Chemistry of the mycalamides: antiviral and antitumour compounds from a New Zealand marine sponge. Part 6.1–3 The synthesis and testing of analogues of the C(7)–C(10) fragment
作者:Andrew D. Abell、John W. Blunt、Glenn J. Foulds、Murray H. G. Munro
DOI:10.1039/a608168a
日期:——
The key structural features associated with the potent cytotoxicity
observed in the mycalamide, onnamide, pederin and theopederin series
have been defined on the basis of structureâactivity studies. A
model pharmacophore structure has been proposed and selected examples,
with modest bioactivity, synthesized.
[4 + 2] Cycloadditions of <i>N</i>-Alkenyl Iminium Ions: Structurally Complex Heterocycles from a Three-Component Diels−Alder Reaction Sequence
作者:Nihar Sarkar、Abhisek Banerjee、Scott G. Nelson
DOI:10.1021/ja8028153
日期:2008.7.1
N-Alkenyl iminium ions serve as conduits to three-component [4 + 2] cycloaddition reactions accessing structurally and stereochemically diverse piperidine derivatives. These cationic 2-azadienes participate in endo- or exo-selective [4 + 2] cycloadditions with electron-rich and neutral alkene dienophiles to generate a tetrahydropyridinium ion as the initial cycloadduct. In situ nucleophilic addition