Enantioselective Synthesis of Pyrrolizidinone Scaffolds through Multiple-Relay Catalysis
作者:Marcos Escolano、Javier Torres Fernández、Fernando Rabasa-Alcañiz、María Sánchez-Roselló、Carlos del Pozo
DOI:10.1021/acs.orglett.0c03344
日期:2020.12.18
A triple-tandem protocol for the synthesis of the pyrrolizidinone skeleton has been devised. It involves a cross metathesis–intramolecular aza-Michael reaction–intramolecular Michael addition tandem sequence, starting from N-pentenyl-4-oxo-2-alkenamides and conjugatedketones. In the presence of two cooperative catalysts, namely the second-generation Hoveyda–Grubbs catalyst and (R)-TRIP-derived BINOL
Spatially-defined macrocyclic compounds useful for drug discovery
申请人:Tranzyme Pharma Inc.
公开号:EP2316846A2
公开(公告)日:2011-05-04
Novel spatially-defined macrocyclic compounds containing specific conformational control elements are disclosed. Libraries of these macrocycles are then used to select one or more macrocycle species that exhibit a specific interaction with a particular biological target. In particular, compounds according to the invention are disclosed as agonists or antagonists of a mammalian motilin receptor and a mammalian ghrelin receptor.
Pent-4-en-1-amines are reactive to fluoroalkyl iodides with respect to sodium dithionite initiated free radical addition reactions. We report here the development of a novel and efficient synthesis of 2-fluoroalkyl pyrrolidine derivatives by sodium dithionite initiated one-pot reaction of pent-4-en-1-amines bearing various protecting groups with fluoroalkyl iodides. Among which, the N-benzyl-pent-4-en-1-amine