Chiral Nonracemic Pyridine Thiols and Thioethers Applied in Palladium-Catalyzed Allylic Substitution. An Example of Near-Perfect Enantioselection
摘要:
Pyridine thiols and dithiols have been synthesized by base-induced addition of 2,6-lutidine to thiofenchone. These thiols were converted to their thioether derivatives by alkylation. Application of these compounds in palladium-catalyzed allylic substitution on 1,3-diphenylprop-2-enyl acetate gave nearly absolute enantiomeric excess (98%) and high chemical yield (96%). Isolation of a palladium allylic intermediate gave insight in the origin of chiral recognition for these systems.
Chiral Nonracemic Pyridine Thiols and Thioethers Applied in Palladium-Catalyzed Allylic Substitution. An Example of Near-Perfect Enantioselection
摘要:
Pyridine thiols and dithiols have been synthesized by base-induced addition of 2,6-lutidine to thiofenchone. These thiols were converted to their thioether derivatives by alkylation. Application of these compounds in palladium-catalyzed allylic substitution on 1,3-diphenylprop-2-enyl acetate gave nearly absolute enantiomeric excess (98%) and high chemical yield (96%). Isolation of a palladium allylic intermediate gave insight in the origin of chiral recognition for these systems.
New pyridine dithiols: synthesis and structures of complexes with acids
作者:Bartjan Koning、Ron Hulst、Arjan Bouter、Jan Buter、Auke Meetsma、Richard M. Kellogg
DOI:10.1039/a701774j
日期:——
Pyridine dithiols have been synthesized by base-induced addition of
2,6-lutidine to (non-enolisable) thioketones, and have been found to
encapsulate various acids.