derivatives to produce functionalized dihydropyranones while only forming easily separable NaHSO4 as a byproduct. The water solubility of the byproduct facilitates direct
Interrupted Furan–Yne Cyclization: Access to Unsaturated Dicarbonyl Compounds and Their Subsequent Transformation into Functionalized Pyridazines
作者:Yury A. Vasev、Ekaterina R. Nasibullina、Anton S. Makarov、Maxim G. Uchuskin
DOI:10.1021/acs.orglett.3c02794
日期:2023.11.3
The key carbenoidintermediate of transition-metal-catalyzed furan–yne cyclization in Hashmi phenol synthesis could be efficiently intercepted with water under the developed reaction conditions in order to provide access to functionalized unsaturated dicarbonyl compounds that might serve as convenient precursors for the straightforward synthesis of annulated pyridazines.
New procedures for the enantioselective oxidation of sulfides under stoichiometric and catalytic conditions
作者:Antonio Massa、Francesca R Siniscalchi、Valeria Bugatti、Alessandra Lattanzi、Arrigo Scettri
DOI:10.1016/s0957-4166(02)00326-9
日期:2002.7
Acid-catalyzed oxidation of 2-furylcarbinols with hydrogen peroxide affords alternatively 2-(1-hydroperoxyalkyl)furans 2 or 6-hydroperoxy-2H-pyran-3(6H)-ones 3. Compounds of the type 2 and 3 have been used Lis oxygen donors in efficient stoichiometric or catalytic procedures for the asymmetric sulfoxidation of prochiral sulfides in the presence of Ti(O-i-Pr)(4)/L-DET or Ti(O-i-Pr)(4)/(R)-BINOL/H2O systems. Positive non linear effects, (+)-NLE, were observed in the enantioselective oxidation of methyl p-tolyl sulfide, promoted by enantiomierically enriched Ti(IV)/BINOL/H2O complexes. (C) 2002 Elsevier Science Ltd. All rights reserved.