Synthesis and photo-conversion of androsta- and pregna-5,7-dienes to vitamin D3-like derivatives View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2008-09-04

AUTHORS

Michal A. Zmijewski, Wei Li, Jordan K. Zjawiony, Trevor W. Sweatman, Jianjun Chen, Duane D. Miller, Andrzej T. Slominski

ABSTRACT

Calcitriol (3ß,5Z,7E)-9,10-secocholesta-5,7,10(19)-trien-1α,3ß,25-triol) is a powerful oncostatic form of vitamin D3 that is of limited clinical utility due to hypercalcemic (toxic) effects. Since the removal of the side chain reduces or eliminates the calcemic activity of vitamin D3, secosteroidal compounds lacking or with a shortened side chain are good candidates for anti-cancer drugs. In addition, 5,7-steroidal dienes without a side chain can be generated in vivo under pathological conditions. A series of androsta- and pregna-5,7-dienes was efficiently synthesized from their respective 3-acetylated 5-en precursors by bromination-dehydrobromination and deacetylation reactions. Ultraviolet B (UVB) irradiation was used to generate corresponding 9,10-secosteroids with vitamin D-like structures. Additional products with tachysterol-like (T-like) structures or 5,7-dienes with inverted configuration at C-9 and C-10 (lumisterol, L-like) were also detected. Different doses of UVB resulted in formation of various products. At low doses, previtamin D-, T- or L-like compounds were formed as the main products, while higher doses induced further isomerization, with formation of potentially oxidized derivatives. In summary, we describe dynamic UVB induced conversion of androsta- and pregna-5,7-dienes into vitamin D-like compounds and their rearranged analogues; additionally novel T-like and L-like structures were also produced and characterized. Further biological evaluation of newly synthesized compounds should help to select the best candidate(s) for potential treatment of hyperproliferative diseases including cancer. More... »

PAGES

1570-1576

Identifiers

URI

http://scigraph.springernature.com/pub.10.1039/b809005j

DOI

http://dx.doi.org/10.1039/b809005j

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1040175454

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/19037511


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