Synthesis and properties of 2-trifluoromethyl-substituted 4-pentenoic and 3,4-pentadienoic acids and their esters
摘要:
The hydrolysis of the acid fluorides of 2-fluorocarbonyl(methoxycarbonyl)-2-trifluoromethyl-4-pentenoic acids (I) and (II), and of 2-fluorocarbonyl-(methoxycarbonyl)-2-trifluoromethyl-3,4-pentadienoic acids (III) and (IV) gave, under mild conditions, 2-trifluoromethyl-4-pentenoic acid (V) and 2-trifluoromethyl-3,4-pentadienoic acid (VII) or their methyl esters (VI) and (VIII). The reactivity of these compounds was studied.
hydroacyloxylation of unactivated alkenes, offering a streamlined access to relevant γ-lactones, which features the utilization of either a calcium(II) salt or triflimide as a catalyst in hexafluoroisopropanol. This method could be applied to the synthesis of natural products and the late-stage functionalization of natural and bioactive molecules. Additionally, DFT computations were used to elucidate the twist
A one pot synthesis of α-trifluoromethyl unsaturated acids and derivatives via a [3,3]-sigmatropicrearrangement of allyl (or propargyl) fluorovinyl ethers is described.
A one pot synthesis of alpha-trifluoromethyl unsaturated acids via a [3,3]-sigmatropic rearrangement of allyl (or propargyl) fluorovinyl ethers is described. By proto- and iodolactonization. these acids lead to the corresponding trifluoromethylated lactones. (C) 2002 Elsevier Science B.V.. All rights reserved.
A series of trans- and cis-gamma-lactones with high optical purity have been prepared from the lactonization of (S)-(-)-2-(trifluoromethyl)-4-pentenoic acid (>94% ee) under acidic conditions. These materials have been transformed into new types of dopant for ferroelectric liquid crystals possessing a trifluoromethyl group.