When R3 contains R7 where R7 is 1-unsubstituted-2- or 3-indolyl (Scheme IIId), the compounds 24 may be further alkylated by treatment with sodium hydride followed by an alkyl halide or an acrylate, such as methyl or ethyl acrylate or acrylonitrile, or an activated amino acid such as Boc-phenylalanine anhydride to give the corresponding 1-substituted indole compounds 24 (Scheme IIId) in which R8 is