Synthesis-Strategies
Asymmetric Synthesis
Asymmetric synthesis produces one enantiomer preferentially using chiral catalysts, auxiliaries, or reagents. It is essential for pharmaceutical and natural product synthesis.
Biocatalysis
Biocatalysis uses enzymes and whole cells for chemical transformations. It offers exceptional selectivity under mild, aqueous conditions.
C–H Functionalization
C–H functionalization directly converts C–H bonds to C–C or C–heteroatom bonds without pre-functionalization. It is the ultimate goal of atom-economical synthesis.
Cascade / Domino Reactions
Cascade reactions perform multiple bond-forming events in a single operation without isolating intermediates. They maximize atom economy and step efficiency.
Convergent Synthesis
Convergent synthesis combines two or more fragments in the final steps, as opposed to linear synthesis. It gives higher overall yields and is more efficient for large molecules.
Dynamic Kinetic Resolution (DKR)
DKR combines kinetic resolution with in-situ racemization to convert a racemic mixture to a single enantiomer in up to 100% yield.
Electrochemical Synthesis
Electrochemistry uses electrical current to drive redox reactions without chemical oxidants or reagents. It is a green and selective approach to oxidation and reduction.
Flow Chemistry
Flow chemistry performs reactions in continuous-flow reactors rather than batch. It offers better heat/mass transfer, safety, and scalability for hazardous reactions.
Late-Stage Functionalization
Late-stage functionalization modifies complex molecules at a late stage, enabling rapid analog synthesis for drug discovery and SAR studies.
Mechanochemistry
Mechanochemistry performs reactions by grinding or milling solid reactants without solvent. It is environmentally friendly and can access unique reactivity.
Microwave-Assisted Synthesis
Microwave irradiation accelerates chemical reactions by direct heating. It reduces reaction times from hours to minutes and often improves yields.
Multicomponent Reactions (MCRs)
Multicomponent reactions combine three or more starting materials in a single step to form products incorporating most of the atoms. Ugi, Passerini, and Mannich are key examples.
Photochemical Synthesis
Photochemistry uses light to activate molecules, enabling reactions inaccessible by thermal pathways. Photoredox catalysis has revolutionized modern organic synthesis.
Protection–Deprotection Strategies
Protecting groups mask reactive functional groups during synthesis. Common protecting groups include silyl ethers (TBDMS, TMS), acetals, carbamates (Boc, Cbz, Fmoc), and esters.
Retrosynthetic Analysis
Retrosynthetic analysis is the logical disconnection of a target molecule into simpler precursors. Developed by Corey (Nobel 1990), it is the primary planning tool for synthesis.
Solid-Phase Synthesis
Solid-phase synthesis attaches building blocks to a polymer support, enabling easy purification by filtration. It is the basis of peptide and oligonucleotide synthesis.
Telescoped (One-Pot) Synthesis
Telescoped synthesis performs multiple reaction steps in a single vessel without isolating intermediates. It reduces waste, time, and solvent usage.
Total Synthesis
Total synthesis constructs complex natural products entirely from commercial or simple starting materials. It demonstrates the power and creativity of organic chemistry.
Understanding Catalytic Cycles
Catalytic cycles describe the regeneration of catalysts through mechanistic steps. Understanding these cycles is essential for optimizing reactions and developing new catalysts.