Explorations on the Total Synthesis of the Unusual Marine Alkaloid Chartelline A
作者:Cuixiang Sun、Xichen Lin、Steven M. Weinreb
DOI:10.1021/jo060084f
日期:2006.4.1
In work directed toward a total synthesis of chartelline A (1a), a strategy was investigated to construct the 10-membered ring of this marine alkaloid via an intramolecular aldehyde/β-lactam cyclocondensation to form the macrocyclic enamide functionality. Therefore, spiro-β-lactam and imidazole fragments were first prepared. Tribromooxindole β-lactam 24 was synthesized from commercially available 5-nitroisatin