Solid-phase synthesis of amino amides and peptide amides with unnatural side chains

Unnatural amino amides and peptide amides can be synthesized, using solid-phase chemistry, from glycine attached directly (or through an intervening peptide sequence) to a Rink resin. The glycine is converted to an activated benzophenone imine derivative, followed by C-alkylation and hydrolysis. This sequence provides a mild, high yielding route to Rink resin-bound racemic, unnatural, amino amides and di- and tripeptide amides. Cleavage with trifluoroacetic acid provides the final amide products in good yield and purity.