Synthesis of Indole Phytoalexins Brassinin and Cyclobrassinin via [1-(tert-Butoxycarbonyl)indol-3-yl]-methyl Isothiocyanate as the Key Biomimetic Intermediate

Article abstract of DOI:10.1055/s-1997-761

A four-step synthesis of 1-protected indol-3-ylmethyl isothiocyanates from indole-3-carboxaldehyde has been elaborated. [1-(tert-Butoxycarbonyl)indol-3-yl]methyl isothiocyanate appeared to be a suitable biomimetic intermediate for the synthesis of protected phytoalexins brassinin and cyclobrassinin. Removing of the tert-butoxycarbonyl protecting group under specific conditions afforded phytoalexins identical with previously described compounds.