29417-89-8Relevant articles and documents
Highly efficient synthesis of functionalized α-oxyketones: Via Weinreb amides homologation with α-oxygenated organolithiums
Pace, Vittorio,Murgia, Irene,Westermayer, Sophie,Langer, Thierry,Holzer, Wolfgang
supporting information, p. 7584 - 7587 (2016/07/06)
An efficient, chemoselective homologation of Weinreb amides to the corresponding variously substituted α-oxyketones has been developed via the addition of lithiated α-oxygenated species. This one-step, experimentally easy, high yielding protocol is amenable not only for accessing simple α-oxyketones but also for more complex substituted ones ranging from primary and secondary alkyl-type to aromatic ones. Full delivery of the stereochemical information contained in the starting materials is observed through both the employment of enantioenriched Weinreb amides and optically active organolithium species.
Silver ion-assisted solvolysis of 2,2-dibromo-1-phenylcyclopropanecarboxylic acid: Solvent-dependent competition between decarboxylation and ring closure
Sydnes, Leiv K.,Mungaroo, Rajesh,Svendsen, John S.
, p. 1392 - 1398 (2007/10/03)
The solvolysis of the title compound has been studied in several alcohols (methanol, 2,2,2-trifluoroethanol, isopropyl alcohol, tert-butyl alcohol and ,1,1,3,3,3-hcxafluoro-2-propanol [HFP]) in the presence of an excess of silver trifluoroacetale. In all solvents the corresponding butenolide, 4-bromo-3-phenyl-2(5H)-furanone, was a major or the predominant product. Another product formed in all solvents but HFP was (Z)-4-alkoxy-3-bromo-2-phenyl-2-butenoic acid, which resulted from solvent attack on intermediate allylic cations. Furthermore, both 3-alkoxy-1-phenyl-1-propyne and 3-alkoxy-1-phenyl-1-propanone were formed except when reactions were performed in HFP; their formation involved decarboxylation and their total yield was 15-40%. Acta Chemica Scandinavica 1998.
Baker's yeast-mediated reduction of α-hydroxy ketones and derivatives: The steric course of the biotransformation
Ferraboschi, Patrizia,Grisenti, Paride,Manzocchi, Ada,Santaniello, Enzo
, p. 10539 - 10548 (2007/10/02)
The results from the baker's yeast-mediated reduction of the acetates 3a- d and the methyl ethers 5a-d were compared with the same biotransformation which converts the α-hydroxy ketones 1a-d into the (R)-diols 2a-d (90- 98%ee); the acetates 3a-d afford the (S)-monoacetates 4a-d (72-94% ee) and the methyl ethers 5a-d are reduced to the (R)-monoethers 6a-d (64-76% ee).