Synthesis of N-Protected Amino Sulfenyl Methyl Formamides and Sulfonyl Methyl Formamides: A Simple Protocol.

Chiral amino acid-derived formamides represent one of the most versatile components in multicomponent reactions. Herein, we describe a facile synthesis of N-protected amino sulfenyl methyl formamides and sulfonyl methyl formamides the Mannich reaction of N-protected amino alkyl thiols followed by oxidation using 3-chloroperbenzoic acid (-CPBA). This protocol is applicable to a wide range of Fmoc- and Cbz-protected amino acids. Notably, the reaction provides high yield and retains the stereochemistry of the chiral center of the starting component.