72450-34-1Relevant academic research and scientific papers
Aerobic α-hydroxylation of β-keto esters and amides by co-catalysis of SmI3 and I2 under mild base-free conditions
Yu, Shun-Ming,Cui, Kai,Lv, Fei,Yang, Zhen-Yu,Yao, Zhu-Jun
supporting information, p. 2818 - 2821 (2016/06/09)
A clean base-free α-hydroxylation of β-keto esters and amides has been developed, in which air was used as the oxygen source and SmI3 and I2 were applied as the catalysts, affording the corresponding α-hydroxylated 1,3-dicarbonyl pro
Extended reaction scope of thiamine diphosphate dependent cyclohexane-1,2-dione hydrolase: From C-C bond cleavage to C-C bond ligation
Loschonsky, Sabrina,Wacker, Tobias,Waltzer, Simon,Giovannini, Pier Paolo,McLeish, Michael J.,Andrade, Susana L. A.,Müller, Michael
supporting information, p. 14402 - 14406 (2015/02/19)
ThDP-dependent cyclohexane-1,2-dione hydrolase (CDH) catalyzes the CC bond cleavage of cyclohexane-1,2-dione to 6-oxohexanoate, and the asymmetric benzoin condensation between benzaldehyde and pyruvate. One of the two reactivities of CDH was selectively knocked down by mutation experiments. CDH-H28A is much less able to catalyze the CC bond formation, while the ability for CC bond cleavage is still intact. The double variant CDH-H28A/N484A shows the opposite behavior and catalyzes the addition of pyruvate to cyclohexane-1,2-dione, resulting in the formation of a tertiary alcohol. Several acyloins of tertiary alcohols are formed with 54-94% enantiomeric excess. In addition to pyruvate, methyl pyruvate and butane-2,3-dione are alternative donor substrates for CC bond formation. Thus, the very rare aldehyde-ketone cross-benzoin reaction has been solved by design of an enzyme variant.
Cerium-catalyzed α-hydroxylation reactions of α-cyclopropyl β-dicarbonyl compounds with molecular oxygen
Christoffers, Jens,Kauf, Thomas,Werner, Thomas,Roessle, Michael
, p. 2601 - 2608 (2007/10/03)
Three α-cyclopropyl β-dicarbonyl compounds have been used as probes for α-radicals as electrophilic reaction intermediates in a cerium-catalyzed α-hydroxylation reaction with molecular oxygen. Since the cyclopropyl group did not ring-open to products with a butenyl moiety, but was retained in the products, a localized unpaired electron at the α position can be excluded during the course of the reaction. The α-cyclopropyl- substituted substrates were prepared by aldol or Claisen reactions. Other substrates with α-methyl, α-isopropyl, and α-tert-butyl substituents were prepared and converted under the α-hydroxylation conditions in order to estimate steric influences on the yield of the reaction. Wiley-VCH Verlag GmbH & Co. KGaA, 2006.
A New Synthesis of Methyl α-Acetolactate based on Thiazolium Chemistry and modelled on the Enzymatic Synthesis of α-Acetolactate catalysed by Acetolactate Synthase
Crout, David H. G.,Lee, Edward R.,Pearson, David P.J.
, p. 331 - 333 (2007/10/02)
Methyl α-acetolactate has been synthesised via a series of adducts with benzothiazole in a manner analogous to the enzymatic reaction catalysed by acetolactate synthase.
Synthesis of 2-Hydroxy-3-oxocarboxylic Esters From the Corresponding α,β-Unsaturated Esters by a Simple One-Step Procedure
Crout, D. H. G.,Rathbone, D. L.
, p. 40 - 42 (2007/10/02)
A convenient one-step synthesis of 2-alkyl-2-hydroxy-3-oxocarboxylic esters by potassium permanganate oxidation of the corresponding readily available α,β-unsaturated esters is described.Preparation of the latter by the phosphonate modification of the Wit
Catalysis by Di-n-butyltin Oxide of a Tertiary Ketol Rearrangement: Synthesis of Intermediates and Analogues of Valine and Isoleucine Biosynthesis
Crout, David H. G.,Rathbone, Daniel L.
, p. 290 - 291 (2007/10/02)
Di-n-butyltin oxide efficiently catalyses the rearrangement of 3-hydroxy-2-oxocarboxylic acid ester into the corresponding 2-hydroxy-3-oxo-esters, in a reaction that simulates the reversible rearrangement catalysed by the enzyme reductoisomerase.
