undergo [2+2+2] cyclotrimerization with nitriles in the presence of a catalytic amount of the ruthenium complex Cp*RuCl(cod) (10 mol%) to afford the corresponding halopyridines under ambient conditions in good isolated yields (up to 90%). The halopyridines are formed as two separable regioisomers. This is the first example of a direct synthesis of halopyridines from haloalkynes and nitriles.
Silver-Catalyzed Selective Multicomponent Coupling Reactions of Arynes with Nitriles and Isonitriles
作者:Sourav Ghorai、Yongjia Lin、Yuanzhi Xia、Donald J. Wink、Daesung Lee
DOI:10.1021/acs.orglett.9b04416
日期:2020.1.17
multicomponent coupling reactions with isonitriles and nitriles are described. Crucial to these reactions is the formation of a silver-aryne complex, which shows differential reactivity toward isonitriles and nitriles to form two different forms of ortho-nitrilium organosilver arene species. Interception of the nitrilium of an aryne-isonitrile adduct with another isonitrile leads to the formation of
Alkynyl chlorides, bromides, and iodides have been tested as [2 + 2 + 2] cycloaddition partners using CpCo(CO)(dimethylfumarate) and Cp*Ru(cod)Cl as precatalysts. A series of cocyclizations between diynyl dihalides and alkynes, as well as intramolecular cycloadditions of triynyl dihalides, has been carried out. While this study confirmed the versatility of the ruthenium complex with all kinds of halides
Ultrafine emulsion containing a haloalkynyl derivative
申请人:L'OREAL
公开号:US20030073689A1
公开(公告)日:2003-04-17
A composition in the form of an ultrafine oil-in-water emulsion in which the mean size of the oil globules ranges from 50 nm to 1000 nm containing a haloalkynyl derivative, preferably 3-iodo-2-propynyl butylcarbamate.