A5042497921- Crystallization and Solubility Studies
- Analytical Chemistry and Chromatography
- X-ray Diffraction in Crystallography
- Microfluidic and Capillary Electrophoresis Applications
- Chromatography in Natural Products
- Chemical Synthesis and Reactions
- Innovative Microfluidic and Catalytic Techniques Innovation
- Crystallography and molecular interactions
- Advanced Chemical Sensor Technologies
- Drug Solubulity and Delivery Systems
- Microfluidic and Bio-sensing Technologies
- Carbohydrate Chemistry and Synthesis
- Antimicrobial agents and applications
- HIV/AIDS drug development and treatment
- Chronic Lymphocytic Leukemia Research
- Analytical Methods in Pharmaceuticals
- Thermodynamic properties of mixtures
- Thermal and Kinetic Analysis
- Coordination Chemistry and Organometallics
- Pesticide Exposure and Toxicity
- Chemical Thermodynamics and Molecular Structure
- Ionic liquids properties and applications
- Spectroscopy and Quantum Chemical Studies
- Synthesis of Organic Compounds
- Asymmetric Synthesis and Catalysis
Merck & Co., Inc., Rahway, NJ, USA (United States)
2012-2024
University of Minnesota
2005-2011
Minneapolis College
2007
A streamlined methodology for cocrystal screening and scale-up has been developed. There are two parts to this procedure: (1) a high throughput approach the rapid identification of potential leads (2) new procedure solvent selection, rapidly mapping critical region in ternary phase diagram, determining cocrystallization scale-up. Using approach, we have discovered scaled-up forms pharmaceutically active compound 1 treatment type II diabetes. This provided more than 2 g material suitable...
A robust, green, and sustainable manufacturing process has been developed for the synthesis of gefapixant citrate, a P2X3 receptor antagonist that is under investigation treatment refractory unexplained chronic cough. The newly commercial features low mass intensity (PMI), short synthetic sequence, high overall yield, minimal environmental impact, significantly reduced API costs. key innovations are implementation highly efficient two-step methoxyphenol synthesis, an innovative pyrimidine in...
Infrared (IR), Raman, and nuclear magnetic resonance (NMR) spectroscopic techniques were used to investigate the nature of molecular aggregation indomethacin (I) in acetonitrile ethanol solutions. Spectroscopic data provided no evidence for self-aggregation I supersaturated solutions or ethanol. As concentration was increased by more than 130 fold, from 5 × 10–4 0.067 M acetonitrile, diffusion coefficients water (residual) measured pulse field gradient spin echo (PFGSE-NMR) showed a decrease...
The crystal structure of the title compound, C15H14N2O·CF3CH2OH, which is 2,2,2-trifluoroethanol (TFE) solvate 5H-dibenzo[b,f]azepine-5-carboxamide (carbamazepine, CBZ), reported. asymmetric unit consists two independent molecules each component, CBZ and TFE.
The manufacturing route toward gefapixant citrate generates a trace amount of cyanide as byproduct reaction employing the reagent chloroacetonitrile. In development control strategy, conventional process and analytical approaches fell short because challenges incompatibilities with matrices waste streams. To overcome these, we identified adapted specific procedures for control. Our strategy ensured safety patients, operators, management.
Sulfonamidation is the pre-penultimate step in commercial synthesis of gefapixant citrate. Several stress studies were performed during process characterization this to ensure robustness and mitigate potential upset scenarios. One parameter explored was slow addition chlorosulfonic acid (CSA) form sulfonic intermediate. During extended addition, an unexpected series precipitation–dissolution events observed. To better understand these accommodate a CSA tank switch reaction, detailed...
Abstract Selection of column and mobile phase eluent/buffer is a crucial step in chromatographic method development. The introduction new technologies requires continuous performance evaluation enabling the deployment improved screening workflows. Consequently, development universal that could be used across different chemistries pH ranges would highlighted as advantageous. Herein, we introduce single generic probe developed via software‐based modeling delivers excellent results for...
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Current methods of milling an active pharmaceutical ingredient (API) often suffer from limited control over particle size and solid-state form or require large amounts material for optimization, rendering them unsuitable use in early discovery efforts. We here develop operating workflows acoustic-vibratory technique, which enables both materials-sparing screens scaled-up production micro/nanosuspensions with well-defined tunable distributions. Workflows are based on the generation guidance...
Ion Chromatography (IC) is one of the most widely used methods for analyzing ionic species in pharmaceutical samples. A universal IC method that can separate a wide range different analytes highly desired as it save lot time development and validation processes. Herein we report anions active ingredients (APIs) using computer-assisted chromatography modeling tools. While tools such ACD Labs/LC Simulator have been to assist scientists with reverse phase development, application these rare. We...
Control of process impurities is critical to ensure a robust and quality drug substance. During the commercial development for Gefapixant Citrate substance, several significant were found derive from sulfuryl chloride, an impurity in key raw material, chlorosulfonic acid (CSA). This made controlling CSA essential production this Direct analysis methods evaluated unsuitable because highly reactive nature chloride CSA. A derivatization reversed-phase high performance liquid chromatography...