(TBHP)‐mediated annulationcascade between yne‐allenones and sulfonyl hydrazides has been established, in which a wide set of dihydrobenzo[f]phthalazines were synthesized through one‐pot, two‐step strategy under metal‐free conditions. The synthetic utility of these transformations leads to subsequent C−C and C−N bond‐forming reactions to effectively build up functional aza‐heterocycle with potential
在炔炔酮和磺酰肼之间建立了碘(I 2)/叔丁基过氧化氢(TBHP)介导的级联反应,其中通过一锅,两步合成了各种二氢苯并[ f ]邻苯二甲酰肼。无金属条件下的策略。这些转化的合成效用导致后续的C-C和C-N键形成反应,以有效地建立具有潜在意义的功能氮杂杂环。
Catalytic Double [2 + 2] Cycloaddition Relay Enabled C–C Triple Bond Cleavage of Yne–Allenones
catalytic double [2 + 2] cycloaddition relay reaction of yne–allenones with unactivated alkenes and alkynes has been achieved, which enabled C–C triple-bond cleavage to access more than 60 examples of functionalized phenanthren-9-ols with generally good yields. This reaction provides a regioselective and practical method for the construction of carbocyclic ring systems with a high degree of functional
Synthesis of Functionalized Indole-1-oxide Derivatives via Cascade Reactions of Allenynes and <sup><i>t</i></sup>BuONO
作者:Yan He、Tian Feng、Xuesen Fan
DOI:10.1021/acs.orglett.9b00968
日期:2019.6.7
2-diones via the cascade reaction of allenynes with alcohols/amines and tBuONO without using any catalyst. Mechanistically, the formation of 5-oxo-2H-benzo[g]indole-1-oxides involves a cascade process combining [2 + 2] cycloaddition, 1,6-addition, and ring expansion of the in situ formed cyclobutene intermediate. The construction of naphthalene-1,2-diones should undergo a ring-opening pathway. Moreover,
本文提出了通过烯丙炔与醇/胺和t BuONO的级联反应,无需使用任何催化剂即可获得5-oxo-2 H-苯并[ g ]吲哚-1-氧化物/官能化萘-1,2-二酮的新方法。从机理上讲,5-oxo-2 H-苯并[ g ]吲哚-1-氧化物的形成涉及级联过程,该级联过程将原位形成的环丁烯中间体的[2 + 2]环加成,1,6-加成和环膨胀结合在一起。萘1,2-二酮的构建应经历开环路径。此外,通过将苯并吲哚-1-氧化物容易地转化成药学上重要的1 H-苯并[ g ]吲哚-5-醇衍生物,证明了其实用性。
Synthesis of Functionalized Benzo[<i>g</i>]indoles and 1-Naphthols via Carbon–Carbon Triple Bond Breaking/Rearranging
can be selectively controlled toward the formation of two families of skeletally diverse benzo[g]indoles and 1-naphthols under mild conditions. Silver salt was found to efficiently promote indole annulation to give multifunctional benzo[g]indoles with the installation of two sulfonyl groups into the indole ring via N–S and N–F bond cleavage of NFSI, whereas NBS and NCS-mediated benzannulations occurred
已经建立了苯连接的烯-炔的新型碳-碳三键断裂和重排反应。在温和的条件下,可以选择性地控制反应,以形成两个不同骨架的苯并[ g ]吲哚和1-萘酚。发现银盐可有效促进吲哚环化,并通过NFSI的N–S和N–F键裂解,在吲哚环中安装两个磺酰基,从而形成多功能的苯并[ g ]吲哚,而NBS和NCS介导的苯环发生在二卤代1-萘酚的形成。
Novel Platinum-Catalyzed Tandem Reaction: An Efficient Approach to Construct Naphtho[1,2-<i>b</i>]furan
作者:Hao Wei、Hongbin Zhai、Peng-Fei Xu
DOI:10.1021/jo802645s
日期:2009.3.6
An efficient approach to synthesize naphtho[1,2-b]furan has been developed via platinum-catalyzedtandem reaction. This new tandem catalysis induces a cycloisomerization of allenyl ketone, followed by a 6π-electrocyclization-type reaction of carbene intermediate. The metal carbene proved to be an effective intermediate in the 6π-electrocyclization-type reaction.
通过铂催化串联反应,已经开发了一种合成萘并[1,2- b ]呋喃的有效方法。这种新的串联催化作用引起烯丙基酮的环异构化,然后进行卡宾中间体的6π-电环化型反应。金属卡宾被证明是6π-电环化型反应的有效中间体。