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3-Chloroaniline, with chlorine substituted at the meta position of the aniline ring (C₆H₆ClN), is a fundamental aromatic amine building block in organic synthesis. The meta relationship between the electron-withdrawing chlorine substituent and the electron-donating amino group creates a distinct electronic asymmetry that significantly influences the molecule‘s reactivity and substitution patterns — an effect not observed in its ortho and para isomers. This meta-substitution pattern lowers the electron density at the ortho and para positions relative to the amine group, suppressing unwanted side reactions while preserving the nucleophilicity of the amino group for subsequent functionalization. The molecule’s unique combination of moderate polarity (logP ~0.77–2.03), high thermal stability (boiling point 230–231°C) and a reactive primary amine enables it to serve as a versatile electrophile — through diazonium salt formation — and nucleophile — through amide or urea bond formation — all within a single synthetic workflow.

tert-Butyl (S)-2-(4-fluoro-3,5-dimethylphenyl)-4-methyl-3-(2-oxo-2,3-dihydro-1H-imidazol-1-yl)-2,4,6,7-tetrahydro-5H-pyrazolo[4,3-c]pyridine-5-carboxylate is a stereochemically complex pyrazolopyridine derivative featuring a (4S)-configured chiral center at the tetrahydropyridine ring junction, a 4-fluoro-3,5-dimethylphenyl group at the 2-position, and a 2-oxo-2,3-dihydro-1H-imidazol-1-yl moiety at the 3-position, with the entire core rigidified by the fused bicyclic pyrazolo[4,3-c]pyridine scaffold. This intricate molecular architecture, incorporating a fluorinated diaryl unit, a conformationally constrained heterocyclic core, and a tert-butyl carbamate (Boc) protecting group, is precisely engineered to enable the assembly of next‑generation non‑peptide GLP‑1 receptor agonists with optimized pharmacokinetic profiles.

tert-Butyl (S)-3-amino-2-(4-fluoro-3,5-dimethylphenyl)-4-methyl-2,4,6,7-tetrahydro-5H-pyrazolo[4,3-c]pyridine-5-carboxylate is a chiral pyrazolopyridine derivative with a specific (4S)-configuration at the fused-ring junction, featuring a fluorinated diaryl moiety and a Boc-protected amine. The rigid, sp³-rich bicyclic framework integrates a conformationally restricted pyrazolo[4,3-c]pyridine core with a strategically placed fluorine atom and two methyl groups, which collectively fine-tune the scaffold’s metabolic stability, lipophilicity, and target engagement profile, making it an essential structural motif in modern GLP-1 receptor agonist design and development.

The compound tert-butyl 4-((2S,5R)-5-((benzyloxy)amino)piperidine-2-carboxamido)piperidine-1-carboxylate (CAS 1510832-19-5) features a complex, stereochemically defined architecture built around two piperidine rings connected via a carboxamide linkage. The central piperidine-2-carboxamide unit carries two chiral centers at the 2S and 5R positions, which are critical for the eventual biological activity of diazabicyclooctane β‑lactamase inhibitors. At the 5‑position, a benzyloxyamino (–O–NH–Bn) group serves as a protected hydroxylamine, a versatile handle for later cyclization or functionalization. The carboxamide nitrogen is attached to a second piperidine ring whose distal nitrogen is protected by a tert‑butoxycarbonyl (Boc) group, offering orthogonal deprotection selectivity. This precise stereochemical arrangement and orthogonal protecting group strategy make tert-butyl 4-((2S,5R)-5-((benzyloxy)amino)piperidine-2-carboxamido)piperidine-1-carboxylate an indispensable building block in the synthesis of advanced β‑lactamase inhibitors such as avibactam and relebactam.

Avibactam Impurity 5, chemically (2S,5R)-5-((benzyloxy)amino)piperidine-2-carboxylic acid, is a chiral piperidine-based carboxylic acid that serves as a key process-related impurity and a critical synthetic intermediate for the blockbuster β‑lactamase inhibitor Avibactam. The molecule features a stereochemically defined (2S,5R) configuration, a free carboxylic acid group at the 2-position, and a benzyloxyamino substituent at the 5-position of the piperidine ring. This precise stereochemical architecture positions Avibactam Impurity 5 as an essential reference standard for pharmaceutical quality control and a valuable building block in the development of next‑generation diazabicyclooctane (DBO) β‑lactamase inhibitors.

Avibactam INT 1, chemically named (2S,5R)-5-((benzyloxy)amino)piperidine-2-carboxylic acid ethyl ester oxalate, is a chiral piperidine derivative featuring a stereochemically defined (2S,5R)-configured piperidine core, a benzyloxyamino substituent at the 5-position, an ethyl carboxylate at the 2-position, and an oxalate counterion. This precise dual-stereocenter architecture, combined with the oxalate salt form, renders Avibactam INT 1 not only a key synthetic intermediate but also a critical impurity reference standard for the manufacture of the blockbuster β‑lactamase inhibitor Avibactam, positioning it as an indispensable building block in the fight against multidrug‑resistant Gram‑negative bacterial infections.