Abstract
Abstract The synthesis of methyl 8-tert-butyloxycarbonylamino-3-oxoindolizidine-2-carboxylate and its alkyl derivatives bearing Phe, Trp and Asp side chains at C2 position are described. These bridged bicyclic lactams, obtained with high and moderate stereocontrol at C8a and C2, respectively, have appropriate N- and C-protecting groups making them suitable for incorporation as spacers into higher peptides.
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