106268-95-5Relevant articles and documents
Novel synthesis and enzymatic resolution of (±)-2,3-epoxy propyl esters
Nair, Ranjeet V.,Patil, Prashant N.,Salunkhe, Manikrao M.
, p. 2559 - 2566 (2007/10/03)
A novel method of synthesizing glycidyl esters (±) -2,3-epoxy propyl esters has been developed involving reaction of epichlorohydrin with sodium salt of carboxylic acids in the presence of 15-crown-5 as catalyst with excellent yields. Enzymatic resolution of these glycidyl esters by lipasePS- C has been achieved with remarkable substrate selectivity.
Migration of aryl groups from silicon to carbon in α,β-epoxysilanes. A new model for hypervalent silicon study
Achmatowicz, Barbara,Jankowski, Pawel,Wicha, Jerzy,Zarecki, Andrzej
, p. 227 - 230 (2007/10/03)
The reaction of (2R,3R)-3-(triphenylsilyl)glycidol (1) with n-Bu4NF·3H2O in THF, followed by treatment of the product with p-nitrobenzoyl chloride yields (2S)-glycidol p-nitrobenzoate (4) and trans-cinnamyl p-nitrobenzoate (6) in a ratio of 1:1.5. The reaction of (R)Si-(2R,3R)- or (R)Si-(2S,3S)-3-[(methyl)(phenyl)(1-naphthyl)silyl]-glycidols, 7 or 8 respectively, with n-Bu4NF·3H2O affords mixtures of the respective glycidol, trans-cinnamyl alcohol and 3-(1-naphthyl)allyl alcohol. No significant difference in the product distribution in reaction of these two diasteromers was observed.
Catalytic Asymmetric Epoxidation and Kinetic Resolution: Modified Procedures Including in Situ Derivatization
Gao, Yun,Hanson, Robert M.,Klunder, Janice M.,Ko, Soo Y.,Masamune, Hiroko,Sharpless, K. Barry
, p. 5765 - 5780 (2007/10/02)
The use of 3A or 4A molecular sieves ( zeoiltes ) substantially increases the scope of the titanium(IV)-catalyzed asymmetric epoxidation of primary allylic alcohols.Whereas without molecular sieves epoxidations employing only 5 to 10 mol percent Ti(O-i-Pr)4 generally led to low conversion or low enantioselectivity, in the presence of molecular sieves such reactions generally led to high conversion (>95percent) and high enantioselectivity (90-95percent ee).The epoxidations of 20 primary allylic alcohols are described.Especially noteworthy are the epoxidations of cinnamyl alcohol, 2-tetradecyl-2-propen-1-ol, allyl alcohol, and crotyl alcohol-compounds which heretofore had been considered difficult substrates for asymmetric epoxidation.In the case of allylic alcohol, the use of cumene hydroperoxide substantially increases both the reaction rate and the conversion, even in the absence of molecular sieves.In general, enantioselectivities are slightly depressed (by 1-5percent ee) relative to reactions employing 50-100 mol percent Ti(O-i-Pr)4.The epoxidation of low molecular weight allylic alcohols is especially facilitated and, in conjuction with in situ derivatization, provides for the synthesis of many epoxy alcohol synthons which were previously difficult to obtain.The kinetic resolution of four secondary allylic alcohols with 10 mol percent Ti(O-i-Pr)4 is also described.The role of molecular sieves in the reaction and the effects of variation in reaction stoichiometry, oxidant, and tartrate are discussed.