A Biomimetic Approach to the Discorhabdin Alkaloids: Total Syntheses of Discorhabdins C and E and Dethiadiscorhabdin D
作者:Kelly Marshall Aubart、Clayton H. Heathcock
DOI:10.1021/jo9815397
日期:1999.1.1
The characteristic spirodienone structure of the discorhabdin alkaloids is readily formed by reaction of the tyramine-substituted indoloquinonimines 26, 35, and 36 with cupric chloride, triethylamine, and oxygen. This cyclization provides a possibly biomimetic route to discorhabdins C and E (41 and 42). The unbrominated spirodienone 40 reacts with hydrogen over Pd/C to give enone 46. Bromination at
Discorhabdin生物碱的特征性螺二烯酮结构很容易通过酪胺取代的吲哚喹啉亚胺26、35和36与氯化铜,三乙胺和氧的反应而形成。这种环化提供了一种可能的仿生途径,可以合成Discorhabdins C和E(41和42)。未溴化的螺二烯酮40在Pd / C上与氢反应生成烯酮46。在α位置的溴化反应得到溴烯酮的混合物,在用碱性氧化铝处理后,该溴烯酮会平滑转化为去噻二氢腐霉菌素D(4)。