To diversify the types of radical precursors that can be coupled in a stereoselective manner, exploring alternative biocatalysts and photocatalysts can be beneficial. For biocatalysts, enzymes such as flavin-dependent monooxygenases or heme-containing proteins could be investigated for their potential in mediating oxidative coupling reactions. These enzymes may offer different selectivity profiles and reactivity towards a broader range of substrates, thus expanding the scope of non-canonical amino acid synthesis. In terms of photocatalysts, transition metal complexes or organic dyes with unique photophysical properties could be explored to enable the activation of different types of radical precursors under mild reaction conditions. By combining diverse biocatalysts and photocatalysts, new catalytic systems can be developed to achieve the stereoselective coupling of a wide variety of radical precursors for the synthesis of novel non-canonical amino acids.