کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5416904 | 1506900 | 2010 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Computational study on the conformations of mitragynine and mitragynaline
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Computational study on the conformations of mitragynine and mitragynaline Computational study on the conformations of mitragynine and mitragynaline](/preview/png/5416904.png)
چکیده انگلیسی
A conformational search on mitragynine and mitragynaline, natural products isolated from the leaves of Mitragyna speciosa, was performed using the MMFF94s force field and the quantum mechanical B3LYP method. The main difference for the mitragynine conformers is caused by the position of the lone pair of the nitrogen shared by rings 3 and 4. Specifically, the lone pair can be syn or anti to the exocyclic ethyl group on ring 4. Syn was found to be lower in energy than anti, because of less steric hindrance between the ethyl and the methylene group adjacent to the N in ring 3. The geometrical parameters for the lowest energy conformer of mitragynine are in excellent agreement with the published X-ray crystal structure's geometry. Because it has one more double bond, mitragynaline has less conformational freedom than mitragynine. The main possible conformational choice in mitragynaline is for orientational flexibility of a C-C single bond in ring 3. The finding of two low-energy conformers of mitragynaline differing in ring 3 conformation matches reported X-ray crystal structural data.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Structure: THEOCHEM - Volume 945, Issues 1â3, 15 April 2010, Pages 57-63
Journal: Journal of Molecular Structure: THEOCHEM - Volume 945, Issues 1â3, 15 April 2010, Pages 57-63
نویسندگان
Haining Liu, Christopher R. McCurdy, Robert J. Doerksen,