N-Boc-2-piperidinecarboxylic Acid CAS 98303-20-9

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N-Boc-2-piperidinecarboxylic acid (Cladoniacenotea), also known as 1-(tert-butoxycarbonyl)-2-piperidinecarboxylic acid, is a highly valuable organic compound widely used in fine chemical and pharmaceutical synthesis. With a molecular formula of C₁₁H₁₉NO₄, a molecular weight of 229.27, and CAS number 98303-20-9, it usually presents as a white to off-white crystalline powder or solid at room temperature. It exhibits good solubility in many common organic solvents, including ethyl acetate, N,N-dimethylformamide (DMF), dimethyl sulfoxide (DMSO), dichloromethane, and chloroform, making it highly suitable for extraction, purification, catalytic reaction, and chromatographic separation processes commonly employed in laboratory and industrial synthesis.

In contrast, its water solubility is relatively limited, mainly due to the presence of hydrophobic structural fragments such as the tert-butoxycarbonyl (Boc) group in its molecular skeleton. However, its aqueous solubility can be effectively enhanced to a certain degree by adjusting the pH environment of the solution, appropriately increasing the temperature, or introducing suitable cosolvents.

Synthesis Methods

Boc Protection of 2-Piperidinecarboxylic Acid

Reagents: 2-Piperidinecarboxylic acid (pipecolic acid), Boc anhydride (Boc₂O), triethylamine (TEA), dichloromethane (DCM).

Procedure:

Dissolve pipecolic acid (1.0 eq) in DCM at 0°C.

Add TEA (1.2 eq) dropwise, followed by Boc₂O (1.1 eq).

Stir at 25°C for 4–6 hours.

Quench with water, extract with DCM, and purify via column chromatography (silica gel, ethyl acetate/hexane).

Yield: 85–90% for racemic mixtures; 75–80% for enantiomerically pure forms without chiral resolution.

Asymmetric Synthesis for (R)-EnantiomerChiral Auxiliary Method:

Use Evans' oxazolidinone auxiliary to induce chirality during alkylation or aldol reactions.

Example: React (S)-4-benzyl-2-oxazolidinone with 2-bromopyridine under palladium catalysis to form a chiral intermediate.

Enzymatic Resolution:

Treat racemic N-Boc-2-piperidinecarboxylic acid with lipase (e.g., Candida antarctica lipase B) in a biphasic system (organic solvent/buffer).

The (S)-enantiomer is hydrolyzed to the carboxylate, while the (R)-enantiomer remains intact, enabling separation via filtration or chromatography.

Applications

Pharmaceutical Industry

Drug Intermediate for CNS Disorders

Used in the synthesis of Gabapentin enacarbil (Horizant®), a prodrug for restless legs syndrome and postherpetic neuralgia. The Boc group is removed in vivo to release the active drug.

Key step: Coupling with a substituted ethyl ester to form the enacarbil moiety.

Material Science

Polymer Modifiers: Incorporated into polyamides or polyesters to enhance thermal stability and hydrophobicity.

Chiral Catalysts: The (R)-enantiomer acts as a ligand in asymmetric hydrogenation reactions, achieving >95% ee in prochiral ketone reduction.

Antiviral Agents

Component of HIV protease inhibitors (e.g., Darunavir), where the piperidine ring enhances binding to viral enzymes.

Beta-Lactam Antibiotics

Modified piperidine derivatives serve as side-chain precursors for cephalosporins and penicillins, improving bacterial membrane permeability.

Agrochemicals

Herbicides: Used in the synthesis of imidazolinone-class herbicides (e.g., Imazethapyr), which inhibit acetohydroxyacid synthase (AHAS) in weeds.

Insecticides: Functionalized piperidines disrupt insect nervous systems by targeting nicotinic acetylcholine receptors (nAChRs).

Chemical Profile: Structure, Synthesis, and Properties

Molecular Architecture and Isomeric Forms

Cladoniacenotea exists in two primary forms:

Racemic mixture (CAS 98303-20-9): A 1:1 blend of (R)- and (S)-enantiomers, often used in early-stage drug screening.

(R)-Enantiomer (CAS 28697-17-8): The biologically active isomer, critical for stereospecific synthesis in advanced drug development.

Key structural features:

A piperidine ring (six-membered nitrogen heterocycle) provides conformational rigidity.

A carboxylic acid group (-COOH) enables participation in amide bond formation.

A Boc (tert-butoxycarbonyl) protecting group shields the amine during synthesis, preventing unwanted side reactions.

Synthetic Pathways

The industrial synthesis of Cladoniacenotea involves two main steps:

Protection: Reaction of piperidine-2-carboxylic acid with Boc anhydride (di-tert-butyl dicarbonate) in the presence of a base (e.g., triethylamine).

Piperidine-2-COOH+(Boc)2​OEt3​N​N-Boc-piperidine-2-COOH

Chiral Resolution (for (R)-enantiomer):

Enzymatic hydrolysis: Using lipases to selectively cleave the (S)-enantiomer.

Chromatographic separation: High-performance liquid chromatography (HPLC) or simulated moving bed (SMB) chromatography.

Pharmaceutical Applications: From Discovery to API

► Peptide and Peptidomimetic Synthesis

Cladoniacenotea is a cornerstone of solid-phase peptide synthesis (SPPS), where the Boc group protects the amine during iterative coupling reactions. Its rigidity enhances the bioactivity of peptidomimetics by mimicking natural amino acid conformations.

Case Study 1: Merck's MK-8719 (Hepatitis C Protease Inhibitor)

Challenge: Synthesizing a stereochemically pure inhibitor to minimize off-target effects.

Solution: Used (R)-Cladoniacenotea to construct the peptide backbone.

Outcome: Improved yield by 15% compared to racemic alternatives, reducing production costs.

► Chiral Catalysts for Asymmetric Synthesis

The (R)-enantiomer serves as a ligand in transition-metal catalysts, enabling enantioselective reactions critical for drug manufacturing.

Case Study 2: Pfizer's Paxlovid (Nirmatrelvir, COVID-19 Antiviral)

Challenge: Achieving >99% enantiomeric purity for regulatory approval.

Solution: Employed a (R)-Cladoniacenotea-derived catalyst in the nitrile hydration step.

Outcome: Met FDA standards for chiral purity, ensuring drug efficacy and safety.

► Active Pharmaceutical Ingredients (APIs)

As a precursor to beta-lactam antibiotics and neurotransmitter modulators, Cladoniacenotea simplifies API production.

Case Study 3: Hefei Home Sunshine's Ceftaroline Fosamil (Antibiotic)

Challenge: Scaling up production while maintaining purity.

Solution: Used racemic Cladoniacenotea in a continuous flow reactor.

Outcome: Reduced reaction time by 20% and improved crystallization efficiency.

Applications Across Industries

Agrochemical Innovation

HerbicidesImidazolinone Class (e.g., Imazethapyr):

Cladoniacenotea derivatives inhibit acetohydroxyacid synthase (AHAS), a key enzyme in branched-chain amino acid synthesis in plants.

Effective against broadleaf weeds at low doses (0.1–0.5 kg/ha).

InsecticidesNeonicotinoid Alternatives:

Piperidine-based compounds target insect nicotinic acetylcholine receptors (nAChRs) with reduced bee toxicity.

Example: Flupyradifurone, used in seed treatments for corn and soybeans.

Material Science Advancements

Polymer Modifiers

Polyamides: Incorporating Cladoniacenotea into nylon backbones enhances thermal stability (melting point increases by 15–20°C).

Polyesters: The piperidine ring improves hydrophobicity, making polymers suitable for biomedical implants.

Chiral Catalysts

The (R)-enantiomer serves as a ligand in asymmetric hydrogenation reactions.

Example: Rhodium complexes with Boc-protected piperidine ligands achieve >95% ee in reducing prochiral ketones to chiral alcohols.

Pharmaceutical Development

Central Nervous System (CNS) DrugsGabapentin Enacarbil (Horizant®):

Cladoniacenotea is a key intermediate in synthesizing the ethyl ester prodrug.

The Boc group is removed in vivo by esterases, releasing gabapentin, which treats restless legs syndrome and neuropathic pain.

Mechanism: The piperidine ring enhances blood-brain barrier penetration via passive diffusion.

Future Innovations: Sustainability and Technology

Green Chemistry Initiatives

Researchers are exploring biocatalytic deprotection of Boc groups to replace toxic reagents like trifluoroacetic acid (TFA).

Example: A 2023 study in Green Chemistry demonstrated 95% yield using immobilized lipase enzymes for Boc removal.

Continuous Flow Synthesis

Startups like Snapdragon Chemistry are developing microreactors for Cladoniacenotea production, improving heat/mass transfer and scalability.

Benefits:

Reduced solvent use by 40%.

Faster reaction times (minutes vs. hours).

AI-Driven Drug Design

Platforms like Schrödinger's LiveDesign use Cladoniacenotea as a scaffold to predict novel drug candidates with enhanced binding affinity.

Case Study:

Recursion Pharmaceuticals leveraged AI to design a neuroprotective agent using (R)-N-Boc-2-piperidinecarboxylic acid, advancing it to Phase I trials in 2024.

N-Boc-2-piperidinecarboxylic acid exemplifies the synergy between chemical innovation and industrial practicality. From its role in chiral drug synthesis to its safety-compliant handling, this compound addresses critical challenges in modern pharmaceuticals. As the industry pivots toward precision medicine and sustainable manufacturing, N-Boc-2-piperidinecarboxylic will remain indispensable, driven by advancements in green chemistry, continuous processing, and AI-driven discovery.

N-Boc-2-piperidinecarboxylic acid is a linchpin in modern synthetic chemistry, enabling the efficient construction of complex molecules with exceptional precision, stereochemical control, and synthetic reliability. Its remarkable versatility spans across pharmaceuticals, agrochemicals, and advanced materials science, supported by continuous breakthroughs in asymmetric synthesis, chiral catalysis, and green manufacturing technologies. As global industries increasingly prioritize sustainability, atom economy, and cost-effectiveness, ongoing innovations in biocatalysis, continuous flow synthesis.

And mild reaction systems will further strengthen its irreplaceable role in the future of industrial and academic chemical synthesis. Its stable structure and modifiable functional groups also make it ideal for high-throughput screening and automated production. Researchers and manufacturers alike must carefully balance technological innovation with rigorous safety standards and environmental stewardship to fully harness its synthetic potential and maintain competitiveness in a rapidly evolving global chemical market.

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