Trifluoromethanesulfonic (triflic) acid catalyzed transformations of .alpha.-hydroxy carbonyl compounds
摘要:
Triflic acid catalyzed reaction of 2-hydroxy-2-adamantanecarboxylic acid results via ionizative decarbonylation in the formation of adamantonone. Under carbon monoxide pressure pinacol-type rearrangement gives 4,5-homoadamantanedione. Reaction of a series of alpha-hydroxy ketones result in fragmentation, deprotonation, and cyclization, respectively. The reactions and their suggested mechanism are discussed.
.alpha.-Heterosubstituted phosphonate carbanions. 11. Benzoins via an acyl anion equivalent. Novel one-pot preparation of benzo[b]furans via benzoins using hydriodic acid
α-Heterosubstituted phosphonate carbanions IX: diethyl 1-phenyl-1-trimethylsiloxymethane phosphonate as an acyl anion equivalent; A novel method for the preparation of α-hydroxyketones.
作者:Rusty E. Koenigkramer、Hans Zimmer
DOI:10.1016/s0040-4039(00)78827-7
日期:1980.1
Diethyl 1-phenyl-1-trimethylsiloxymethane phosphonate carbanion was found to react as an effective acyl anion equivalent in the preparation of α-hydroxy ketones from aliphatic and aromatic aldehydes and ketones. A 1,4-oxygen-oxygen silicon migration was also observed.