Derivatives of heterocycles with 5 members, their preparation and their use as medicaments
申请人:——
公开号:US20040132788A1
公开(公告)日:2004-07-08
The invention relates to thiazole, oxazole, imidazole, isoxazole and isoxazoline derivatives of general formula (I)
1
wherein Het is thiazole, oxazole, imidazole, isoxazole or isoxazoline, n is an integer from 0 to 6, A is notably selected from various optionally substituted aromatic radicals, B is notably hydrogen, alkyl or phenyl, R
1
and R
2
are notably independently hydrogen, alkyl or cycloalkyl and &OHgr; is —NR
46
R
47
or —OR
48
R
46
and R
47
are notably independently hydrogen, alkyl, cycloalkyl or —(CH
2
)
k
—COOR
51
, R
51
is notably alkyl or haloalkyl and R
48
is notably hydrogen or alkyl.
These compounds have advantageous pharmacological properties which allow their use in therapeutics, notably for treating neurodegenerative disorders or pain.
Mechanism of the Double Aldol Reaction: The First Spectroscopic Characterization of a Carbon-Bound Boron Enolate Derived from Carboxylic Esters
作者:Atsushi Abiko、Tadashi Inoue、Satoru Masamune
DOI:10.1021/ja0260014
日期:2002.9.1
The novel doublyborylatedenolate is identified as an intermediate of the doublealdolreaction of acetate esters. As a precursor to the formation of the doublyborylatedenolate, carbon-bound boron enolates of carboxylic esters are spectroscopically characterized for the first time. When 2,6-diisopropylphenyl acetate (10d) is treated with c-Hex(2)BOTf (1.3 equiv) and triethylamine (1.5 equiv) in
Reactions of tris (1,2-ethanediolato)tungsten (VI) with phenyl acetates. X-ray structures of three products
作者:Ari Lehtonen、Reijo Sillanpaa
DOI:10.1016/s0277-5387(98)00281-2
日期:1998.12
Abstract Tungsten (VI) complex [W(eg)3] (eg=ethanediolate dianion) reacts with phenylacetates leading to the displacement of one or three diolato ligands. Two types of phenoxides, [W(O–C6H4R-4)6] (R=H, Me, Cl) and [W(eg)2 (OC6H3R2′-2,6)2] (R′=Me, i Pr) are formed, depending on the nature of phenyl group. The X-ray crystal structure determinations of [W(OC6H5)6], [W(eg)2 (OC6H3Me2-2,6)2] and [W(eg)2
Abstract Esterification of several types of mono- and disubstituted phenols with various mono- and dialkanoyl chlorides was performed in phase-transfer catalysis conditions, using tetrabutylammonium chloride in a mixture of aqueous NaOH and dichloromethane. The process is particularly efficient (almost quantitative yields) as well as rapid (only 5 min reaction time, at a temperature of 0 °C). GRAPHICAL
摘要 在相转移催化条件下,使用四丁基氯化铵和 NaOH 水溶液和二氯甲烷的混合物,对几种类型的单和二取代酚与各种单和二烷酰氯进行酯化反应。该过程特别有效(几乎是定量的产率)和快速(仅 5 分钟反应时间,在 0 °C 的温度下)。图形概要
Antioxidant Building Blocks I. The Unexpected C-Acetylation of 2,6-Di-tert-butylphenol with Isopropenyl Acetate
作者:Tibor Gizur、György G. Ferenczy、Éva Ágai-Csongor、György Domány
DOI:10.1135/cccc19961244
日期:——
While the reaction of some 2-substituted and 2,6-disubstituted phenols with isopropenyl acetate resulted in the corresponding phenol acetates, in the reaction of 2,6-di-tert-butylphenol, a useful starting material of antioxidant building blocks, under the same conditions 4-acetyl-2,6-di- tert-butylphenol was the only product.