Two Step Synthesis of Substituted Indolo[1,2-a]-Quinoxalin-6-Ones
摘要:
The reaction of indole-2-carboxylates with 2-fluoronitrobenzenes in 1-methyl-2-pyrrolidinone containing NaH affords the 1-(2-nitrophenyl)indole-2-carboxlyates 1. These compounds are reduced with iron in acetic acid to afford the indolo[1,2-a]quinoxalin-6(5H)-ones 2.
A versatile manganese(I) catalyst was employed in CH aminocarbonylation reactions of heteroarenes with aryl as well as with alkyl isocyanates using a removable directing group approach. Detailed experimental mechanistic studies were suggestive of an organometallic CH manganesation step, followed by a rate‐determining migratory insertion.