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Sunday 15 November 2015

Analytical Characterization of new related impurities of Diltiazem, DTZ II (B)




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NOTE DTZ (A) IS DILTIAZEM AND OTHER TWO ARE IMPURITIES


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Structure elucidation of DTZ-II impurity In the positive mass spectra, the protonated [M+H]+ molecular ion was detected at m/z 370.1. The even m/z number of [M+H]+ ions suggest that DTZ-II contains odd number of nitrogen atoms (nitrogen rule). From these results the molecular ion of DTZ-II was found to be at m/z 369. The mass difference between Diltiazem and DTZ-II was found to be 45 amu less. The positive HR-MS spectrum showed protonated molecular ion at m/z 370.1131 corresponding to molecular formula C20H20NO4S. When compared with the molecular formula of Diltiazem, there was a difference of C2H7N. The difference can be rationalized in terms of the loss of trimethyl amine moiety. The presence of additional aromatic signal at δ 7.55 ppm in 1H NMR (Figure 9) and corresponding carbon signal at 131.741 ppm in 13C NMR (Figure 10). The correlation between the carbon and proton clearly observed in HSQC (Figure 11) and one methylene signal was observed in HSQC. The methylene proton at δ 4.38 and 4.71 ppm in 1H NMR corresponding carbon signal at 99.41 ppm in 13C NMR. The aromatic methine proton at δ 7.55 ppm showed HMBC (Figure 12) correlations for carbon C5 and C7 positions at 140.808 and 165.121 ppm respectively (Figure 7). The aromatic methine proton at δ 7.55 ppm showed correlation with methylene proton at δ 4.38 and 4.71 ppm in COSY (Figure 13). NMR assignments are shown in Table 1. The above spectral data supports the assigned structure as 2-(4-methoxyphenyl)-4-oxo-5-vinyl-2,3,4,5-tetrahydrobenzo[b][1,4]thiazepin-3-yl acetate (DTZ-II).

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FOLLOW OTHERS IN .........http://www.orientjchem.org/vol31no3/analytical-characterization-of-two-new-related-impurities-of-diltiazem-by-high-resolution-mass-spectrometry-and-nmr-techniques/

Analytical Characterization of two new related impurities of Diltiazem by High Resolution Mass spectrometry and NMR techniques096

Jagadeesh Narkedimilli1,2,*, Y. Ravindrakumar1 ,Sandeep Mohanty1, T. Srinivasarao1, A. Jayashree2
1Dr. Reddy’s Laboratories Limited, API Plant-III, Medak District, Hyderabad 500072, Telangana, India.   2Centre for chemical sciences & Technology, Institute of Science and Technology, Jawaharlal Nehru Technological University Hyderabad, Kukatpally, Hyderabad 500085, Telangana, India.   Corresponding author E-mail: jagadeeshn@drreddys.com
DOI : http://dx.doi.org/10.13005/ojc/310363
ABSTRACT: Diltiazem (DTZ) is an optically active calcium channel blocker having a benzodiazepine structure. Two impurities (referred as DTZ-I and DTZ-II) were detected with area percentages ranging from 0.1% to 0.15% during the impurity profile study of Diltiazem hydrochloride drug substance. A simple isocratic high performance liquid chromatographic method (HPLC) and liquid chromatography–mass spectrometry (LC–MS) were used for the detection. The impurities were isolated by preparative column chromatography. Analytical information from nuclear magnetic resonance and mass spectral data of the potential impurities revealed their structures as 2-(4-methoxyphenyl)-5-methyl-4-oxo-2,3,4,5-tetrahydrobenzo[b][1,4]thiazepin-3-yl acetate (DTZ-I) and 2-(4-methoxyphenyl)-4-oxo-5-vinyl-2,3,4,5-tetrahydrobenzo[b][1,4]thiazepin-3-yl acetate (DTZ-II). Impurity identification, isolation and structure elucidation were discussed.
KEYWORDS: Diltiazem; Potential impurities; Isolation; characterization techniques

Copy the following to cite this article:

Jagadeesh N, Ravindrakumar Y, Mohanty S, Srinivasarao T, Jayashree A. Analytical Characterization of two new related impurities of Diltiazem by High Resolution Mass spectrometry and NMR techniques. Orient J Chem 2015;31(3).

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DILTIAZEM IS

Diltiazem structure.svg






























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