Copper-Catalyzed (4+1) Cascade Annulation of Terminal Alkynes with 2-(Tosylmethyl)anilines: Synthesis of 2,3-Disubstituted Indoles
作者:Xu Yan、Chun-Fang Liu、Xian-Tao An、Xiao-Min Ge、Qing Zhang、Lin-Han Pang、Xu Bao、Chun-An Fan
DOI:10.1021/acs.orglett.1c03402
日期:2021.11.19
alkynes as one-carbon synthons with 2-(tosylmethyl)anilines has been developed for the expeditious synthesis of 2,3-disubstituted indoles, in which in situ generations of aza-o-quinone methides and alkynyl-copper(I) species are involved. This annulation provides an effective method for the assembly of synthetically and structurally interesting 2,3-disubstituted indoles.
已经开发了一种基于 Cu 催化 (4+1) 级联环化末端炔作为单碳合成子与 2-(甲苯磺酰甲基)苯胺的新策略,用于快速合成 2,3-二取代吲哚,其中原位生成的氮杂Ó -quinone甲基化物和炔基-铜(I)类的参与。这种环化为合成和结构上有趣的 2,3-二取代吲哚的组装提供了一种有效的方法。
Rhodium(<scp>iii</scp>)-catalyzed coupling of N-sulfonyl 2-aminobenzaldehydes with oxygenated allylic olefins through C–H activation
作者:Tingting Yang、Tao Zhang、Shangdong Yang、Shanshan Chen、Xingwei Li
DOI:10.1039/c4ob00704b
日期:——
N-Sulfonyl-2-aminobenzaldehyde undergoes C–H activation and coupling with oxygenated allylic olefins under redox-neutral conditions with high efficiency.
The base-induced formal [4+3] cycloaddition reaction of C,N-cyclic azomethine imines with aza-ortho-quinone methides, generated in situ, is reported. This protocol provided an efficient method for the synthesis of biologically important 1,2,4-triazepine derivatives, with a wide substrate scope and excellent functional-group tolerance, and it gives moderate to excellent yields under mild conditions
The N-heterocyclic carbene-catalyzed enantioselective intramolecular benzoin reaction of N-tethered substrates was realized. With 15 mol % of d-camphor-derived triazolium salt E and 10 mol % of NaOAc, the aldehyde–ketonecrossbenzoin reactions of various substituted N-tethered substrates proceeded smoothly to afford dihydroquinolinone derivatives with a quaternary carbon stereocenter in moderate to
A method for the preparation of indolines via palladium-catalyzed aerobic intramolecular allylic CH activation was developed. Oxygen was successfully used as oxidant with catalytic amount of 1,4-benzoquinone. 16 examples were reported, the majority of substrates gave moderate to good yields.