A Practical and Effective Ruthenium Trichloride-Based Protocol for the Regio- and Stereoselective Catalytic Hydroamidation of Terminal Alkynes
作者:Lukas J. Gooßen、Matthias Arndt、Mathieu Blanchot、Felix Rudolphi、Fabian Menges、Gereon Niedner-Schatteburg
DOI:10.1002/adsc.200800508
日期:——
4-(dimethylamino)pyridine and potassium carbonate, effectively promotes the addition of secondaryamides, lactams and carbamates to terminalalkynes under formation of (E)-anti-Markovnikov enamides. The scope of the new protocol is demonstrated by the synthesis of 24 functionalized enamide derivatives, among them valuable intermediates for organic synthesis.
(E)‐β‐Iodoenamides and (E)‐β‐iodoenimides can be easily obtained from N‐vinyl derivatives (N‐vinylamides and N‐vinylimides) by stereoselective ruthenium‐catalysed silylative coupling with vinyltrimethylsilane (Marciniec coupling) and subsequent stereospecific silicon–iodine exchange. Bromodesilylation of (E)‐β‐silylenimides affords (E)‐β‐bromoenimides, while the analogous reactions involving (E)‐β‐silylenamides
An effective stereoselectivesynthesis of E-N-2-(silyl)vinylamides via silylative coupling of vinyl amides such as N-vinylpyrrolidinone, N-vinylphthalimide, and N-vinylformamide with vinyltrisubstituted silanes catalyzed by [RuH(Cl)(CO)(PCy3)2] I is described.
通过[RuH(Cl)(CO)(PCy)催化的乙烯基酰胺(如N-乙烯基吡咯烷酮,N-乙烯基邻苯二甲酰亚胺和N-乙烯基甲酰胺)与乙烯基三取代的硅烷的甲硅烷基化偶联,可有效立体选择性合成E - N -2-(甲硅烷基)乙烯基酰胺3)2 ] I被描述。