Results 21 to 30 of about 49,414 (256)

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

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

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

Sequence‐Controlled Copolymers Through Selective Ring‐Opening Polymerization of Multiunit Macrolactones [PDF]

Advanced science
Sequence‐controlled polymers were prepared through ring‐opening polymerization (ROP) exploiting esters with enhanced reactivity in the multiunit monomer induced by incorporation of a glycolate group, enabling selective ROP. ABSTRACT A new strategy for the synthesis of sequence‐controlled polymers (SCP), in which increased ester reactivity by the ...
Nieboer V, Giambattista G, Olsén P, Dinér P, Odelius K.   +4 more
europepmc   +2 more sources

Lactones in the Synthesis of Prostaglandins and Prostaglandin Analogs

, 2021
In the total stereo-controlled synthesis of natural prostaglandins (PGs) and their structural analogs, a vast class of compounds and drugs, known as the lactones, are encountered in a few key steps to build the final molecule, as: δ-lactones, γ-lactones,
Tanase, Raluca Elena,, Tanase, Constantin, Tanase, Raluca Elena, Constantin Tănase, Tanase, Constantin,, Pintilie, Lucia, Raluca Elena Tănase, Lucia Pintilie, Pintilie, Lucia,   +8 more
core   +1 more source

Highly Diastereoselective and Asymmetric Diels−Alder Reactions of Masked o-Benzoquinones with Chiral Racemic and Homochiral Furans. Synthesis of Optically Active Tricyclic γ-Lactones

, 2016
The first examples of highly diastereoselective and asymmetric Diels−Alder cycloadditions of in situ generated masked o-benzoquinones (MOBs) with chiral racemic and homochiral furans bearing a chiral center in the α-position leading to highly ...
Yu-Yu Chou (1973554), Rama Krishna Peddinti (1867516), Chun-Chen Liao (1973557)   +2 more
core   +2 more sources

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

Metabolism of steroidal lactones by the fungus Corynespora cassiicola CBS 161.60 results in a mechanistically unique intramolecular ring-D cyclization resulting in C-14 spiro-lactones

, 2017
The fungus Corynespora cassiicola metabolises exogenous steroids in a unique and highly specific manner. Central to this, is the ability of this organism to functionalise substrates (androgens, progestogens) at the highly stereochemically hindered 8 ...
Christy Hunter (17160439), James Raftery (1355160), Megan Uttley (17243536), Howard T Dodd (17243386), Yewande Inatimi Oni (17243539), John M Gardiner (16054805)   +5 more
core   +3 more sources