Modular Synthesis of Fluoro‐Substituted Furan Compounds via Controllable Fluorination of Biomass‐Based 5‐HMF and Its Derivatives
作者:Ze‐Kuan Zhang、Wen‐Yan Xu、Tian‐Jun Gong、Yao Fu
DOI:10.1002/cssc.202301072
日期:2024.1.8
In this study, we present an example of adjustable fluorination of biomass-derived 5-HMF and its oxygen-containing derivatives, synthesize a series of mono-fluoromethyl, difluoromethyl, and acylfluoro-substituted furan compounds. These fluoro-substituted furan compounds can be further transformed to prepare drug analogs, thereby offering a novel approach for the high-value utilization of biomass molecules
A new, mild method to prepare alpha-trifluoromethylated amides bearing an additional trans-configured double bond in gamma-position is described. Treatment at room temperature of fluorinated and non-fluorinated allylic alcohols 1 and 2 with the 1,1,3,3,3-pentafluoropropene-diethylamine adduct (PFPDEA) in the presence of triethylamine as base gave the products of [3,3]-sigmatropic Eschenmoser-Claisen-type rearrangements with good yields and excellent diastereoselectivity due to chair-like conformations of transition states. Starting with enantiomerically enriched allylic alcohols chirality transfer from carbon 3 of the allylic system to carbon 2 of the final alpha-trifluoromethyl carboxamides was observed. This methodology was applied to both simple and more complex, including terpenic, allylic alcohols and might be developed to an alternative strategy to the well-known electrophilic alpha-trifluoromethylation of carbonyl compounds. (C) 2012 Elsevier B.V. All rights reserved.
JANZEN, ALEXANDER F.;MARAT, RONALD KIRK, J. FLUOR. CHEM., 38,(1988) N 2, 205-208