Synthesis of 6,6′-Binaphthopyran-2-one Natural Products: Pigmentosin A, Talaroderxines A and B

Efficient and stereoselective syntheses of pigmentosin A, talaroderxine A, and its diastereomer talaroderxine B are reported. The binaphthyl ring system is assembled by vanadium-catalyzed phenolic coupling of tricyclic precursors. These key intermediates were prepared by Michael–Dieckmann annulation of a protected orsellinate ester, with the requisite pyranones accessed by a new variant of Ghosez’s sulfone-epoxide annulation. Preliminary biological experiments are reported for pigmentosin

Synthesis and Biological Investigation of Δ¹²-Prostaglandin J₃ (Δ¹²-PGJ₃) Analogues and Related Compounds

A series of Δ¹²-prostaglandin J₃ (Δ¹²-PGJ₃) analogues and derivatives were synthesized employing an array of synthetic strategies developed specifically to render them readily available for biological investigations. The synthesized compounds were evaluated for their cytotoxicity against a number of cancer cell lines, revealing nanomolar potencies for a number of them against certain cancer cell lines. Four analogues (<b>2</b>, <b>11</b>, <b>21</b>, and <b>27</b>) demonstrated inhibition of nuclear export through a covalent addition at Cys528 of the export receptor Crm1. One of these compounds (i.e., <b>11</b>) is currently under evaluation as a potential drug candidate for the treatment of certain types of cancer. These studies culminated in useful and path-pointing structure–activity relationships (SARs) that provide guidance for further improvements in the biological/pharmacological profiles of compounds within this class