Friday, August 9, 2019

Michellamine A ( A natural product) Essay Example | Topics and Well Written Essays - 3000 words

Michellamine A ( A natural product) - Essay Example Structurally they originate, from the acetate polymalonate pathway and not from amino acids 1. They exist as monomeric and dimeric naphthylisoquinoline alkaloids. The monomeric alkaloids which possess a naphthalene-isoquinolene linkage and the dimeric naphthylisoquinolines include the michellamines. The Michellamines comprise two monomeric naphthylisoquinoline coupled together. The Michellamine dimers A, B and C are isolated from the leaves of Ancistrocladus korupensis 1,5,16, 18, 21. These dimeric alkaloids possess highly useful medicinal properties like antiviral and antiparasitic, which are distinct from their monomeric counterparts 13. In addition they also possess several pharmacological, toxicological and antiviral properties such as the inhibition of the cytopathic effects of the Human Immunodeficiency virus which is the major causative agent of AIDS 1, 9, 12, 19. Experiments show that Michellamines A and B give protection in vitro to human CEM-SS lymphocytes against the cytopathic effects of HIV virus (14)20, 21. Michellamine B has been shown to have inhibitory effect on drug-sensitive ,drug- The naphthylisoquinoline alkaloids are exists as both monomers and dimmers. All the monomeric naphthylisoquinoline alkaloids are biaryls containing a naphthalene moiety and an isoquinoline moiety and these two are linked. They may contain a dihydrogenated (this is present in the said ref: 13,) or a tetra hydrogenated isoquinoline moiety 13. The linkage varies between the different alkaloids. There is also a restricted rotation about this linkage and hence these compounds exist as thermally stable atropisomers 1. This is an interesting characteristic feature among these alkaloids. These alkaloids are also unusual on account of the methyl group present at the 3- position and oxygenation at the 8 and/or 6 position of the isoquinoline ring, which suggest that they have a polyketide origin. These alkaloids can be grouped according

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