957059-61-9Relevant academic research and scientific papers
Development and Process Intensification of an Efficient Flow-Cascade Reaction Sequence in the Synthesis of Afizagabar
Farkas, Ferenc,Kátai-Fadgyas, Katalin,Mengyel, Béla,Nagy, Tamás,Peth?, Bálint,Szilágyi, Gábor B.,Volk, Balázs
supporting information, (2022/03/17)
Aromatic nitration and catalytic hydrogenation are among the most dangerous reactions in the chemical industry. The traditional, batchwise pilot plant manufacturing process of a key intermediate of our drug candidate afizagabar (S44819) involved these kinds of transformations (besides a Dakin-West-type reaction, a ring closure, and a keto reduction step). To mitigate some of the hazards associated with this sequence, a flow chemical approach was developed. First, a flow-cascade process was elaborated, which furnished the product with a throughput of 1.52 g/h with an HPLC purity of 95.6%. The bottleneck of the procedure in terms of output was the heterogeneous catalytic hydrogenation; therefore, our subsequent process intensification efforts primarily concentrated on this step. Finally, application of higher concentrations and an upscaled hydrogenation reactor combined with the corresponding adjustment of parameters of further reaction steps resulted in an efficient process with an effective product yield of 11.95 g/h and an increased HPLC purity (97.1%). The 4-step uninterrupted process described here is based on a newly developed heterogeneous flow reactor system and a custom-made liquid-liquid extractor, providing an instructive case study on handling hazardous processes in a safe and efficient way.
COLD MENTHOL RECEPTOR-1 ANTAGONISTS
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Page/Page column 71-72, (2012/03/12)
The invention is directed to TRPM8 antagonists of Formula (I). More specifically, the present invention relates to certain novel compounds, methods for preparing compounds, compositions, intermediates and derivatives thereof and methods for treating TRPM8-mediated disorders. Pharmaceutical and veterinary compositions and methods of treating pain and various other disease states or conditions using compounds of the invention are also described.
COLD MENTHOL RECEPTOR-1 ANTAGONISTS
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Page/Page column 71, (2012/07/28)
The invention is directed to TRPM8 antagonists of Formula (I). More specifically, the present invention relates to certain novel compounds, methods for preparing compounds, compositions, intermediates and derivatives thereof and methods for treating TRPM8-mediated disorders. Pharmaceutical and veterinary compositions and methods of treating pain and various other disease states or conditions using compounds of the invention are also described.
COLD MENTHOL RECEPTOR-1 ANTAGONISTS
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Page/Page column 216, (2008/06/13)
The invention is directed to TRPM8 antagonists of Formula (I). More specifically, the present invention relates to certain novel compounds, methods for preparing compounds, compositions, intermediates and derivatives thereof and methods for treating TRPM8-mediated disorders. Pharmaceutical and veterinary compositions and methods of treating pain and various other disease states or conditions using compounds of the invention are also described.
