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First, a 1,3-dipolar cycloaddition will be used to selectively combine the azide and alkyne functionalities of these tripeptides, thus generating the desired macrocyclic peptidomimetic architecture. Intramolecular cyclization reactions between amine and carbonyl moieties would then introduce the DKP motif into the macrocyclic framework.There are several key synthetic challenges associated with the proposed route. Two are particularly worthy of note. First, epimerization of the chiral centers needs to be avoided at all stages of the synthesis in order to obtain the products as single stereoisomers (and thus access the full matrix of stereochemical isomers in the library, i.e., maximizing stereochemical diversity). In addition, generation of both 1,4- and 1,5-subsituted triazoles from each tripetide derivative is desired so as to be able to access the desired scaffold diversity in the library; thus the 1,3-dipolar cycloaddition needs to operate in a highly controllable and regioselective fashion. |
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