Concise Formal Synthesis of Porothramycins A and B via Zincke Pyridinium Ring-Opening/Ring-Closing Cascade
作者:Theo D. Michels、Matthew J. Kier、Aaron M. Kearney、Christopher D. Vanderwal
DOI:10.1021/ol101035p
日期:2010.7.2
Short formal syntheses of the antitumor antibiotics porothramycins A and B from a commercially available ester of the unnatural amino acid 3-(3-pyridyl)alanine are presented. A rearrangement cascade that presumably involves a Zincke-type pyridinium ring-opening followed by cyclization of a pendant nucleophilic amide generates the salient pyrroline ring of the alkaloids.
Enantioselective synthesis of (+) porothramycin B and its 9-Demethoxy analogue
作者:Nicole Langlois、Florence Favre、Anne Rojas
DOI:10.1016/s0040-4039(00)60643-3
日期:1993.9
(+) 9-Demethoxyporothramycin B 3a and (+) porothramycin B 3b were synthesized from (S) pyroglutamic acid through a versatile and efficient route.1
(+)9-去甲氧基Spoorothramycin B 3a 和(+)spoorothramycin B 3b通过一条灵活且高效的途径,从(S)-吡咯谷氨酸中合成。