Practical synthesis of the putative polyamine spider toxin FTX: a proposed blocker of voltage-sensitive calcium channels
摘要:
FTX (FTX-3.3), a putative polyamine toxin from American funnel-web spiders, has been synthesized from tri-CBZ-L-arginine. Raney nickel mediated desulfurization of a thioamide, generated selectively with Lawesson's reagent in the presence of the benzyloxycarbamates, allowed ready access to the S-enantiomer. The synthetic sample with the claimed structure for FTX-3.3 differs spectroscopically from the data published for the isolated toxin. The published structure requires a reappraisal of the spectroscopic data.
Practical synthesis of the putative polyamine spider toxin FTX: a proposed blocker of voltage-sensitive calcium channels
摘要:
FTX (FTX-3.3), a putative polyamine toxin from American funnel-web spiders, has been synthesized from tri-CBZ-L-arginine. Raney nickel mediated desulfurization of a thioamide, generated selectively with Lawesson's reagent in the presence of the benzyloxycarbamates, allowed ready access to the S-enantiomer. The synthetic sample with the claimed structure for FTX-3.3 differs spectroscopically from the data published for the isolated toxin. The published structure requires a reappraisal of the spectroscopic data.