Synthese von 4,4-Bis(trifluormethyl)-1-oxabuta-1,3-dienen
摘要:
Silyl enol ethers (1) and hexafluoroacetone (2) react to give O-silylated aldol adducts 3 which, after desilylation with methanol/hydrochloric acid, are transformed into 4.4-bis(trifluoromethyl)-1-oxabuta-1,3-dienes (5) on treatment with trifluoroacetic acid anhydride/pyridine.
This invention relates to fluorinated alkoxy-imino metallic complexes and their use in catalyst systems for the polymerisation or oligomerisation of ethylene and alpha-olefins.
Efficient and convenient entry to β-hydroxy-β-trifluoromethyl-β-substituted ketones and 2,6-disubstituted 4-trifluoromethylpyridines based on the reaction of trifluoromethyl ketones with enamines or imines
The reactions of trifluoromethyl ketones with enamines or imines are described. The reaction of trifluoroacetone with enamines or imines followed by hydrolysis gave the corresponding β-hydroxy-β-trifluoromethyl-β-methyl ketones in good yields. The reaction of trifluoromethylated β-diketones with enamines in the presence of ammonium acetate gave 4-trifluoromethylated pyridines exclusively in good yields, without any detectable amount of regioisomers.
Convenient synthesis of mono- and di-β-hydroxy-β-bis(trifluoromethyl)-(di)imines from β-hydroxy-β-bis(trifluoromethyl)-ketones and (di)amines
作者:Nicolas Marquet、Ekaterina Grunova、Evgueni Kirillov、Miloud Bouyahyi、Christophe M. Thomas、Jean-François Carpentier
DOI:10.1016/j.tet.2007.10.096
日期:2008.1
A series of novel β-hydroxy-β-bis(trifluoromethyl)-imines (2a–j) and di(β-hydroxy-β-bis(trifluoromethyl))-diimines (3a–f) were prepared in moderate to good yields via a simple two-step approach: first, β-hydroxy-β-bis(trifluoromethyl)-ketones (1a–c) were obtained by a catalyst-free aldol reaction between liquid hexafluoroacetone sesquihydrate and ketones (acetone, acetophenone, and pinacolone, respectively);
Processes for producing fluorine-containing 2,4-diols and their derivatives
申请人:Komata Takeo
公开号:US20050215836A1
公开(公告)日:2005-09-29
A process for producing a fluorine-containing 2,4-diol represented by the formula [4],
wherein R
1
represents a hydrogen atom or an acyclic or cyclic alkyl group having a carbon atom number of 1 to 7; R
2
represents an acyclic or cyclic alkyl group having a carbon atom number of 1 to 7, a phenyl group, or a substituted phenyl group; and R
1
and R
2
are optionally bonded to each other to form a ring, includes reducing a hydroxy ketone represented by the formula [3],
wherein R
1
and R
2
are defined as above, by hydrogen in the presence of a ruthenium catalyst.
steps were verified for the three-component domino cyclisation affording (pyrrolo)quinazolines from 2-(aminomethyl)aniline, a very reactive oxo compound and “usual” oxo compound. The first step was a rapid reaction of very reactive oxo compound (trifluoropyruvate or hexafluoroacetone) with benzylic amino group to form hemiaminal, but not imine; the second step was the reaction of oxo compound with aromatic