Fig. 6. Synthesis of UAAs (a) synthesis of unnatural chiral α-amino acid using visible-light assistance approach (b) light-mediated protocol for the synthesis of UAA via the radical decarboxylative process (c) synthesis of fluorescent α-amino acid 79 that emits greenish-blue light (d) synthesis of UAA precursor from diethyl acetamidomalonate 80 (e) synthetic route for various R-amino alcohols and R-amino acids using Pd-mediated Suzuki cross-coupling reaction. (f) Synthesis of enantiomerically enriched non-protein (S)-α-amino acid from Schiff base Ni(ii) complex 84 of the chiral auxiliary (S)-BPB. (g) Synthesis of unnatural aspartic and glutamic acid derivative 89.