Use of the SPhos ligand to suppress racemization in arylpinacolboronate ester Suzuki couplings involving α-amino acids. Synthesis of biaryl derivatives of 4-hydroxyphenylglycine, tyrosine, and tryptophan
(Chemical Equation Presented) α-Amino acid derivatives, particularly those of phenylglycine, can suffer significant racemization in Suzuki couplings. When arylpinacolboronate esters are used as coupling partners this unwanted side reaction can be suppress
Prieto, Monica,Mayor, Silvia,Lloyd-Williams, Paul,Giralt, Ernest