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Bioorg Med Chem. 2008 Jan 1;16(1):255-65. Epub 2007 Sep 26.

Chemo-, regio-, and stereoselectivity of F-ring opening reactions in the cephalostatin series.

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  • 1Basic Sciences Department, Faculty of Engineering Technology, Al-Balqa Applied University, PO Box 15008, 11134 Amman, Jordan.


In an effort to prepare unsymmetrical cephalostatin analogues with multi-functionality, we tried the route of selective opening of the spiroketal joining rings E and F. In this study, we have tested several borane complexes (like borane-9-BBN, borane-(N-tosyl)-D-valine, and borane-catechol) with some bis-steroidal pyrazine derivatives like 3, 4, and 16 aiming at opening ring-F at only one spiro-system of the dimer. Upon testing these borane reagents, satisfying results were obtained in the case of the keto-methylene 4 using the catechol-borane complex. The structures of the resulting mono-opened and also some double-opened spiro dimers have been completely confirmed. Some of the prepared compounds were tested against three cancer cell lines: HM02 (stomach cancer), HEP G2 (hepatocellular cancer), and MCF 7 (breast cancer).

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