111991-20-9Relevant articles and documents
A method for preparing 2, 4, 5 - trifluorobenzene acetic acid (by machine translation)
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, (2018/12/03)
The invention discloses a 2, 4, 5 - trifluorobenzene acetic acid. The method includes the steps of: (1) the structure shown as formula A 2, 4, 5 - trifluorobenzene diazonium salt with the structure shown in formula II substituted ethylene to carry out coupling reaction, to obtain the intermediate; and (2) the intermediate through hydrolysis or oxidation of the structure is shown as formula I shown in 2, 4, 5 - trifluorobenzene acetic acid; the intermediate comprises a structure of formula IV or a compound represented by the structure of formula C shown 2, 4, 5 - trifluoro phenylacetaldehydes. (by machine translation)
A west he row sandbank and its salt synthesis method (by machine translation)
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Paragraph 0072; 0073, (2017/08/04)
The invention discloses a west he row sandbank and its salt synthesis method, in order to 2, 4, 5 - trifluorobenzene acetic acid as the starting material, through esterification, reduction, oxidation and Witting reaction, to obtain 4 - (2, 4, 5 - trifluorophenyl) - 2 - butene ethyl ester, or passes through the reduction, oxidation and Witting reaction after, to obtain 4 - (2, 4, 5 - trifluorophenyl) - 2 - butene ethyl ester. Then in BuLi or six methyl two silicon and nitrogen under the action of the alkane-sodium, with chiral amine on the hydroamination reaction, framed asymmetric amination product, through ester, condensation, hydrogenated three-step reaction to obtain sitagliptin. The west he of the spit of fland synthesis method of raw materials are cheap and easy to obtain, steps are less, the operation is easy, can be effectively reduced. The method can be the high purity of the sitagliptin, the salt of the phosphoric acid obtained after HPLC purity and sitagliptin ee values are in 99% or more, can be applied to the medical field. (by machine translation)
NOVEL BETA-SULFINAMINO MALONATE DERIVATIVES AND PROCESS FOR PREPARING THE SAME, AND PROCESS FOR PREPARING SITAGLIPTIN USING THE SAME
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Paragraph 0144-0146, (2021/06/22)
The present invention relates to beta-sulfinamino malonate derivatives having a high diastereomeric ratio (DR) value manufactured through a stereoselective addition reaction of chiral sulfinyl imine and malonate derivatives, to optically pure Sitagliptin by using the same, and to a method for manufacturing pharmaceutically acceptable salt thereof. According to the present invention, the method is capable of manufacturing novel beta-sulfinamino malonate derivatives which are intermediate in the manufacture of Sitagliptin, with high optical purity and high yields without using a solvent under mild conditions, and ultimately manufacturing optically pure Sitagliptin in an efficient manner by using the same.COPYRIGHT KIPO 2016