Abstract
The spirobicyclic peptides 2−6 were synthesized as stereoisomeric pairs using an orthogonally protected bis(aminomethyl)malonic acid building block 1 as the branching unit. Peptide 2 was synthesized by two methods. Either the chain assembly and first cyclization were carried out on a Wang resin, and the second cyclization in solution (Scheme 1), or the whole synthesis was performed on a solid-supported backbone amide linker derived from 4-alkoxybenzaldehyde (Scheme 3). The applicability of the latter method was further evaluated by synthesis of four additional spirobicyclic peptides 3−6.
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