Chemoselective N-Heterocyclic Carbene-Catalyzed Cross-Benzoin Reactions: Importance of the Fused Ring in Triazolium Salts
作者:Steven M. Langdon、Myron M. D. Wilde、Karen Thai、Michel Gravel
DOI:10.1021/ja501772m
日期:2014.5.28
Morpholinone- and piperidinone-derived triazolium salts are shown to catalyze highly chemoselective cross-benzoin reactions between aliphatic and aromatic aldehydes. The reaction scope includes ortho-, meta-, and para-substituted benzaldehyde derivatives with a range of electron-donating and -withdrawing groups as well as branched and unbranched aliphatic aldehydes. Catalytic loadings as low as 5 mol
An Alternative Method for the Synthesis of <i>N</i>-Pentafluorophenyl Triazolium Salts
作者:Steven M. Langdon、Michel Gravel
DOI:10.1021/acs.orglett.2c02863
日期:2022.10.7
route for the synthesis of 1,2,4-triazolium salts via oxidation of a thione precursor is demonstrated. N-Pentafluorophenyl-substituted salts are produced in 20–63% overall yields. Isolation and purification of the azolium salts are simplified compared to the traditional synthetic route. Late-stage selection of the counterion allows the synthesis of a variety of salts from a parent thione. The salts have