Synthesis of terminally protected 9-amino-4,5-diazafluorene-9-carboxylic acid, the first rigid, transition-metal receptor, C(α,α)-disubstituted glycine

Article abstract of DOI:10.1016/S0040-4039(99)01295-2

N-tert-Butyloxycarbonyl-9-amino-4,5-diazafluorene-9-carboxylic acid methyl ester, Boc-Daf-OMe, the first C(α,α)-disubstituted glycine containing a rigid bipyridine ligand in a totally controlled spatial situation relative to the C(α) atom of the amino aci