Pd-catalyzed direct arylation of 3-fluorofurans utilizing the neighboring effect of fluorine atom: facile synthesis of tetrasubstituted monofluoro furans
摘要:
Pd-catalyzed direct arylation of 3-fluorofurans with a variety of aryl bromides was facilitated by the neighboring effect of fluorine atom to provide tetrasubstituted monofluoro furans in moderate to good yields. (C) 2008 Elsevier Ltd. All rights reserved.
Synthesis of 3-fluoro-2,5-disubstituted furans through ring expansion of <i>gem</i>-difluorocyclopropyl ketones
作者:Tsuyuka Sugiishi、Chihori Matsumura、Hideki Amii
DOI:10.1039/c9ob02713k
日期:——
The synthesis of 3-fluoro-2,5-disubstituted furans from gem-difluorocyclopropyl ketones was accomplished using trifluoromethanesulfonic acid (CF3SO3H) through ringexpansion owing to the activation of the carbonyl group in the starting material. The present synthesis of 3-fluorofurans tolerates substrates designed for products with aromatic substituents at the C-2 and C-5 positions.
由于起始材料中羰基的活化,使用三氟甲磺酸(CF 3 SO 3 H)通过扩环从宝石-二氟环丙基丙基合成3-氟-2,5-二取代的呋喃。本发明的3-氟呋喃的合成耐受设计用于在C-2和C-5位置具有芳族取代基的产物的底物。
Synthesis of 3-Fluoro-2,5-Disubstituted
Furans and Further Derivative Reactions to Access Fluorine-Containing
3,3′-Bifurans and Tetrasubstituted Furans
作者:Gang Zhao、Shi-Zheng Zhu、Peng Li、Zhuo Chai
DOI:10.1055/s-2008-1078053
日期:——
2,5-Disubstituted 3-fluorofurans were synthesized in 42-99% yield via DBU-promoted cyclization reactions of electron-deficient gem-difluorohomopropargyl alcohols. Starting from these compounds, a series of fluorinated 3,3′-bifurans and tetrasubstituted furans were also prepared through a fluorine-directed ortho-functionalization process.
A novel approach of cycloaddition of difluorocarbene to α,β-unsaturated aldehydes and ketones: synthesis of gem-difluorocyclopropyl ketones and 2-fluorofurans
作者:Wei Xu、Qing-Yun Chen
DOI:10.1039/b212232d
日期:2003.3.27
acetals and ketals are easily obtained in moderate yields from the [1 + 2] cycloaddition of difluorocarbene to 1,3-dioxolanes of alpha,beta-unsaturated aromatic aldehydes and ketones. Hydrolysis of these fluorinated compounds under acidic conditions either gives the corresponding gem-difluorocyclopropyl ketones or 1-aryl-2-fluorofuran derivatives through intramolecular carbonium rearrangement with simultaneous
Pd-catalyzed direct arylation of 3-fluorofurans utilizing the neighboring effect of fluorine atom: facile synthesis of tetrasubstituted monofluoro furans
作者:Peng Li、Zhuo Chai、Gang Zhao、Shi-Zheng Zhu
DOI:10.1016/j.tet.2008.12.026
日期:2009.2
Pd-catalyzed direct arylation of 3-fluorofurans with a variety of aryl bromides was facilitated by the neighboring effect of fluorine atom to provide tetrasubstituted monofluoro furans in moderate to good yields. (C) 2008 Elsevier Ltd. All rights reserved.