An efficient synthesis of 6H-isoindolo[2,1-a]indol-6-ones through rhodium-catalyzed NH-indole-directed C–H carbonylation of 2-arylindoles with carbonmonoxide has been developed. Preliminary mechanistic studies revealed that this reaction proceeds via N–H bond cleavage and subsequent C–H bond cleavage. Reaction monitoring via ESI-MS was used to support the formation of five-membered rhodacycle species
通过铑催化一氧化碳2-芳基吲哚的NH-吲哚定向的CH羰基化羰基反应,已开发出6 H-异吲哚并[2,1 - a ]吲哚-6-酮的有效合成方法。初步的机理研究表明,该反应通过NH键断裂和随后的CH键断裂进行。通过ESI-MS进行的反应监测用于支持催化循环中五元罗丹环物种的形成。
Facile approaches toward the synthesis of 6H-isoindolo[2,1-α]indol-6-ones via palladium-catalyzed carbonylation with carbon monoxide
6H-isoindolo[2,1-α]indol-6-ones were developed. In the first protocol, 6H-isoindolo[2,1-α]indol-6-ones were prepared from 2-(2-iodophenyl)-1H-indoles viapalladium-catalyzed intramolecular aminocarbonylation. The second involves intermolecular carbonylation of indoles with iodobenzenes followed by intramolecular cross-dehydrogenative-coupling.
catalytic system for tandem Pd-catalyzed carbonylation and C-C cross-coupling via C-H activation was designed. The proposed cascade reaction allows a facile one-step construction of a tetracyclic isoindoloindole skeleton, in which three new C-C/C-N bonds are simultaneously formed. In detail, the carbonylation of aryl dibromides with indoles and C-H activation of in situ formed N-(2'-bromoaroyl)-indole provide