The palladium-catalyzed tandem cyclization/cross-coupling reaction of triethyl(indol-2-yl)borate with vinyl bromide was successfully used in the concise totalsynthesis of the indolophenanthridine alkaloids, calothrixins A and B.
钯催化的三乙基(吲哚-2-基)硼酸与溴乙烯的串联环化/交叉偶联反应成功地用于吲哚菲啶生物碱、calothrixins A 和 B 的简明全合成。
The concise totalsynthesis of calothrixins A and B has been accomplished by utilizing the one-pot formation of hexatriene as a key intermediate via the palladium-catalyzed tandem cyclization/cross-coupling reaction of triethyl(indol-2-yl)borate. In another key transformation, the indolo[3,2-j]phenanthridine core was prepared in high yield via Cu(I)-mediated 6π-electrocyclization.