125971-95-1Relevant articles and documents
AN IMPROVED AND COMMERCIALLY VIABLE PROCESS FOR PREPARATION OF PYRROLE DERIVATIVES WITH IMPROVED IMPURITY PROFILE & MINIMISATION OF UNIT OPERATIONS.
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, (2020/02/14)
The present invention relates to improved process for the preparation of a pyrrole derivative as a racemic mixture, an enantiomer, a diastereoisomer, a mixture thereof, a tautomer thereof or a pharmaceutically acceptable salt and hydrates thereof and also intermediates involved therein. Particularly invention is directed to improved processes for the preparation of pyrrole derivatives such as (4R,cis)-6-[2-[3-phenyl-4-(phenyl-carbamoyl)-2-(4-fluorophenyl)-5-(1-methyl-ethyl)-pyrrole-1-yl]-2,2-dimethyl-[1,3]dioxane-4-yl-acetic acid-tertiary butyl ester of formula IV followed by its conversion into [R-(R*, R*]-2-(4-fluorophenyl)- β,δ-dihydroxy-5-(1-methylethyl)-3-phenyl-4-[(phenylamino)carbonyl]-1H-pyrrole-1- heptanoic acid particularly calcium salt and its hydrate represented by Formulae I/IA respectively wherein formation of the impurities is either eliminated or minimized in the corresponding intermediaries.
Atorvastatin calcium intermediate as well as preparation method and application thereof
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, (2019/04/04)
The invention discloses an atorvastatin calcium intermediate as well as a preparation method and application thereof. A synthesis process of the intermediate is environmentally-friendly, simple to operate and low in EHS risk; raw materials are easy to obtain; a used chemical reagent is small in toxicity and low in cost; and the synthesis process is a green synthesis process suitable for the industrial production. Moreover, the intermediate provided by the invention is applied to the synthesis of atorvastatin calcium and a key intermediate thereof, the route is relatively short, the yield is high, the industrial production cost of the atorvastatin calcium is effectively reduced, and the atorvastatin calcium intermediate has a relatively high industrial application prospect.
Separating method for impurity A and impurity B and method for effectively reducing content of impurity A in atorvastatin calcium condensate
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Paragraph 0071; 0072; 0073, (2019/01/16)
The invention discloses a separating method for an impurity A and an impurity B and a method for effectively reducing the content of an impurity A in an atorvastatin calcium condensate, and belongs tothe technical field of impurity separating in medicinal chemistry. The invention specifically discloses the impurity A in the atorvastatin calcium condensate, and a method for separating the impurityA from the atorvastatin calcium condensate, further studies that the impurity A of the atorvastatin calcium condensate is introduced by the impurity B in a starting material ATS-9 crude product, anddiscloses a method for separating the impurity B in the ATS-9 crude product, so as to reduce the content of impurity A in the atorvastatin calcium condensate, and further provide the basis for reducing the content of impurities in atorvastatin calcium diamine. The purity of the impurity A in the atorvastatin calcium condensate obtained by the separating method is at least 99.5%, and the purity ofthe impurity B in ATS-9 is at least 99.5%.