Tandem synthesis of polypropionate chains–highly stereoselective synthesis of the ansa chain of streptovaricin U and protostreptovaricins based on stereospecific methylation of γ,δ-epoxy acrylates by trimethylaluminium
摘要:
The highly stereoselective synthesis of the ansa chain segment 23 of streptovaricin U and protostreptovaricins (I and II) is achieved by stereospecific methylation of gamma,delta-epoxy acrylates with trimethylaluminium.
Tandem synthesis of polypropionate chains–highly stereoselective synthesis of the ansa chain of streptovaricin U and protostreptovaricins based on stereospecific methylation of γ,δ-epoxy acrylates by trimethylaluminium
摘要:
The highly stereoselective synthesis of the ansa chain segment 23 of streptovaricin U and protostreptovaricins (I and II) is achieved by stereospecific methylation of gamma,delta-epoxy acrylates with trimethylaluminium.
Epoxidation of 4-methyl-5-(triethylsilyl)oxyallyl alcohol system with m-chloroperoxybenzoicacid (MCPBA) has been found to occur highly stereoselectively and in high yields from the opposite side of the C5 triethylsiloxy group regardless of the stereochemistry of an adjacent methyl group.