A palladium‐catalyzed cascade reaction has been realized for the synthesis of 5H‐pyrrolo[2,3‐b]pyrazines and 5H‐pyrazino[2,3‐b]indoles from benzyl isocyanide by choosing o‐pivaloyloximes or o‐iodoanilines as a suitable substrate. The key steps involved are (i) oxidative addition of palladium through N–O or C–I cleavage; (ii) migratory double isocyanide insertion; and (iii) cross‐dehydrogenative coupling. Notable features are good functional group tolerance as well as formation of three C–C and one C–N bonds.

中文翻译：

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钯催化双苄基异氰酸酯插入和交叉脱氢偶联合成熔融吡嗪

通过选择邻-吡咯并酮肟或邻-碘苯胺，已实现了钯催化的级联反应，可从异氰酸苄酯合成5 H-吡咯并[2,3- b ]吡嗪和5 H-吡嗪并[2,3- b ]吲哚。作为合适的基材。涉及的关键步骤是（i）通过N-O或C-I裂解氧化钯的加成；（ii）迁移性双异氰酸酯插入；（iii）交叉脱氢偶联。显着的特征是良好的官能团耐受性以及三个C–C和一个C–N键的形成。