In Situ Quench Reactions of Enantioenriched Secondary Alkyllithium Reagents in Batch and Continuous Flow Using an I/Li‐Exchange
作者:Alexander Kremsmair、Henrik R. Wilke、Johannes H. Harenberg、Benjamin R. G. Bissinger、Matthias M. Simon、Nurtalya Alandini、Paul Knochel
DOI:10.1002/anie.202214377
日期:2023.1.2
In situ quench (ISQ) reactions of functionalized chiral secondary alkyl iodides in the presence of various electrophiles using t-BuLi provided optically enriched functionalized ketones, alcohols, amides, sulfides and boronic acid esters in 86–98 % ee. Performing these reactions in continuous flow allowed an easy scale-up and reaction temperatures of up to 0 °C.
Synthesis of Azide-Alkyne Fragments for “Click” Chemical Applications. Part 2. Formation of Oligomers from Orthogonally Protected Chiral Trialkylsilylhomopropargyl Azides and Homopropargyl Alcohols
作者:Oliver D. Montagnat、Guillaume Lessene、Andrew B. Hughes
DOI:10.1021/jo9021887
日期:2010.1.15
A small library of chiral, beta(3)-substituted homopropargyl alcohols and chiral beta(3)-substituted trimethylsilylhomopropargyl azides were generated starting from natural L-amino acids. The free alkynes and azides were then coupled, using a Huisgen 1,3-dipolar cycloaddition, to provide chiral oligomeric 1,4-disubstituted-1,2,3-triazoles as potential peptidomimetic compounds. The work is an extension to the previous synthesis of racemic, orthogonally protected 1,4-disubstituted-1,2,3-triazoles from the corresponding alpha-substituted propargyl alcohols and alpha-substituted trialkylsilylpropargyl azides.