Coupling reactions of indole-3-acetic acid derivatives. Synthesis of arcyriaflavin A
作者:Jan Bergman、Eva Koch、Benjamin Pelcman
DOI:10.1039/b004029k
日期:——
The bisindolesuccinic acid methyl ester 10 was obtained by an iodine-promoted coupling of the dianion 9. The diester was converted to the N-benzylimide 12, which was oxidatively cyclized to the indolo[2,3-a]pyrrolo[3,4-c]carbazole 15. The diester 10 could be directly transformed to the known indolocarbazole diester 27via acid-induced intramolecular cyclization in TFA. The same methodology gave arcyriaflavin A 4 from the succinimide 18b.
双吲哚基琥珀酸甲酯10是通过碘促进的双阴离子9的耦合反应获得的。该二酯被转化为N-苄基亚胺12,随后经过氧化环合得到吲哚[2,3-a]吡咯[3,4-c]咔唑15。二酯10可以直接通过三氟乙酸中的酸诱导分子内环合反应转化为已知的吲哚咔唑二酯27。同样的合成方法从琥珀酰亚胺18b得到了亮菌素A 4。