A new strategy for the synthesis of diverse benzo[<i>a</i>]carbazoles <i>via</i> a divergent catalytic Michael reaction
作者:Arya Kripalaya Ratheesh、Hazel A. Sparkes、Karnam Jayarampillai Rajendra Prasad
DOI:10.1039/c8ob00154e
日期:——
4-benzo[a]carbazole] hybrids via amine-controlled divergent reactions. The spiro products were also obtained in good yields. The structures of the synthesized cycloadducts were confirmed by elemental analysis, spectral data (FT-IR, 1H, 13C NMR and HRMS) and by single-crystal X-ray diffraction studies.The application of this divergent tandem Michael addition protocol is beneficial from the viewpoint of the diversity-oriented
α,α-二氰基亚甲基咔唑与β-硝基苯乙烯的新型发散串联迈克尔加成反应可提供高收率的多功能苯并[ a ]咔唑[BCs]和苯并二氢[ a ]咔唑[BDHCs]。此外,通过胺控制的发散反应,α,α-二氰基亚甲基咔唑,烯醌和丙二腈的直接多组分转化导致未报告的亚氨基和氨基官能化的螺[ac-8-8,4-苯并[ a ]咔唑]杂化物的形成。还获得了高产率的螺环产物。合成的环加合物的结构通过元素分析,光谱数据(FT-IR,1 H,13C NMR和HRMS)以及通过单晶X射线衍射研究。从简单的起始原料以多样性为导向一锅合成苯并[ a ]咔唑衍生物的观点,这种发散的串联迈克尔加成方案的应用是有益的。
Regioselective cycloaddition of acetylenic esters: a one-pot synthesis of novel dihydrobenzo[a]carbazoles
A one-pot procedure for the synthesis of highly substituted dihydrobenzo[a]carbazole derivatives via a regioselective cyclocondensation reaction between 2-(2,3,4,9-tetrahydro-carbazol-1-ylidene)-propanedinitrile and acetylenicesters is described.
描述了一种通过一锅法通过2-(2,3,4,9-四氢咔唑-1-亚甲基)-丙腈和炔属酯之间的区域选择性环缩合反应合成高度取代的二氢苯并[ a ]咔唑衍生物的方法。
Amine-catalyzed direct assembly of indanedione-fused spirobenzo[<i>a</i>]carbazoles from α,α-dicyanomethylidenecarbazoles
Abstract An unprecedented amine-catalyzed stereoselective reaction of α,α-dicyanomethylidenecarbazoles with indane-1,3-dione and aryl/heteroaryl aldehydes afforded a series of indanedione-fused benzo[a]carbazoles. The plausible mechanism for the formation of the final products result from the above MCR is described based on successive Knoevenagel/Michael/nucleophilic reactions. The products were obtained