Developments in Meyers’ Lactamization Methodology: En Route to Bi(hetero)aryl Structures with Defined Axial Chirality
摘要:
Highly atroposelective Meyers' lactamization promoted by pivalic acid under microwave irradiation is reported which allows the construction of nonracemic substituted-dibenzo(di)azepine derivatives through a center to axial chirality transfer principle, controlling the otherwise configurationally labile biaryl axis. This approach provides a straightforward entry to enantioenriched analogues of biorelevant architectures.
Iron or Cobalt-Catalyzed Carbon-Carbon Coupling Reaction of Aryls, Alkenes and Alkines With Copper Reagents
申请人:Knochel Paul
公开号:US20080269514A1
公开(公告)日:2008-10-30
The present invention relates to a process for the formation of carbon-carbon bonds starting from a copper compound of an aryl, heteroaryl, alkene or alkine and an aryl, heteroaryl, alkene or alkine compound having a suitable leaving group. The copper compounds can be prepared inter alia by means of transmetalliziation from a Grignard or lithium compound. Cross-coupling of these compounds with e.g. a halogen-substituted aryl compound is carried out by means of an iron or cobalt catalyst using suitable solvents and suitable additives.
Highly atroposelective Meyers' lactamization promoted by pivalic acid under microwave irradiation is reported which allows the construction of nonracemic substituted-dibenzo(di)azepine derivatives through a center to axial chirality transfer principle, controlling the otherwise configurationally labile biaryl axis. This approach provides a straightforward entry to enantioenriched analogues of biorelevant architectures.
Iron-Catalyzed Aryl-Aryl Cross-Couplings with Magnesium-Derived Copper Reagents
作者:Ioannis Sapountzis、Wenwei Lin、Christiane C. Kofink、Christina Despotopoulou、Paul Knochel