作者:Steven A. Fleming、Sean M. Carroll、Jennifer Hirschi、Renmao Liu、J. Lee Pace、J. Ty Redd
DOI:10.1016/j.tetlet.2004.03.037
日期:2004.4
We have used asymmetricdihydroxylation (AD) of allenes in order to synthesize chiral α-hydroxy ketones. This methodology has been applied to several aryl-substituted allenes. We have found that electron donating groups on the aromatic ring increase the efficiency of the reaction.
Although yeast reduction of α-diketones 1 affords a mixture of two α-hydroxy ketones and a vic-diol, the use of methyl vinyl ketone as an enzyme inhibitor prevents the production of the diol. Regioselectivity in the reduction to afford α-hydroxy ketones is improved by thermal pre-treatment of baker's yeast. Thus, 1-phenyl-2-hydroxy-1-propanone 3a is obtained in 80 % yield with >98% e.e.
Catalytic Scope of the Thiamine-Dependent Multifunctional Enzyme Cyclohexane-1,2-dione Hydrolase
作者:Sabrina Loschonsky、Simon Waltzer、Sonja Fraas、Tobias Wacker、Susana L. A. Andrade、Peter M. H. Kroneck、Michael Müller
DOI:10.1002/cbic.201300673
日期:2014.2.10
cyclohexane‐1,2‐dione hydrolase (CDH) catalyzes the asymmetric cross‐benzoin reaction of aromatic aldehydes and pyruvate (up to quantitative conversion and 92–99 % ee). Notably, CDH accepts several aldehydes, such as hydroxybenzaldehydes, nitrobenzaldehydes, and naphthaldehydes; previously, these have only in rare cases been known as substrates of other thiamine‐dependent enzymes.
(S)-Phenylacetylcarbinol [(S)-PAC] and its derivatives are valuable intermediates for the synthesis of various APIs (active pharmaceutical ingredients), however their selective synthesis is challenging. As no highly selective enzymes or chemical...
(S)-苯基乙酰基甲醇[[ S ] -PAC ]及其衍生物是合成各种API(活性药物成分)的有价值的中间体,但是它们的选择性合成具有挑战性。由于没有高度选择性的酶或化学物质...
[DE] VERFAHREN ZUR HERSTELLUNG SUBSTITUIERTER PHENYLACETYLCARBINOLE<br/>[EN] METHOD FOR PRODUCING SUBSTITUTED PHENYLACETYL CARBINOLS<br/>[FR] PROCEDE DE PRODUCTION DE PHENYLACETYLCARBINOL SUBSTITUE
申请人:BASF AG
公开号:WO2007077141A1
公开(公告)日:2007-07-12
[EN] The invention relates to a method for producing substituted phenylacetyl carbinols by means of the biocatalytic reaction of the corresponding substituted aromatic aldehydes in the presence of pyruvate and/or acetaldehyde and a pyruvate decarboxylase. The invention also relates to (R)-1-hydroxy-1-(4-tert.-butoxyphenyl)-2-propanone. [FR] L'invention concerne un procédé de production de phénylacétylcarbinol substitué, par réaction biocatalytique des aldéhydes aromatiques substitués correspondants, en présence de pyruvate et/ou d'acétaldéhyde et d'une pyruvate carboxylase. L'invention concerne en outre la (R)-1-hydroxy-1-(4-tert.-butoxyphényl)-2-propanone. [DE] Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung substituierter Phenyla- cetylcarbinole durch biokatalytische Umsetzung der entsprechenden substituierten aromatischen Aldehyde in Gegenwart von Pyruvat und/oder Acetaldehyd und einer Pyruvatdecarboxylase. Die vorliegende Verbindung betrifft darüber hinaus (R)-1-Hydroxy-1-(4-tert.-butoxyphenyl)-2-propanon.