Further Studies toward the Stereocontrolled Synthesis of Silicon-Containing Peptide Mimics
作者:Dácil Hernández、Karl B. Lindsay、Lone Nielsen、Tina Mittag、Klaus Bjerglund、Stig Friis、Rasmus Mose、Troels Skrydstrup
DOI:10.1021/jo100301n
日期:2010.5.21
Furtherstudies are reported on the utilization of the versatile reaction between chiral sulfinimines and alkyldiphenylsilyl lithium reagents with the goal of preparing a wide range of silanediol-based protease inhibitors. In particular, focus has been placed to demonstrate how a number of genetically encoded amino acid side chains such as serine, threonine, tyrosine, lysine, proline, arginine, aspartate
Stereocontrolled Synthesis of Methyl Silanediol Peptide Mimics
作者:Lone Nielsen、Karl B. Lindsay、Jesper Faber、Niels Christian Nielsen、Troels Skrydstrup
DOI:10.1021/jo701907d
日期:2007.12.1
The treatment of chiral sulfinimines with (methyldiphenylsilyl)lithium gives alpha-(methyldiphenylsilyl)sulfinamides with excellent diastereoselectivity, and in good yield. The presence of alpha-protons on the imines is also well tolerated. The sulfinamide auxiliary is easily removed via treatment with methanolic HCl and the resulting amine extended into peptide chains accordingly. The diphenylsilyl moiety is a resilient protecting group for the corresponding silanediol, which can be unmasked via treatment with TfOH, followed by aqueous hydrolysis. The crude silanediol may be isolated and purified as its corresponding bis-TMS siloxane via protection with TMSCI, and converted back to the desired silanediol via hydrolysis with aqueous KOH. Efforts to apply this approach to biologically relevant silanediol peptide mimics, with a view to protease inhibition, are described.