cas 3964-81-6, AzatadineMaleate | Articles data ｜lookchem

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3964-81-6

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Preparation method of loratadine impurity
The invention provides a preparation method of a loratadine impurity. The method comprises the following steps: dissolving methylloratadine in a solvent, adding an acid and a catalyst into the solution, heating the solution in a hydrogen atmosphere for a heating reaction, and carrying out cooling, filtering, concentrating and purifying to obtain the loratadine impurity represented by the formula II. According to the technical scheme, the raw materials are cheap and easily available, the operation and post-treatment are simple, the reaction conditions are mild, the process is stable, the yieldis high, and the reproducibility is good. According to the technical scheme, the blank that no loratadine impurity preparation method exists in China is filled up, the cost of developing the medicineby pharmaceutical enterprises can be reduced, and the preparation method has a very good industrial application prospect.
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Paragraph 0029-0052

(2020/03/14)

Dual Antagonists of Platelet Activating Factor and Histamine. Identification of Structural Requirements for Dual Activity of N-Acyl-4-(5,6-dihydro-11H-benzocycloheptapyridin-11-ylidene)piperidines
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Piwinski, John J.,Wong, Jesse K.,Green, Michael J.,Ganguly, Ashit K.,Billah, M. Motasim,et al.
p. 457 - 461
(2007/10/02)

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Chemical Properties

Appearance/Colour :White or off-white crystalline powder
Melting Point: 124-126ºC
Boiling Point: 450.1 °C at 760 mmHg
Flash Point:226 °C
Density: 1.127 g/cm³
PKA: 8.74±0.20(Predicted)
PSA: 16.13000
LogP: 3.64560

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