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Total synthesis and biological evaluation of transvalencin Z
Kathryn M Nelson1, Christine E Salomon, Courtney C Aldrich
1Center for Drug Design, University of Minnesota, Minneapolis, Minnesota 55455, USA.
Abstract:
The emerging global epidemic of drug-resistant tuberculosis has created an urgent need to identify novel therapeutic approaches for disease treatment. Transvalencin Z (1) is a natural product from Nocardia transvalensis with relatively potent and selective antimycobacterial activity against Mycobacterium smegmatis, making it an attractive target for structure-activity and mechanism of action studies. The total synthesis of the four possible diastereomers of transvalencin Z was completed (1a-d), and the absolute configurations were defined using chemical synthesis, HPLC retention times, and optical rotation measurements. Surprisingly, none of the transvalencin Z diastereomers exhibited any inhibitory activity against a panel of microbial pathogens, including several species of mycobacteria.
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