Biogenetically Inspired Synthesis of Marine C<sub>6</sub>N<sub>4</sub> 2-Aminoimidazole Alkaloids: Ab Initio Calculations, Tautomerism, and Reactivity
作者:Robert Abou-Jneid、Said Ghoulami、Marie-Thérèse Martin、Elise Tran Huu Dau、Nathalie Travert、Ali Al-Mourabit
DOI:10.1021/ol048529e
日期:2004.10.1
[GRAPHICS]A simple synthesis of the fused tetrahydro-imidazopyridine 13 was accomplished via selective addition of protected guanidine to N-carbomethoxy-1,2-dihydropyridine in the presence of bromine. Base-mediated semicleavage of the aminal gave 4-substituted 2-aminoimidazole 14. With this new method, natural marine metabolite 3-amino-1-(2-aminoimidazol-4-yl)-prop-1-ene (1) and derivatives may now be prepared from pyridine. Ab initio calculations of the energies of tautomers I-IV and deuteration experiments have provided insight into their reactivity.