The lipase-catalyzed acetylation of a broad spectrum of racemic 2-hydroxy acids 1 to their 2-acetoxy acids 2 was shown to proceed with high enantioselectivity. Thus, the microbial lipases, in particular from Candidaantarctica and Burkholderiaspecies, are convenient biocatalysts for the synthesis of optically active 2-hydroxy acids in excellent enantioselectivity (ee values up to > 99%). The absolute
Synthesis and absolute configuration of (+)-8-hydroxyhexadecanoic acid, an endogenous inhibitor for spore germination in Lygodium japonicum.
作者:Yoshiji MASAOKA、Masayuki SAKAKIBARA、Kenji MORI
DOI:10.1271/bbb1961.46.2319
日期:——
(S)-(+)-2-Aminodecanoic acid was converted in 9 steps to (+)-8-hydroxyhexadecanoic acid, an endogenous inhibitor for spore germination in Lygodium japonicum, establishing its absolute configuration to be S.
Preparative regio- and stereoselective α-hydroxylation of medium chain mono- and dicarboxylic fatty acids
作者:Klara Bangert、Alexander Swoboda、Stephan Vrabl、Haris Rudalija、Mattia Lazzarotto、Stefan Payer、Anton Glieder、Christian A. M. R. van Slagmaat、Stefaan M. A. De Wildeman、Wolfgang Kroutil
DOI:10.1039/d3gc04593e
日期:——
for the valorization of renewables like fattyacids by α-hydroxylation. Here, peroxygenases were envisioned to be of high interest as they require common hydrogenperoxide as the only oxidant generating water as the sole side product. As the unspecific peroxygenase from Hypoxylon sp. (HspUPO) turned out to be not selective for α-hydroxylation, various bacterial peroxygenases from the CYP152 family were
A One Pot Procedure for the Synthesis of α-Hydroxyamides from the Corresponding α-Hydroxyacids
作者:Sarah E. Kelly、Thomas G. LaCour
DOI:10.1080/00397919208020850
日期:1992.3
Alpha-hydroxyamides are synthesized from the cooresponding alpha-hydroxyacids by generation of the bis-trimethylsilyl derivative and treating it with oxalyl chloride. Following addition of the appropriate amine, the TMS ether is hydrolyzed in the workup to provide the desired alpha-hydroxyamide. As summarized in Table 1, this reaction has proven to be general and compatible with chiral alpha-hydroxyacids affording the desired alpha-hydroxyamides in excellent yield (77-99%).
Enantioselective α hydroxylation of carboxylic acids with molecular oxygen catalyzed by the α oxidation enzyme system of young pea leaves (Pisum sativum): A substrate selectivity study
作者:Waldemar Adam、Michael Lazarus、Chantu R. Saha-Mǒller、Peter Schreier
DOI:10.1016/0957-4166(96)00283-2
日期:1996.8
The substrate selectivity of the a oxidation of carboxylic acids I by crude homogenate of young pea leaves was investigated. Saturated fatty acids with 7 to 16 carbon atoms and oleic acid were transformed to the enantiomerically pure (R)-2-hydroxy acids 2 in the presence of molecular oxygen. Copyright (C) 1996 Elsevier Science Ltd