A novel one‐pot [4+2]‐benzannulation approach to substituted carbazoles is accomplished by acid‐catalyzed C3‐propargylation of 2‐alkenyl/aryl indoles with 1‐aryl propargylicalcohols, followed by cycloisomerization. A variety of 2‐alkenylated indoles and 2‐aryl/heteroaryl indoles successfully participated in this tandem reaction with 1‐aryl/heteroaryl propargylicalcohols to provide diversely substituted
A mild and efficient AgSbF6-catalyzed synthesis of fully substituted pyrroles through a sequential propargylation/amination/cycloisomerization reaction
fully substitutedpyrroles via a sequential propargylation/amination/cycloisomerization was accomplished using AgSbF6 as a catalyst. The one-pot three-componentreaction of propargylic alcohols, 1,3-dicarbonyl compounds, and primary amines proceeds at a mild temperature, which prevents the formation of furan by-product. The reaction was also successfully applied to the more basic aliphatic amines with
AgSbF6-catalyzed efficient propargylation/cycloisomerization tandem reaction for the synthesis of fully substituted furans and new insights into the reaction mechanism
作者:Satheesh Gujarathi、Guangrong Zheng
DOI:10.1016/j.tet.2015.06.090
日期:2015.9
efficient AgSbF6 mediated one-pot propargylation/cycloisomerization tandem process has been developed for the construction of fully substitutedfurans through the reaction of propargylic alcohols and 1,3-dicarbonyl compounds. The isolation of a key reaction intermediate provided new insights into the reaction mechanism.
An efficient acid-catalyzed propargylation/aza-annulation sequence was developed under metal-free reaction conditions, thus leading to a one-potsynthesis of a variety of substituted β-carbolines starting from propargylic alcohols and indole 2-carbonyls. This versatile strategy was further extended to the synthesis of 5-azaindoles and 5-azabenzothiazoles. Optical properties suggested that manipulation
Straightforward Stereoselective Synthesis of Seven-Membered Oxa-Bridged Rings through <i>In Situ</i> Generated Cycloheptenol Derivatives
作者:Mengdan Wang、Liqiang Yin、Lu Cheng、Yajie Yang、Yanzhong Li
DOI:10.1021/acs.joc.1c01648
日期:2021.9.17
An iodine-mediated stereoselective synthesis of seven-membered oxa-bridged rings via in situ generated cycloheptenols was reported. This process was realized through the combination of C–C σ-bond cleavage and C–O bond-forming reactions in a one-pot fashion from simple and easily accessible raw materials. The formation of carbon radicals initiated by I2 was the key to the reaction.