carried out the stereoselectivesynthesis of (-)-β-conhydrine and (+)-α-conhydrine, two bioactive α-hydroxyalkyl-substituted piperidines, using the commercially available and inexpensive amino alcohol (S,S)-(+)-pseudoephedrine as chiralauxiliary. The key step of this synthesis relies on new methodology previously developed in our group, consisting of the chemo- and diastereoselective addition of Grignard
(<i>S</i>,<i>S</i>)-(+)-Pseudoephedrine α-Iminoglyoxylamide as a Chiral Glycine Cation Equivalent: A Modular and Flexible Approach to Enantioenriched α-Amino Ketones
作者:Nerea Ruiz、Jose L. Vicario、Dolores Badía、Luisa Carrillo、Beatriz Alonso
DOI:10.1021/ol800934r
日期:2008.6.1
S)-(+)-pseudoephedrine as a valuable chiral electrophile for the preparation of alpha-amino carbonyl compounds. In this context, the addition of Grignardreagents to the azomethine moiety of this chiral electrophile afforded the expected alpha-amino amide adducts in good yields and diastereoselectivities. Moreover, these adducts have been transformed into enantioenriched alpha-amino ketones by exploiting