General Approach to Anthrapyran Antibiotics Exemplified by the Synthesis of rac-γ-Indomycinone
作者:Karsten Krohn、Hoan Trang Tran-Thien、Ishtiaq Ahmed
DOI:10.1002/ejoc.201100093
日期:2011.4
anthrapyranone 11, serving as the starting material for further side-chain elongation. For example, the ethyl-substituted anthrapyranones 12a,b,c, the corresponding bromides 13b,c, the phosphonium salts 14b,c, the olefins 22a,c, and the epoxides 23a,c are prepared by starting from 11. A first example demonstrating the potential of this route is the synthesis of the naturally occurring γ-indomycinone (24b), prepared
提出了一种新的蒽醌类抗生素的通用途径,它允许连接各种支链侧链。一个关键步骤是丙酸酯 9 的 Baker-Venkataraman 重排为二酮 10。酸催化环化得到乙基支化的蒽酮 11,作为进一步侧链延伸的原料。例如,乙基取代的蒽酮 12a、b、c、相应的溴化物 13b、c、鏻盐 14b、c、烯烃 22a、c 和环氧化物 23a、c 通过从 11 开始制备。证明这条路线的潜力是合成天然存在的γ-吲哚霉素(24b),由铜酸盐介导的环氧化物 23a 的开放制备。