epoxidation of α-cyclopropylidene alcohols). The isomerisation, either spontaneous or through reaction with lithium halides, of oxaspiropentyl ketones and acetals, gives 2-acyl-cyclobutanones and corresponding mono-acetals. These new unstable 1,3-diones nust be stored in CCl4 solution. They are present in the dione form only. They add water and methanol, in acidic and even in neutral medium, leading to ring
Oxaspiropentyl ketones and acetals prepared from α-cyclopropylidene ketones and acetals undergo, with lithium halides, isomerisation to 2-acylcyclobutanones and monoacetals.
[EN] METABOTROPIC GLUTAMATE RECEPTOR MODULATORS<br/>[FR] MODULATEURS DES RÉCEPTEURS GLUTAMATERGIQUES MÉTABOTROPES
申请人:MERZ PHARMA GMBH & CO KGAA
公开号:WO2012085166A1
公开(公告)日:2012-06-28
The invention relates to heterocyclic derivatives as well as their pharmaceutically acceptable salts. The invention further relates to a process for the preparation of such compounds. The compounds of the invention are mGluR5 modulators and are therefore useful for the control and prevention of acute and/or chronic neurological disorders.
Nickel-Catalyzed Intermolecular [3 + 2 + 2] Cocyclization of Ethyl Cyclopropylideneacetate and Alkynes
作者:Shinichi Saito、Manami Masuda、Shinsuke Komagawa
DOI:10.1021/ja0494306
日期:2004.9.1
The [3 + 2 + 2] cocyclization of ethylcyclopropylideneacetate (1a) and terminal alkynes (2) proceeded smoothly in the presence of 10 mol % "Ni(PPh3)2", which was prepared in situ from Ni(cod)2 and PPh3. The high reactivity of 1a, which was induced by the introduction of an electron-withdrawing group, is very important for the progress of this reaction. The cycloheptadiene derivatives were synthesized
The [3 + 2 + 2] cocyclization of ethylcyclopropylideneacetate (1a) and various alkynes proceeded smoothly in the presence of Ni(cod)2–PPh3. The cycloheptadiene derivatives were synthesized in highly selective manners. The unique reactivity of 1a was essential for the progress of the reaction. The observed regioselectivity of the product formation and the mechanism of the reaction are discussed.