Versatile synthesis of α, β-acetylenic ketones by oxidative nucleophilic addition of vanadium acetylides
作者:Toshikazu Hirao、Daisuke Misu、Toshio Agawa
DOI:10.1016/s0040-4039(00)84141-6
日期:1986.1
Treatment of aldehydes with vanadium acetylides generated from equimolar amounts of vanadium trichloride and acetylenic Grignard or lithium compounds gave α,β-acetylenicketones via oxidative nucleophilic addition.
The invention relates to compounds of formula
wherein the substituents are as described in claim
1
. Compounds of formula I are modulators for amyloid beta and thus, they may be useful for the treatment or prevention of a disease associated with the deposition of β-amyloid in the brain, in particular Alzheimer's disease, and other diseases such as cerebral amyloid angiopathy, hereditary cerebral hemorrhage with amyloidosis, Dutch-type (HCHWA-D), multi-infarct dementia, dementia pugilistica and Down syndrome.
A novel stereoselective synthesis of conjugated dienones
作者:Dawei Ma、Yingrui Lin、Xiyan Lu、Yihua Yu
DOI:10.1016/0040-4039(88)85331-0
日期:1988.1
(E,E)-α,β,-γ,δ-Dienones are synthesized stereoselectively from the corresponding α,β-ynones in high yield under the catalysis of a ruthenium hydride complex.
Novel Microwave-Assisted One-Pot Synthesis of Isoxazoles by a Three-Component Coupling-Cycloaddition Sequence
作者:Thomas Müller、Benjamin Willy、Frank Rominger
DOI:10.1055/s-2007-1000856
日期:2008.1
The consecutive Sonogashira coupling of acid chlorides with terminal alkynes, followed by 1,3-dipolar cycloaddition under dielectric heating of in situ generated nitrile oxides from hydroximinoyl chlorides furnishes isoxazoles in moderate to good yields in the sense of a one-pot three-component reaction.
Silica-supported zinc bromide (ZnBr2/SiO2) is an efficient heterogeneous catalyst for the rapidsynthesis of ynones by cross-coupling of acid chlorides with terminal alkynes in good to excellentyieldsundersolvent-freeconditions at roomtemperature.