Synthesis of Polysubstituted 2-Iodoindenes via Iodonium-Induced Cyclization of Arylallenes
作者:Charlotte Grandclaudon、Véronique Michelet、Patrick Y. Toullec
DOI:10.1021/acs.orglett.5b03634
日期:2016.2.19
2-iodoindenes. In acetonitrile or nitromethane, electrophilic sources of iodine cations react selectively with the C2–C3 double bond of 1-arylallenes to give, after anti nucleophilic attack of the aromatic ring, 2-iodoindene products in high yields. Variations of the allenic skeletons revealed the high 5-endo selectivity and some competitive pathways of cyclization. Postfunctionalization reactions of the carbon–iodine
Synthesis of Isoquinolines through Ir<sup>III</sup>
-Catalyzed C-H Activation/Annulation from Benzimidates with Hydroxylisopropylalkynes
作者:Mingliang Liu、Wanchun Gong、Erli You、Haizhen Zhang、Lei Shi、Weiguo Cao、Jingjing Shi
DOI:10.1002/ejoc.201800410
日期:2018.9.30
An IrIII‐catalyzed cascade reaction consisting of C–H activation and annulation of benzimidates with hydroxylisopropylalkynes yields a broad range of isoquinolines in one step with good functional‐group tolerance and high efficiency.
Catalyst-Controlled [3 + 2] and [4 + 2] Annulations of Oximes with Propargyl Alcohols: Divergent Access to Indenamines and Isoquinolines
作者:Wanchun Gong、Zhi Zhou、Jingjing Shi、Bo Wu、Biyun Huang、Wei Yi
DOI:10.1021/acs.orglett.7b03546
日期:2018.1.5
Rhodium(III)- and iridium(III)-catalyzedC–H activation of oximes and coupling with propargyl alcohols is discussed. Depending on the catalyst, the reaction pathway switched between [3 + 2] and [4 + 2] annulations, thus giving divergent access to indenamines and isoquinolines in a one-pot and atom-economical manner. The hydroxyl group in the tertiary propargyl alcohol substrate was found to be crucial
Ru(<scp>ii</scp>)-catalyzed allenylation and sequential annulation of <i>N</i>-tosylbenzamides with propargyl alcohols
作者:Shreemoyee Kumar、Akshay M. Nair、Chandra M. R. Volla
DOI:10.1039/d1cc01768c
日期:——
We hereby report Ru(II)-catalyzed C(sp2)–H allenylation of N-tosylbenzamides to access multi-substituted allenylamides. Furthermore, the allenylamides were converted to the corresponding isoquinolone derivatives via base mediated annulation. The current protocol features low catalyst loading, mild reaction conditions, high functional group compatibility and desired scalability. The unique functionality
我们在此报告了 Ru( II ) 催化的N-甲苯磺酰苯甲酰胺的C(sp 2 )–H 烯丙基化以获得多取代的烯丙基酰胺。此外,通过碱介导的环化将丙二烯基酰胺转化为相应的异喹诺酮衍生物。目前的协议具有催化剂负载低、反应条件温和、官能团兼容性高和所需的可扩展性等特点。所提供的丙二烯的独特功能允许进一步转换以扩展协议的实用性。
An Approach to the Selenobromination of Aryl(thienyl)alkynes: Access to 3-Bromobenzo[<i>b</i>]selenophenes and Selenophenothiophenes
作者:Edgars Paegle、Sergey Belyakov、Pavel Arsenyan
DOI:10.1002/ejoc.201402095
日期:2014.6
A novel approach for the cyclization of arylalkynes with selenium(IV) bromide prepared in situ has been elaborated. The use of an alkene additive as a bromine scavenger provides a convenient synthetic pathway for the synthesis of a wide variety of 3-bromobenzo[b]selenophenes. Reactions can be performed open to air without the use of moisture-sensitive reagents, anhydrous solvents, or an inert atmosphere
详细阐述了一种用原位制备的溴化硒 (IV) 环化芳炔的新方法。使用烯烃添加剂作为溴清除剂为合成各种 3-溴苯并 [b] 硒酚提供了方便的合成途径。反应可以在空气中进行,无需使用对湿气敏感的试剂、无水溶剂或惰性气氛。乙炔基噻吩的硒溴化作用已用于制备硒酚[3,2-b]-和硒酚[2,3-b]噻吩。代表性衍生物的分子结构已通过 X 射线晶体学分析得到证实。