Silver(I)-Catalyzed Aminocyclization of 2,3-Butadienyl and 3,4-Pentadienyl Carbamates: An Efficient and Stereoselective Synthesis of 4-Vinyl-2-oxazolidinones and 4-Vinyltetrahydro-2H-1,3-oxazin-2-ones
Organocatalytic Alkynylation of Aldehydes and Ketones under Phase-Transfer Catalytic Conditions
作者:Torsten Weil、Peter R. Schreiner
DOI:10.1002/ejoc.200500064
日期:2005.6
We developed alkynylations of various aldehydes and ketones under practical phase-transfer conditions at room temperature. The straightforward methodology combines one-pot synthesis and simple workup with good to excellent yields for propargylic alcohols derived fromaliphaticaldehydes and ketones. Even aromaticaldehydes and ketones could be transformed to the corresponding propargylic alcohols in
[GRAPHICS]Asymmetric amination of 2,3-allenyl phosphates with nitrogen nucleophiles such as amines, hydroxylamines, and imides can be performed efficiently using a combination of zerovalent palladium complexes and SEGPHOS or MeOBlPHEP ligand, affording the corresponding optically active 1-aminated derivatives with enantiomeric excess of up to 97% ee.