Preparation and application of 2-(arylmethoxy)isopinocampheols for the asymmetric aldol reaction of 3,3,3-trifluoropropionates
作者:P. Veeraraghavan Ramachandran、Gowrisankar Parthasarathy、Pravin D. Gagare
DOI:10.1016/j.tetlet.2011.08.034
日期:2011.10
The preparation of 2-(arylmethoxy)isopinocampheols from pinanediol via the DIABL-H reduction of the corresponding aryl aldehyde acetals has been described. A systematic examination of the asymmetricaldol reaction of 3,3,3-trifluoropropionates led to the double diastereoselective aldol reaction of 2-(arylmethoxy)isopinocampheyl 3,3,3-trifluoropropionates providing anti-α-trifluoromethyl-β-hydroxy esters
(Trifluoromethyl)ketene silyl acetal as an equivalent to the trifluoropropionic ester enolate: preparation and aldol-type reactions with acetals
作者:Tsutomu Yokozawa、Takeshi Nakai、Nobuo Ishikawa
DOI:10.1016/0040-4039(84)80047-7
日期:——
The title reagent, readily prepared from methyl β,β,β-trifluoropropionate with trimethylsilyl triflate, is shown to react with a broad variety of acetals to provide the corresponding α-CF3 β-alkoxy esters in good yields.
Reformatsky Reaction of Methyl 2-Bromo-3,3,3-trifluoropropanoate. A Synthetic Method for α-Trifluoromethyl-β-hydroxy Esters
作者:Tsutomu Yokozawa、Nobuo Ishikawa、Takeshi Nakai
DOI:10.1246/cl.1987.1971
日期:1987.10.5
The Reformatsky reagent, prepared from the title bromo-ester and zinc powder in dioxane, is found to be thermally stable enough to undergo addition reactions with aldehydes to afford the α-trifluoromethyl-β-hydroxy esters in high yields. The unique reactivity of the fluorinated zinc reagent is discussed.