Lithio Tris(methylthio)methane as Hydroxy/Thio/Aminocarbonyl Anion Equivalent: Asymmetric Synthesis of α‑Amino Acid Esters, Thioesters, Amides, and Peptides

The use of lithio tris(methylthio)methane as a hydroxy/thio/amino carbonyl anion equivalent in the synthesis of α-amino acids is reported. Addition of the reagent to nonracemic sulfinimines furnished the α-sulfinamido trithioformates in excellent diastereoselectivity. Unmasking the trithioformates to diverse functionalities, such as α-amino acid thioesters, esters, anilides, amides, and di/tri peptides, without epimerization of chiral centers was accomplished