Iron-Mediated Synthesis of Carbazomycin G and Carbazomycin H, the First Carbazole-1,4-quinol Alkaloids from Streptoverticillium ehimense
作者:Hans-Joachim Knölker、Wolfgang Fröhner、Kethiri R. Reddy
DOI:10.1002/ejoc.200390116
日期:2003.2
15 using the iron complex salts 13 and 14, followed by oxidative iron-mediated arylamine cyclization, afforded the carbazole derivatives 11 and 12, respectively. These carbazoles were transformed to the corresponding carbazole-1,4quinones 9 and 10 by oxidation with cerium(IV) ammonium nitrate. Finally, regioselective addition of methyllithium at C−1 provided carbazomycin G (7) and carbazomycin H (8)
咔唑-1,4-喹啉生物碱卡马霉素 G (7) 和卡马霉素 H (8) 的全合成是通过高度收敛的铁介导的咔唑框架结构实现的。使用铁络合物盐 13 和 14 对芳胺 15 进行亲电取代,然后进行氧化铁介导的芳胺环化,分别得到咔唑衍生物 11 和 12。通过用硝酸铈 (IV) 铵氧化,这些咔唑被转化为相应的咔唑-1,4 醌 9 和 10。最后,在 C-1 处区域选择性添加甲基锂提供了卡马霉素 G (7) 和卡马霉素 H (8)。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)