L-Tryptophan has been converted, by the alkylation of the hexahydro[2,3-b]pyrroloindole (7), followed by ring opening, to α-alkylated tryptophan derivatives with overall retention of configuration.
D. Crich and J. W. Davies, J. Chem. Soc., Chem. Commun., 1989, 1418 DOI: 10.1039/C39890001418
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