Synthesis of Functionalized Indoles via Palladium-Catalyzed Aerobic Cycloisomerization of <i>o</i>-Allylanilines Using Organic Redox Cocatalyst
作者:Xiao-Shan Ning、Mei-Mei Wang、Jian-Ping Qu、Yan-Biao Kang
DOI:10.1021/acs.joc.8b01999
日期:2018.11.2
A scalable and practical synthesis of functionalized indoles via Pd-tBuONO cocatalyzed aerobic cycloisomerization of o-allylanilines is reported. Using molecular oxygen as a terminal oxidant, a series of substituted indoles were prepared in moderate to good yields. The avoidance of hazardous oxidants, heavy-metal cocatalysts, and high boiling point solvents such as DMF and DMSO enables this method
报道了通过Pd- t BuONO共催化邻烯丙基苯胺的好氧环异构化可规模化和实用地合成官能化的吲哚。使用分子氧作为末端氧化剂,以中等至良好的产率制备了一系列取代的吲哚。避免使用有害的氧化剂,重金属助催化剂和高沸点溶剂(例如DMF和DMSO),可使该方法应用于药物合成。吲哚美辛的实用克级合成证明了其应用潜力。
Coupling and Cyclization of <i>o</i>-Iodoanilines and Propargylic Bromides via Allenes: An Efficient Entry to Indomethacin
作者:Can Zhu、Shengming Ma
DOI:10.1021/ol401115a
日期:2013.6.7
sequential allene synthesis and cyclization has been realized in a one-pot manner. A Pd(0)-catalyzed one-pot reaction of N-Ts or -Ms 2-iodoanilines and propargylic bromides afforded indoles with pharmaceutical importance highly efficiently with diversity via sequential carbon–carbon bond coupling forming allenes and azapalladation. With this newly established methodology, an efficient approach to indomethacin
Construction of 2‐Methylindoles Using Solid Calcium Carbide as a Substitute for Gaseous Acetylene
作者:Zhiqiang Wang、Zhenrong Liu、Botao Wang、Zheng Li
DOI:10.1002/ejoc.202301262
日期:2024.2.5
efficient method for the construction of 2-methyl-1-sulfonylindoles and 2,3-dimethyl-1-sulfonylindoles usingsolidcalciumcarbide as an alkynesource and o-sulfonamidobenzaldehyde hydrazones and o-sulfonamidoacetophenone hydrazones as starting materials is described. The use of easy-to-handle alkynesource and low-cost catalyst, wide substrate scope, high yield, and simple workup procedures are salient