Epoxide-Initiated Electrophilic Cyclization of Azides: A Novel Route for the Stereoselective Construction of Azabicyclic Ring Systems and Total Synthesis of (±)-Indolizidine 167B and 209D
[reaction: see text] A novel and general method for the stereoselective construction of 5-hydroxymethyl azabicyclic ring skeletons based on epoxide initiated electrophilic cyclization of azides has been developed and applied in the synthesis of (+/-)-indolizidine 167B and 209D with an overall yield of 16.5% and 17.8%, respectively. The efficiency of this methodology is further exemplified in the synthesis
Intramolecular Schmidt reactions of azides with carbocations: synthesis of bridged-bicyclic and fused-bicyclic tertiary amines
作者:William H. Pearson、Rajesh Walavalkar、Jeffrey M. Schkeryantz、Wen Kui Fang、James D. Blickensdorf
DOI:10.1021/ja00075a038
日期:1993.11
Aliphatic azides were captured intramolecularlyby carbocations, producing aminodiazonium ionintermediates. Carbon-to-nitrogen rearrangement then occurred, generating bridged- or fused-bicyclic a-amino carbocations or iminium ions, depending on the geometry about the C(+)-N bond. In the bridged systems, rapid elimination of the α-amino carbocations produced twisted enamines with 1-azabicyclo[3.2.2]nonene
Photoexcited Palladium-Initiated Remote Desaturation of <i>N</i>-Alkoxypyridinium Salts
作者:Weiwei Jin、Shouyun Yu
DOI:10.1021/acs.joc.2c02036
日期:2022.11.4
1,5-Hydrogen atom transfer (HAT) is an effective strategy to achieve remote desaturation of nonfunctionalized alkanes. Herein, we report a photoinduced remote desaturation reaction of N-alkoxypyridinium salts, which serve as alkoxyl radical precursors. Mechanistic studies show that a single electrontransferbetween the excited palladium complex and a N-alkoxypyridinium salt initiates a radical chain