Metal Chloride-Promoted Aldol Reaction of α-Dimethylsilylesters with Aldehydes, Ketones, and α-Enones
作者:Katsukiyo Miura、Akira Hosomi、Takahiro Nakagawa
DOI:10.1055/s-2005-871938
日期:——
In the presence of a catalytic amount of LiCl, α-dimethylsilylesters (α-DMS-esters) 1 smoothly reacted with various aldehydes at 30 °C to give aldols in good to high yields. On the other hand, the aldol reaction with ketones was effectively promoted by MgCl2 rather than by LiCl. α-Enones also underwent the metal chloride-promoted addition of 1 at the carbonyl carbon or β-carbon.
Stereoselective Enzymatic Synthesis of Chiral Alcohols with the Use of a Carbonyl Reductase from <i>Candida </i><i>m</i><i>agnoliae</i> with Anti-Prelog Enantioselectivity
作者:Dunming Zhu、Yan Yang、Ling Hua
DOI:10.1021/jo0603328
日期:2006.5.1
carbonyl reductases with anti-Prelog enantioselectivity, the activity and enantioselectivity of a carbonyl reductase from Candida magnoliae have been examined with various ketones of diverse structures. This carbonyl reductasecatalyzed the reduction of a series of ketones, α- and β-ketoesters, to anti-Prelog configurated alcohols in excellent optical purity. The usefulness of this carbonyl reductase has
Reduction of aromatic and aliphatic keto esters using sodium borohydride/MeOH at room temperature: a thorough investigation
作者:Juryoung Kim、Kathlia A. De Castro、Minkyung Lim、Hakjune Rhee
DOI:10.1016/j.tet.2010.04.062
日期:2010.6
Reduction of keto esters is a valuable alternative to produce diols. Sodiumborohydride/MeOH system at room temperature and short reaction time efficiently reduced α, β, γ, and δ-keto esters having α-keto esters as the most reactive. The ester functionality was reduced effectively due to the presence of oxo group that somehow facilitates the formation of ring intermediate. As expected, the chemoselective
One-pot preparation of β-hydroxy esters catalysed by a bis(cyclopentadienyl)titanium(<scp>IV</scp>) dichloride–zinc system
作者:Yu Ding、Gang Zhao
DOI:10.1039/c39920000941
日期:——
The reaction of α-haloesters with carbonyl compounds catalysed by Cp2TiCl2(cat.)–Zn gives β-hydroxyesters.
Cp 2 TiCl 2(cat。)-Zn催化α-卤代酯与羰基化合物的反应,生成β-羟基酯。
A Practical Method for the Reformatsky Reaction of Aldehydes
作者:Angshuman Chattopadhyay、Avinash Salaskar
DOI:10.1055/s-2000-6378
日期:——
Reformatsky reaction of aliphatic aldehydes has been performed successfully by the addition of BF3 · OEt2 to a stirred suspension of aldehyde, bromo ester and Zn dust in aqueous THF. For aromatic aldehydes, addition of benzoyl peroxide is also required to effect the reaction.