HIGHLY CHEMOSELECTIVE SYNTHESIS OF KETONES FROM CARBOXYLIC ACIDS AND GRIGNARD REAGENTS USING α-CHLOROENAMINES AS A CONDENSATION REAGENT
作者:Tamotsu Fujisawa、Toshiki Mori、Kazunobu Higuchi、Toshio Sato
DOI:10.1246/cl.1983.1791
日期:1983.11.5
α-Chloroenamines are found to be an effective condensation reagent of carboxylic acids and Grignardreagents under mild conditions to afford chemoselectively the corresponding ketones in high yields and in one-pot operation.
Selective Synthesis of Acylated Cross-Benzoins from Acylals and Aldehydes via <i>N</i>-Heterocyclic Carbene Catalysis
作者:Kou Onodera、Ryo Takashima、Yumiko Suzuki
DOI:10.1021/acs.orglett.1c01134
日期:2021.6.4
cross-benzoins) was achieved via selective N-heterocyclic carbene-catalyzed cross-benzoin reactions using acylals as aldehyde equivalents. Thus, the combination of ortho-substituted phenyl acylals and aromatic/aliphatic aldehydes as coupling substrates using bicyclic triazolium salts as precatalysts and potassium carbonate as a base in THF at reflux temperature selectively yielded O-acyl cross-benzoins.