Bioactive Natural Products Part I by Atta-ur-Rahman

By Atta-ur-Rahman

The publication comprises articles written through top professionals of their respective fields of analysis. It offers present frontiers and destiny instructions for study in accordance with vital discoveries made within the box of bioactive ordinary items. - quantity 28 is a part of an exceptional kin of precious reference books - Illustrates the categories of serious discoveries that emerge from the interface of chemistry and biology - Contributions are from well-respected authors

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Lupane derivatives 21-24fromL pyrifolia COOH 21 R=OH R'=H 22 R»H R'«OH COOH 23 R-H 24 R«OH The EIMS of compounds 23 and 24 showed molecular peaks [M]^ at m/z 608 and 624 corresponding to the formulas C37H52O7 and C37H52O8, respectively. The ^^C-NMR spectrum of both compounds revealed 37 carbon signals. Those of 23 were sorted by ^^C-DEPT NMR into seven methyls, eight methylenes, five methines, five quatemaries, two alcoholic methines, one carboxylic acid, one -COOR, and two olefinic carbons (one =CH and one quatemary).

Cheih, C. Phytochemistry, 1990,29,2738-2740. E. Phytochemistry, 1982,21,2107-2109. ; Namba, T. Phytochemistry, 1995, 40, 945-947. ; Okuda, T. Chem. Pharm. Bull, 1988, 36, 2090-2097. N. , 1983,24, 3013-3016. ; Sii2aiki, T. Agric. , 1991,55,1333-1341. -N. , 1999, 62, 1033-1035. -N. Phytochemistry, 1997, 44, 943-947. M. Tetrahedron, 1991, 47, 79918000. S. Phytochemistry, 1989,28,3564-3566. ; Mester, I. Phytochemistry, 1984,23,2114-2115. N. Phytochemistry, 1986, 25, 1697-1699. ; Fujimoto, Y. , 2001, ^P, 151-153.

There is a substantial literature on the utilization of 5. papyrifera, in particular, in the paper industry in East Asia. Extracts of Broussonetia species have exhibited various biological activities including antifungal, antiinflammatory, antioxidant, and antispasmodic activities. Broussonetines, a class of pyrrolidine alkaloids from B. kazinoki, have shown potent but generally non-specific glycosidase inhibitory activity. The structures of these alkaloids were elucidated by analyzing NMR data including ^H-^H COSY, ^H-^^C HSQC (HMQC), and ^H-^^C HMBC 2D-NMR techniques and the absolute stereochemistry was determined by a combination of the benzoate chirality and Mosher's methods.

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