Sulindac Impurity 13；68299-97-8
WhatsAPP: +86 17386083646
E-mail: anna@molcoo.com
Product Number: S037013
English Name: Sulindac Impurity 13
English Alias: 2-(5-fluoro-2-methyl-1H-inden-3-yl)acetic acid
CAS Number: 32004-66-3
Molecular Formula: C₁₂H₁₁FO₂
Molecular Weight: 206.21
As an impurity of Sulindac, this compound has the following advantages:
Well-defined with prominent core features: Contains an indene core, 5-fluoro substitution, methyl, and acetic acid side chain, differing from sulindac by lacking benzylidene double bond and methylsulfinyl group. Combined hydrophobicity of indene and polarity of carboxyl enable distinct retention behavior, allowing accurate identification via reversed-phase HPLC/LC-MS as a specific impurity marker;
High stability and traceability: Rigid indene structure and carboxyl stability ensure stability across wide pH ranges. As an intermediate from incomplete benzylidenation in sulindac synthesis, it directly reflects indene-benzaldehyde condensation efficiency, improving process tracing accuracy;
High detection sensitivity: UV absorption (230-250nm) from indene-carboxyl conjugation, combined with characteristic mass response (m/z 207 [M+H]⁺), enables trace analysis (ppb level) via LC-MS, compatible with indene-based NSAID core impurity systems.
Pharmaceutical quality control: Used as an impurity reference standard to quantify Sulindac Impurity 13 in APIs, ensuring residual unsubstituted indene intermediates meet quality standards post-benzylidenation/indene synthesis;
Synthesis optimization: Optimizing benzylidenation (catalyst dosage) by monitoring impurity levels to enhance indene-benzaldehyde condensation efficiency;
Intermediate purity assessment: Evaluating purity of key indene carboxylic acid intermediates in sulindac synthesis to support specificity of downstream benzylidenation/oxidation.
Sulindac synthesis requires indene construction, benzylidenation (double bond formation), and sulfide oxidation. Incomplete benzylidenation may generate uncondensed 5-fluoro-2-methylindene-3-acetic acid, known as Sulindac Impurity 13. Lacking the active benzylidene side chain, it has no anti-inflammatory activity, and its residue risks reducing sulindac purity, making control critical for quality assurance.
Current research focuses on:
Analytical method validation: Developing RP-HPLC assays with C18 columns for baseline separation, achieving 0.1 ppm quantitation limits via UV detection (240nm);
Condensation kinetics: Studying impurity formation under varying benzaldehyde concentrations to clarify indene-aldehyde reactivity;
Process refinement: Controlling impurity levels below 0.05% via optimized reactant ratios to enhance API purity;
Structural confirmation: Using ¹H-NMR and IR to verify indene/carboxyl structure, distinguishing from sulindac by double bond absence for impurity identification
We can also customize related analogues and modified peptides including HPLC, MS, 1H-NMR, MS, HPLC, IR, UV, COA, MSDS.
This product is intended for laboratory use only!
WhatsAPP: +86 17386083646
E-mail: anna@molcoo.com
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