No abstract

An improved process for the synthesis of antidiabetic drug trelagliptin succinate through unprotected (R)-3aminopiperidine was described. The impurity profile with different conditions of the key substitution was illustrated, and then the best reaction condition was identified. The optimizations also included the bromination of 4-fluoro-2-methylbenzonitrile so that the process became efficient and concise.

An improved process of the novel HMG CoA reductase inhibitor SIPI-4884 has been developed for early preclinical pharmacology and safety studies, and it was made up with an efficient nine-step and scalable process. Significant improvements in the nucleophilic substitution, reduction, Wittig−Horner reaction, and preparation of calcium salt were demonstrated. The overall yield was improved to 17.2%.

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A series of calcium (3R,5S,6E)-7-[4,6,7,8-substituted-quinoline-3-yl]-3,5-dihydroxy-hept-6-enoates was synthesized from the lactones, and the anti-hypercholesterolemic evaluation in quails was presented in this report. It was found that most of the compounds significantly decreased levels of total cholesterol and low-density lipoprotein. 2e showed better hypolipidemic effect than atorvastatin, and 2d and 2j exhibited comparable efficacy to atorvastatin. These three compounds were selected as the hypocholesterolemic candidates for further evaluation.