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Microbial Reduction of Ketopantoyl Lactone to Pantoyl Lactone [PDF]
Applied Microbiology, 1974 The results of a microbial survey study have shown that the ability to reduce added ketopantoic acid (or ketopantoyl lactone) and accumulate pantoic acid (or pantoyl lactone) in the growth medium is widespread among diverse fungi. The reductions generally proceeded with less than full stereoselectivity.
Dorothy G. Bradley +2 more
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Antimicrobial Activity of Lactones
Antibiotics, 2022 The development of bacterial resistance to antibiotics and the consequent lack of effective therapy is one of the biggest problems in modern medicine. A consequence of these processes is an urgent need to continuously design and develop novel antimicrobial agents. Among the compounds showing antimicrobial potential, lactones are a group to explore. For
Marcelina Mazur, Dorota Masłowiec
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C R C Critical Reviews in Food Science and Nutrition, 1976 Lactones represent another important class of flavor compounds that have been found in a wide variety of foods although traditionally they have been mainly associated with dairy products. This review summarizes their occurrences in foods along with their formation pathways, sensory properties, and isolation, identification, and synthesis techniques ...
Joseph A. Maga, Ira Katz
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Bulletin of the Agricultural Chemical Society of Japan, 1958 α-Exo-unsaturated-γ-butyrolactones were prepared. Reduction of α-benzylidene succinic acid esters with lithium aluminum hydride afford 2-benzylidene-1,4-butanediols. Manganese dioxide oxidation of glycols followed by silver oxide oxidation and lactonization afford α-benzylidene-γ-butyrolactones. Thus α-benzylidene-, α-anisylidene-, α-veratrylidene-, α-(
Masanao Matsui, Kyohei Yamashita
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Biocatalytic synthesis of lactones and lactams [PDF]
Chemistry – An Asian Journal, 2018 AbstractCyclic esters and amides (lactones and lactams) are important active ingredients and polymer building blocks. In recent years, numerous biocatalytic methods for their preparation have been developed including enzymatic and chemoenzymatic Baeyer–Villiger oxidations, oxidative lactonisation of diols, and reductive lactonisation and lactamisation ...
Frank Hollmann +3 more
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Reduction of ketopantoyl lactone to D-(-)-pantoyl lactone by microorganisms.
Agricultural and Biological Chemistry, 1984 The ability to reduce ketopantoyl lactone added to the culture medium to pantoyl lactone was surveyed in a variety of microorganisms. Many of the microorganisms including molds, yeasts, bacteria, actinomycetes and basidiomycetes exhibited this ability. The ratios of D-(—)- and L-(+)-isomers of the yielded pantoyl lactone, however, showed no relation to
Sakayu Shimizu +2 more
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Intramolecular Lactones of Sialic Acids [PDF]
International Journal of Molecular Sciences, 2020 The so-called “sialo-chemical-biology” has become an attractive research area, as an increasing number of natural products containing a sialic acid moiety have been shown to play important roles in biological, pathological, and immunological processes.
P. Rota +4 more
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TOTAL SYNTHESES OF MOKKO LACTONE, DEHYDROCOSTUS LACTONE, AND EREMANTHIN [PDF]
Chemistry Letters, 1984 Abstract A series of guaianolides such as mokko lactone, dehydrocostus lactone, and eremanthin which posses a common structural unit in A ring have been synthesized from 1-oxoeudesm-2-eno-13,6α-lactone in 7 steps. The key step involves solvolytic rearrangement of 1β-mesyloxyeudesm-4(14)-eno-13,6α-lactone.
Akio Ono, Masayoshi Ando, Kahei Takase
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Journal of Japan Oil Chemists' Society, 1968 Preparation of oligomers of β-propiolactone (β-PL) and e-caprolactone (e-CL) having reactive functional groups such as hydroxyl, carboxyl and acid chloride groups have been studied. In order to clarify the pattern of bond fission of the lactones, reactions of β-PLwith ethanol, acetic acid and acetyl chloride were carried out with or without catalysts ...
Yuya Yamashita +2 more
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Studies on lactone stabilities [PDF]
, 2021 The theories of Bucourt concerning the stabilities of mono-and polycyclic compounds have been critically exarnined and modified. Ring strain (as measured by heats of combustion in the literature) may be calculated with irnproved accuracy by the modified theory.
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