Synthesis of 3-Trifluoroethylfurans by Palladium-Catalyzed Cyclization−Isomerization of (Z)-2-Alkynyl-3-trifluoromethyl Allylic Alcohols
摘要:
Hydroiodonation of trifluoromethyl propargylic alcohols 1 regio- and stereoselectively produce (Z)-2-iodo-3-trifluoromethyl allylic alcohols 2. (Z)-2-Alkynyl-3-trifluoromethyl allylic alcohols 5, available through Pd(PPh3)(4)-mediated coupling of 2 and terminal alkynes 4, cyclize and subsequently isomerize to 3-trifluoroethylfurans 6 upon catalysis under PdCl2(CH3CN)(2) in THF at 5-10 degrees C.
The first synthesis of 4-trifluoromethyl-2H-pyrans by palladium-catalyzed cyclization of (E)-3-alkynyl-3-trifluoromethyl allylic alcohols
作者:Feng-Ling Qing、Wen-Zhong Gao
DOI:10.1016/s0040-4039(00)01333-2
日期:2000.9
The cross-coupling of (Z)-3-iodo-3-trifluoromethyl allylic alcohols 4 with terminal alkynes 5 in the presence of Pd(PPh3)(4) and CuI gave conjugated (E)-3-alkynyl-3-trifluoromethyl allylic alcohols 2 in high yield. 4-Trifluoromethyl-2N-pyrans 7 were prepared from the cyclization of 2 using PdCl2(CH3CN)(2) catalysis. (C) 2000 Elsevier Science Ltd. All rights reserved.
Iodocyclization of trifluoromethylallenic phosphonates: an efficient approach to trifluoromethylated oxaphospholenes
作者:Peng Li、Zhen-Jiang Liu、Jin-Tao Liu
DOI:10.1016/j.tet.2010.10.040
日期:2010.12
alpha-Trifluoromethylallenic phosphonates were prepared by the reaction of diethyl chlorophosphite (DECP) and 4,4,4-trifluorobut-2-yn-1-ols in the presence of Et3N. The iodocyclization of these fluorine-containing allenic phosphonates was achieved with iodine under mild conditions to give the corresponding trifluoromethylated oxaphospholenes in moderate to good yields. (C) 2010 Elsevier Ltd. All rights reserved.
Synthesis of 3-Trifluoroethylfurans by Palladium-Catalyzed Cyclization−Isomerization of (<i>Z</i>)-2-Alkynyl-3-trifluoromethyl Allylic Alcohols
作者:Feng-Ling Qing、Wen-Zhong Gao、Jiewen Ying
DOI:10.1021/jo991463u
日期:2000.4.1
Hydroiodonation of trifluoromethyl propargylic alcohols 1 regio- and stereoselectively produce (Z)-2-iodo-3-trifluoromethyl allylic alcohols 2. (Z)-2-Alkynyl-3-trifluoromethyl allylic alcohols 5, available through Pd(PPh3)(4)-mediated coupling of 2 and terminal alkynes 4, cyclize and subsequently isomerize to 3-trifluoroethylfurans 6 upon catalysis under PdCl2(CH3CN)(2) in THF at 5-10 degrees C.