Biogeneration and Biodegradation of Raspberry Ketone in the Fungus Beauveria bassiana
摘要:
In growing cultures of the fungus Beauveria bassiana (ATCC 7159) the incubation of 4-(4'-hydroxyphenyl)but-3-en-2-one (p-hydroxybenzylidenacetone, 3), of 4-(4'-hydroxyphenyl)butan-2-one (raspberry ketone, 1), and of the S and R,S forms of 4-(4'-hydroxyphenyl)butan-2-ol (2) yields 2-(4'-hydroxyphenyl)ethanol (tyrosol, 4) as a final product. The experiments support the view that the actual substrate for the Baeyer-Villiger-type degradation is raspberry ketone (1) and that there is a kinetic preference in the microbial enzymatic system for the oxidation to 1 of the S form of the 4-(4'-hydroxyphenyl)butan-2-ol (2).
An Algorithm for the Deconvolution of Mass Spectrosopic Patterns in Isotope Labeling Studies. Evaluation for the Hydrogen−Deuterium Exchange Reaction in Ketones
作者:Christian C. Gruber、Gustav Oberdorfer、Constance V. Voss、Jennifer M. Kremsner、C. Oliver Kappe、Wolfgang Kroutil
DOI:10.1021/jo070831o
日期:2007.7.1
180 °C within 40−200 min. Compared to reflux conditions, the microwave-assisted protocol led to a reduction of the required reaction time from 75−94 h to 40−200 min. The α-labeled deuterium ketones were reduced by biocatalytichydrogentransfer to the corresponding enantiopure chiral alcohols and the deconvolution algorithm validated by regression analysis of a mixture of labeled and unlabeled ketones/alcohols
Herein, α-deuteration of ketones, sulfones, sulfoxides and nitriles catalyzed by BaO was achieved. The desired deuterated products were obtained with high yield and high d-incorporation. The protocol had broad functional group tolerance and was scalable and applicable in preparing exemplary bioactive ketone candidates.
在此,实现了 BaO 催化的酮、砜、亚砜和腈的 α-氘化。以高产率和高 d-掺入获得所需的氘化产物。该协议具有广泛的功能组耐受性,并且可扩展并适用于制备示例性生物活性酮候选物。
Stereochemistry of the Baeyer−Villiger-Type Conversion of 4-(4-Hydroxyphenyl)butan-2-one (Raspberry Ketone) into Tyrosol Mediated by <i>Beauveria bassiana</i>
Feeding experiments in Beauveria bassiana (ATCC 7159) of (2R,3S)-[2,3-H-2(2)]-4-(4-hydroxyphenyl)-butan-2-ol (15) and (2R,3R)-[1,3-H-2(4)]-(4-hydroxyphenyl)-butan-2-ol (16) afford (1S)- and (IR)-[1-H-2]tyrosol (17) and (18), respectively, as indicated by NMR studies on the (+)-MTPA esters 21 and 23 and comparison with an authentic sample of the (S) enantiomer. These results indicate that the C-2, Baeyer-Villiger-type, chain shortening of the C-6-C-4 framework of the intermediate raspberry ketone 1 to give the C-6-C-2 tyrosol (4) occurs with retention of configuration. The asymmetrically labeled substrates 15 and 16 have been obtained by enzymic resolution of derivatives of (2SR,3RS)-6 and (2SR,3SR)-12, prepared, in turn, by syn catalytic reduction with deuterium and with hydrogen gas, respectively, of the (Z) enol acetates 5 and 11.
Biogeneration and Biodegradation of Raspberry Ketone in the Fungus <i>Beauveria bassiana</i>
In growing cultures of the fungus Beauveria bassiana (ATCC 7159) the incubation of 4-(4'-hydroxyphenyl)but-3-en-2-one (p-hydroxybenzylidenacetone, 3), of 4-(4'-hydroxyphenyl)butan-2-one (raspberry ketone, 1), and of the S and R,S forms of 4-(4'-hydroxyphenyl)butan-2-ol (2) yields 2-(4'-hydroxyphenyl)ethanol (tyrosol, 4) as a final product. The experiments support the view that the actual substrate for the Baeyer-Villiger-type degradation is raspberry ketone (1) and that there is a kinetic preference in the microbial enzymatic system for the oxidation to 1 of the S form of the 4-(4'-hydroxyphenyl)butan-2-ol (2).
One-Pot Sequential Hydrogen Isotope Exchange/Reductive Deuteration for the Preparation of α,β-Deuterated Alcohols using Deuterium Oxide
作者:Hengzhao Li、Zemin Lai、Mengqi Peng、Lei Ning、Qixin Dong、Yuxia Hou、Jie An
DOI:10.1021/acs.orglett.2c01940
日期:2022.7.29
An efficient one-pot sequential hydrogen isotope exchange (HIE)/reductive deuteration approach was developed for the preparation of α,β-deuterated alcohols using ketones as the precursors. The HIE step can also be used for the synthesis of α-deuterated ketones. This method has been applied in the synthesis of four deuterated drug and MS internal standards.