Chiralphosphoramides prepared from (S)-proline were used to catalyze the allylation and crotylation of aromatic aldehydes with allylic trichlorosilanes in good enantioselective yields. Phosphoramides 4d and 4m gave chiral homoallylic alcohols and their enantiomers, respectively, with similar levels of enantioselectivity.
Enantioselective addition of diethylzinc to aldehydes catalyzed by o-xylylene-type chiral 1,4-amino alcohols with an aminal structure
作者:Masatoshi Asami、Ayano Hasome、Naoyuki Yachi、Naoya Hosoda、Yoshitaka Yamaguchi、Suguru Ito
DOI:10.1016/j.tetasy.2016.03.007
日期:2016.5
Synthesis and application to asymmetric allylic amination of substituted monodonor diazaphospholidine ligands
作者:Christopher W Edwards、Mark R Shipton、Nathaniel W Alcock、Howard Clase、Martin Wills
DOI:10.1016/s0040-4020(03)01062-7
日期:2003.8
The synthesis of a series of substituted monodonor diazaphospholidine ligands is described. A regioselective lithiation process is a key step in one of these syntheses. The compounds are designed to be incorporated into soluble polymer and other solid phase supports. Enantiomeric excesses of up to 88% were observed when these compounds were employed in palladium-catalysed asymmetric amination reactions