Deep-Dive Guides · Alkaloids & Vitamins
Alkaloids & Vitamins — the complete deep dive
Two apparently unrelated topics share one theme: nitrogen and biosynthetic origin.
Free extract — the opening section of the guide, in full.
0. How to use this guide — nitrogen & origin
Two lenses carry the whole topic. For alkaloids, the lens is "what N-heterocycle, from which amino acid?" For vitamins, the lens is "fat- or water-soluble, and what coenzyme reaction?"
The three questions for any alkaloid: (1) What is the parent nitrogen ring? (pyridine, piperidine, tropane, quinoline, isoquinoline, indole, purine…). (2) Which amino acid is it biosynthetically derived from? (ornithine, lysine, tyrosine/phenylalanine, tryptophan, histidine, or — for pseudoalkaloids — a terpene/steroid + late-stage N). (3) Is the nitrogen in the ring (true alkaloid) or exocyclic (protoalkaloid)? Answer these and the family, properties, and even the likely biosynthesis follow.
The three questions for any vitamin: (1) Fat-soluble (A, D, E, K) or water-soluble (B-complex, C)? (2) What is its active/coenzyme form? (e.g. thiamine→TPP, riboflavin→FAD, niacin→NAD⁺, B6→PLP). (3) What reaction does that coenzyme run? (decarboxylation, redox/hydride, transamination, one-carbon transfer, carboxylation). Water-soluble vitamins are mostly coenzyme precursors; fat-soluble ones act more like hormones/antioxidants/cofactors.
Read the rest of this guide
The remaining 10 sections — Alkaloids — definition & classification, Key alkaloid families & structures, Alkaloid biosynthesis overview, Vitamins — classification and more — are part of ChemVidya Full Access, along with the other guides, the books, the study notes and 6,000+ practice questions with worked solutions.