Results 21 to 30 of about 47,838 (205)

Desymmetrization of deiesters and dinitriles to synthesize enantioenriched lactones [PDF]

, 2020
Many significant bioactive compounds contain quaternary or fully substituted chiral centers. The stereoselective synthesis of these compounds is challenging, yet highly desired because quaternary chiral centers are an important framework in biologically ...
Kelley, Amber M., NC DOCKS at The University of North Carolina at Greensboro   +1 more
core  

Formation of carboxylic acids during degradation of monosaccharides

Czech Journal of Food Sciences, 2008
The formation of low molecular carboxylic and hydroxycarboxylic acids as well as sugar and deoxysugar acids from monosaccharides (D-glucose, D-fructose, D-arabinose, DL-glyceraldehyde, and 1,3-dihydroxyacetone) was studied in three different model ...
Ondřej Novotný, Karel Cejpek, Jan Velíšek   +2 more
doaj   +1 more source

Systematic investigations on the reduction of 4-aryl-4-oxoesters to 1-aryl-1,4-butanediols with methanolic sodium borohydride

Beilstein Journal of Organic Chemistry, 2010
4-Aryl-4-oxoesters undergo facile reduction of both the keto and the ester groups with methanolic NaBH4 at room temperature to yield the corresponding 1-aryl-1,4-butanediols whereas 4-alkyl-4-oxoesters furnish the corresponding 1,4-butanolides via ...
Subrata Kumar Chaudhuri, Manabendra Saha, Amit Saha, Sanjay Bhar   +3 more
doaj   +1 more source

Lactones from the Sponge-Derived Fungus Talaromyces rugulosus

Marine Drugs, 2017
The marine-derived fungus Talaromyces rugulosus isolated from the Mediterranean sponge Axinella cannabina and cultured on solid rice medium yielded seventeen lactone derivatives including five butenolides (1–5), seven (3S)-resorcylide derivatives (6–12),
Lisa Küppers, Weaam Ebrahim, Mona El-Neketi, Ferhat C. Özkaya, Attila Mándi, Tibor Kurtán, Raha S. Orfali, Werner E. G. Müller, Rudolf Hartmann, Wenhan Lin, Weiguo Song, Zhen Liu, Peter Proksch   +12 more
doaj   +1 more source

Preparation of Enantiomeric β-(2′,5′-Dimethylphenyl)Bromolactones, Their Antiproliferative Activity and Effect on Biological Membranes

Molecules, 2018
Three novel enantiomeric pairs of bromolactones possesing a 2,5-dimethylphenyl substituent at the β-position of the lactone ring have been synthesized from corresponding enantiomeric (E)-3-(2′,5′-dimethylphenyl)hex-4-enoic acids (4) by ...
Witold Gładkowski, Aleksandra Włoch, Aleksandra Pawlak, Angelika Sysak, Agata Białońska, Marcelina Mazur, Paweł Mituła, Gabriela Maciejewska, Bożena Obmińska-Mrukowicz, Halina Kleszczyńska   +9 more
doaj   +1 more source

Aromas: Lovely to Smell and Nice Solvents for Polyphenols? Curcumin Solubilisation Power of Fragrances and Flavours

Molecules
Natural aromas like cinnamaldehyde are suitable solvents to extract curcuminoids, the active ingredients found in the rhizomes of Curcuma longa L.
Michael Schmidt, Verena Huber, Didier Touraud, Werner Kunz   +3 more
doaj   +1 more source

LC-ToF-ESI-MS Patterns of Hirsutinolide-like Sesquiterpenoids Present in the Elephantopus mollis Kunth Extract and Chemophenetic Significance of Its Chemical Constituents

Molecules, 2021
A total of nine sesquiterpenoid lactones together with phenolic compounds and other terpenes were identified from the crude methanol extract of Elephantopus mollis Kunth.
Gabin Thierry M. Bitchagno, Jean Garba Koffi, Ingrid Konga Simo, Donald Ulrich K. Kagho, Augustin Silvere Ngouela, Bruno Ndjakou Lenta, Norbert Sewald   +6 more
doaj   +1 more source

Microbial Biosynthesis of Lactones: Gaps and Opportunities towards Sustainable Production

Applied Sciences, 2021
Lactones are volatile organic compounds widely present in foods. These chemicals are applied as flavors and fragrances in the food, cosmetics and pharmaceutical industries.
Rui Silva, Eduardo Coelho, Tatiana Q. Aguiar, Lucília Domingues   +3 more
doaj   +1 more source

Scientific Opinion on Flavouring Group Evaluation 217, Revision 1 (FGE.217Rev1). Consideration of genotoxic potential for ?,?-unsaturated ketones and precursors from chemical subgroup 4.1 of FGE.19: Lactones [PDF]

EFSA Journal, 2013
The Panel on Food Contact Materials, Enzymes, Flavourings and Processing Aids of the European Food Safety Authority was requested to evaluate the genotoxic potential of 12 flavouring substances from subgroup 4.1 of FGE.19 in the Flavouring Group ...
EFSA Panel on Food Contact Materials, Enzymes, Flavourings and Processing Aids (CEF)
doaj   +1 more source

Pseudoephedrine as a Chiral Auxiliary for Asymmetric Michael Reactions:  Synthesis of 3-Aryl-δ-lactones

, 2016
The asymmetric Michael reaction of pseudoephedrine amides is reported. The 1,5-dicarbonyl products are converted to 3-aryl-δ-lactones in a two-step reduction/lactonization sequence.
Geneviève N. Boice (2529949), Jerry Murry (2221879), Mark A. Huffman (1601572), Paul J. Reider (583587), Lisa DiMichele (2023210), Jacqueline H. Smitrovich (2479894), Chuanxing Qu (2435170), James McNamara (2696353), Todd D. Nelson (2649046)   +8 more
core   +1 more source