The chemical reactions and pathways resulting in the formation of alkaloids, nitrogen-containing natural products which are not otherwise classified as nonprotein amino acids, amines, peptides, amines, cyanogenic glycosides, glucosinolates, cofactors, phytohormones, or primary metabolite (such as purine or pyrimidine bases). [ GOC:lr https://www.worldcat.org/search?q=bn%3A0122146743 ]
Synonyms: alkaloid synthesis alkaloid biosynthesis alkaloid anabolism alkaloid formation