<i>N</i>-Alkylimidazole
as Amphiphilic Organocatalyst: ‘Catalytic’ Morita-Baylis-Hillman
Reaction on Water without Organic Solvent
作者:Seijiro Matsubara、Keisuke Asano
DOI:10.1055/s-0028-1087484
日期:——
In the presence of water, a Morita-Baylis-Hillman reaction between methyl vinyl ketone and various aldehydes was performed with a catalytic amount of an imidazole carrying a hydrophobic group.
Asymmetric Reduction of α-Methylene Ketones by Using Fermenting Baker’s Yeast. Preparation of Optically Active β-Hydroxy α-Methyl Ketones
作者:Masanori Utaka、Shinji Onoue、Akira Takeda
DOI:10.1246/cl.1987.971
日期:1987.5.5
Asymmetricreduction of 4-hydroxy-3-methylenealkan-2-ones with baker’s yeast afforded (3R,4S)-4-hydroxy-3-methylalkan-2-ones in >98% ee and the (3R,4R) isomers in 67→98% ee in ratios of 1:1–2.
Enantiodivergence in the reduction of α-methyl and α-halomethyl enones by microorganisms
作者:Bruno R.S. de Paula、Dávila S. Zampieri、J. Augusto R. Rodrigues、Paulo J.S. Moran
DOI:10.1016/j.tetasy.2013.07.007
日期:2013.9
Enones (Z)-3-methyl-(Z)-3-chloromethyl- and (Z)-3-bromomethyl-4-R-3-buten-2-one (R = n-pentyl, phenyl, 2'- and 4'-chlorophenyl, 3'- and 4'-nitrophenyl, 4'-methoxyphenyl) were synthesized and subjected to reduction by the microorganisms Saccharomyces cerevisiae and Geotrichum candidum. Whereas the bioreduction of 3-methy-4-R-3-buten-2-ones afforded the corresponding (S)-4-R-3-methybutan-2-ones, the bioreduction of 3-chloromethyl- and 3-bromomethyl-4-R-3-buten-2-ones afforded the corresponding (R)-4-R-3-methybutan-2-ones. (C) 2013 Elsevier Ltd. All rights reserved.
Sulpholane––A new solvent for the Baylis–Hillman reaction
Sulpholane, a commercially available solvent, is used for the first time as a new solvent for the Baylis-Hillman reaction tinder ambient conditions; a wide variety of olefins as well as aldehydes participate very efficiently resulting in good to excellent yields of products. Acrylamide also underwent the Baylis-Hillman reaction with 4-nitrobenzaldehyde under these reaction conditions. (C) 2003 Elsevier Ltd. All rights reserved.
Basavaiah, Deevi; Gowriswari, Vellanki V. L.; Dharma Rao, Polisetti, Journal of Chemical Research, Miniprint, 1995, # 7, p. 1656 - 1673
作者:Basavaiah, Deevi、Gowriswari, Vellanki V. L.、Dharma Rao, Polisetti、Bharathi, Tirumala K.