A good "building blocks" search requires planning, modification, and repetition. Use a whiteboard, notebook, worksheet (.xlsx file), etc. as you design your search strategy.
amine functionalization [in some databases this could be 2 concepts: amine AND functionalization]
photoredox catalysis [in some databases this could be 2 concepts: photoredox AND catalysis, photocatalysis AND redox]
Check database Help screens for advice on advanced search techniques like
Find additional terms for concepts in your search. Look at…
Think about different perspectives on your topic:
Add the new terms to the concepts in your search and run your search again.