Preparation and Reaction of Quinolinyl (or Pyridinyl)phosphonium Salts with Base and Pivalaldehyde
摘要:
alpha- and gamma-Heteroaryltriphenylphosphonium iodides were prepared by reaction of the corresponding heteroaryl iodides with triphenylphosphine. Reaction of beta-heteroaryl iodides with triphenylphosphine in the presence of a palladium catalyst gave beta-heteroaryltriphenylphosphonium iodides. Elimination of the heteroaryl group was achieved by treating the heteroaryltriphenylphosphonium iodides with a base. Further, the heteroaryl group was trapped with pivalaldehyde to introduce a pivaloyl substituent onto the heteroaromatic ring.
Halogen Bond-Assisted Electron-Catalyzed Atom Economic Iodination of Heteroarenes at Room Temperature
作者:Imran Kazi、Somraj Guha、Govindasamy Sekar
DOI:10.1021/acs.joc.9b00174
日期:2019.6.7
halogen bond-assisted electron-catalyzed iodination of heteroarenes has been developed for the first time under atom economic condition at room temperature. The iodination is successful with just 0.55 equiv of iodine and 0.50 equiv of peroxide. The kinetic study indicates that the reaction is elusive in the absence of a halogen bond between the substrate and iodine. The formation of a halogen bond, its
The regioselective iodination of quinolines, quinolones, pyridones, pyridines and uracil
作者:Uttam Dutta、Arghya Deb、David W. Lupton、Debabrata Maiti
DOI:10.1039/c5cc07799k
日期:——
A radical based direct C-H iodination protocol for quinolines, quinolones, pyridones, pyridines, and uracil has been developed. The iodination occurs in a C3 selective manner for quinolines and quinolones. Pyridones...
NaIO4-mediated sequential iodination/amidation reaction of N-alkyl quinolinium iodide salts has been first developed. This cascade process provides an efficient way to rapidly synthesize 3-iodo-N-alkyl quinolinones with high regioselectivity and good functional group tolerance. This protocol was also amenable to the isoquinolinium salts, thus providing a complementary method for preparing the 4-iodo-N-alkyl
Ligand-Enabled Gold-Catalyzed C(sp<sup>2</sup>)–N Cross-Coupling Reactions of Aryl Iodides with Amines
作者:Manjur O. Akram、Avishek Das、Indradweep Chakrabarty、Nitin T. Patil
DOI:10.1021/acs.orglett.9b03082
日期:2019.10.4
example of ancillary (P,N)-ligand-enabled gold-catalyzed C-N cross-couplingreactions of aryl iodides with amines is reported. The high generality of the reaction in de novo synthesis, late-stage modifications, and cascade processes to access functionalized indolinones and carbazoles underscores the synthetic potential of the presented strategy. Monitoring the reaction with ESI-HRMS and NMR provided strong
Palladium-catalyzed cyanation of aryl and heteroaryl iodides with copper(I) cyanide
作者:Takao Sakamoto、Kazutoshi Ohsawa
DOI:10.1039/a903345i
日期:——
The palladium-catalyzed cyanation of aryl and heteroaryl iodides or bromides using copper(I) cyanide as a cyano group source afforded the corresponding aryl and heteroaryl cyanides in good yields.