(and in some cases rhodium) catalysed regiospecific 5-exo-, 6-endo-and 6-exo-trig cyclisations of aryl iodides and vinyl bromides onto proximate alkenes or heteroaromatic rings (indole, pyrrole) lead to a wide variety of fusedring systems. In appropriate cases the methodology provides a facile approach to the creation of tetrasubstituted carbon centres. Double bond isomerisation in the product is only
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。
Synthesis of 6H-isoindolo[2,1-a]indol-6-ones through a sequential copper-catalyzed C-N coupling and palladium-catalyzed C–H activation reaction
作者:Hua-Feng He、Sheng Dong、Yi Chen、Yang Yang、Yueqin Le、Weiliang Bao
DOI:10.1016/j.tet.2012.01.087
日期:2012.4
A series of 6H-isoindolo[2,1-a]indol-6-ones were synthesized through one-pot sequential coupling reactions, which were comprised of a copper-catalyzed C–N coupling cyclization and a palladium-catalyzedC–Hactivation course. General chemicals benzoyl chlorides and o-gem-dibromovinyl anilines were employed as the starting substrates.
通过一锅顺序偶联反应合成了一系列6 H-异吲哚并[2,1 - a ]吲哚-6-酮,其中包括铜催化的C–N偶联环化和钯催化的C–H。激活过程。通用化学品苯甲酰氯和邻-宝石-二溴乙烯基苯胺用作起始底物。
A Pd-catalyzed domino Larock annulation/dearomative Heck reaction
A palladium-catalyzed domino Larock annulation/dearomative Heckreaction is developed, which delivers a range of tetracyclic indoline derivatives in moderate to excellent yields through a Larock annulation of N-bromobenzoyl o-iodoanilines with alkynes and a subsequent intramolecular dearomative Heckreaction. This protocol provides a straightforward route to structurally diverse indolines from readily
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