α,α-Alkylation-Halogenation and Dihalogenation of Sulfoxonium Ylides. A Direct Preparation of Geminal Difunctionalized Ketones
作者:Rafael D. C. Gallo、Anees Ahmad、Gustavo Metzker、Antonio C. B. Burtoloso
DOI:10.1002/chem.201704609
日期:2017.12.1
A one‐pot alkylation–halogenation of ketosulfoxonium ylides in the presence of alkyl halides is described. The method furnishes several gem‐difunctionalized haloketones (an alkyl and F, Cl, Br, or I) in good yields. Replacing alkyl halides with a mixture of electrophilic halogen species and various halide anions led to gem‐dihalogenated ketones containing a combination of the same or two different
Syntheses of heterocyclic fused thiazole acetic acids. 2
作者:Stanley C. Bell、Peter H. L. Wei
DOI:10.1021/jm00226a016
日期:1976.4
A number of tricyclic and bicyclic fused thiazole-2-acetic acid derivatives were prepared and the chemistry and biological properties of these compounds are discussed. Many of the esters exhibited antitubercular activity. The bicyclic thiazole-2-acetic acids had antidepressant activity. Interesting antimetastatic activity against Lewis lung tumor in mice was found with several compounds, in particular
2-Aryl Imidazo[1,2-a]Pyridine-3-Acetamide Derivatives, Preparation Methods and Uses Thereof
申请人:Yang Rifang
公开号:US20130203754A1
公开(公告)日:2013-08-08
Disclosed are 2-arylimidazo[1,2-
a
]pyridine-3-acetamide derivatives represented by formula I, their tautomer, racemate or optical isomer, their pharmaceutically acceptable salt, or their solvates, wherein R
1
, R
2
, R
3
and R
4
are defined as in the specification. Preparation methods of said compounds and use of said compounds in treating and/or preventing central nervous system disease associated with TSPO functional disorder
Mechanism of the lanthanum bromide assisted electrochemical aldolization of .alpha.-bromo ketones
作者:Albert J. Fry、Marko Susla
DOI:10.1021/ja00191a019
日期:1989.4
the aldol 2-benzoyl-1-phenylpropanol by electrochemical reduction of alpha}-bromopropiophenone in the presence of benzaldehyde and lanthanum bromide. The aldol condensation occurs by reaction of the free (lithio) enolate with a lanthanum bromide-benzaldehyde-tetrahydrofuran complex. Electrochemical reduction of the bromo ketone forms the Z enolate highly stereospecifically. The erythro aldol is formed
线性扫描伏安法、各种实验条件下的制备电解和捕获实验已被用于探索在苯甲醛存在下通过电化学还原 α}-溴苯丙酮形成羟醛 2-苯甲酰基-1-苯基丙醇的机制和溴化镧。羟醛缩合通过游离(锂硫)烯醇化物与溴化镧-苯甲醛-四氢呋喃络合物的反应而发生。溴酮的电化学还原形成高度立体定向的 Z 烯醇化物。赤型羟醛最初是立体选择性形成的,但缩合是可逆的,并且主要含有苏式异构体的羟醛的平衡混合物从电解中分离出来。
Continuous multistep synthesis of 2-(azidomethyl)oxazoles
作者:Thaís A Rossa、Nícolas S Suveges、Marcus M Sá、David Cantillo、C Oliver Kappe
DOI:10.3762/bjoc.14.36
日期:——
An efficient three-step protocol was developed to produce 2-(azidomethyl)oxazoles from vinyl azides in a continuous-flow process. The general synthetic strategy involves a thermolysis of vinyl azides to generate azirines, which react with bromoacetyl bromide to provide 2-(bromomethyl)oxazoles. The latter compounds are versatile building blocks for nucleophilic displacement reactions as demonstrated