O-Silylated enolates in organic synthesis: α-Alkylation of carbonyl compounds by 1,3-dithienium fluoroborate.
作者:Ian Paterson、Lee G. Price
DOI:10.1016/s0040-4039(01)90564-7
日期:1981.1
The O-silylated enolates of ketones, aldehydes, esters, and lactones can be regiospecifically alkylated by 1,5-dithienium fluoroborate to give the selectivity protected β-dicarbonyl compounds.
Weak force in action: In the title reaction, the palladium catalyst (see figure, left) uses weak CH⋅⋅⋅O hydrogen bonding to control the absolute configuration of the new stereocenter. A similar palladium catalyst (right) used conventional NH⋅⋅⋅O hydrogen bonding to guide stereoselection.