American Chemical Society, Journal of Organic Chemistry, 20(80), p. 9831-9837, 2015
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Total synthesis of the highly functionalized cyclic peptide natural product, ustiloxin D, has been achieved in a convergent manner. Our strategy incorporates an asymmetric allylic alkylation to construct the tertiary-alkyl-aryl ether linkage between the dopa and isoleucine residues. The elaborated beta-hydroxydopa derivative is rapidly converted to a linear tripeptide through an ammonia-Ugi reaction. Subsequent cyclisation and global deprotection affords ustiloxin D in six steps from a known beta-hydroxydopa derivative.