Organic Synthesis
Organic synthesis is the design and execution of sequences of reactions to construct target molecules, from simple compounds to the most complex natural products and pharmaceuticals.
Definition
Organic synthesis is the branch of organic chemistry concerned with planning and carrying out the stepwise construction of organic molecules from simpler precursors.
Scope
This area covers retrosynthetic analysis and synthetic strategy, methods of carbon–carbon bond formation, protecting-group chemistry and functional-group interconversion, control of chemo-, regio-, and stereoselectivity, and the principles of asymmetric synthesis.
Sub-topics
Core questions
- How is a complex target molecule disassembled into available starting materials?
- What reactions reliably form carbon–carbon and carbon–heteroatom bonds?
- How are selectivity and stereochemistry controlled across a multistep route?
Key theories
- Retrosynthetic analysis
- Targets are analyzed backward by breaking strategic bonds (disconnections) to reveal simpler precursors (synthons), formalized by Corey into a systematic planning logic.
- Selectivity in synthesis
- Successful synthesis requires controlling chemoselectivity, regioselectivity, and stereoselectivity at each step, often through reagent choice, protecting groups, and catalysts.
Mechanisms
Synthetic planning rests on the reliable mechanisms of the underlying reactions — substitution, addition, condensation, cycloaddition, and catalysis — combined into routes that balance step count, yield, and selectivity. Strategy involves choosing convergent over linear sequences and minimizing protecting-group manipulations.
Clinical relevance
Organic synthesis supplies the world's pharmaceuticals, from small-molecule drugs to complex natural products; advances in synthetic methodology directly expand the range of accessible, affordable medicines and enable medicinal-chemistry optimization of drug candidates.
History
From Wöhler's 1828 synthesis of urea, organic synthesis matured through Woodward's mid-century total syntheses and Corey's formalization of retrosynthetic analysis (recognized by the 1990 Nobel Prize), establishing synthesis as a rigorous, strategic discipline.
Key figures
- Robert Burns Woodward
- Elias James Corey
- Stuart Warren
Related topics
Seminal works
- warrenwyatt2008
- careysundberg2007b
Frequently asked questions
- What is the difference between a synthon and a reagent?
- A synthon is an idealized fragment, often a charged species, that represents a bond-forming role in retrosynthetic analysis; a reagent is the real, available compound that supplies that synthon in the actual reaction.
- Why are convergent syntheses preferred?
- In a convergent synthesis large fragments are made separately and joined late, so material losses are spread across branches rather than compounded in one long linear chain, giving higher overall yields for complex targets.