Results 41 to 50 of about 95,231 (345)
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
openaire +6 more sources
Heteroatom-Containing Natural Sesquiterpene Lactones and Methods for their Obtaining
Eurasian Chemico-Technological Journal, 2013 This review shows the data about isolated heteroatom-containing sesquiterpene lactones from various genera of Asteraceae family, natural occurence, isolation methods and their biological activity.
S. M. Adekenov, G. A. Atazhanova
doaj +1 more source
The ring-opening polymerization of D,L-lactide in the melt initiated with tetraphenyltin [PDF]
, 1984 Melt polymerization conditions for D,L-lactide initiated with tetraphenyltin were studied with regard to polymer molecular weight and weight distributions.
Berg, J.W.A. van den +3 more
core +2 more sources
Primary familial congenital erythrocytosis: two novel EPOR mutations found in Spain [PDF]
, 1997 Two-carbon ring expansions of vinyl β-lactones, were carried out by Lewis acids (BF3-Et2O or Et2AlCl) via an ionization/cation rearrangement. β,γ-unsaturated δ-lactones were produced as efficient protocols for the synthesis of bioactive substances. Vinyl
Bento, C. +3 more
core +2 more sources
Molecules, 2018 An indium-catalyzed reaction of lactones and a disilathiane leading to thiolactones is described. The direct synthesis of thiolactones from lactones with an appropriate sulfur source is one of the most attractive approaches in organic and pharmaceutical ...
Yohei Ogiwara +3 more
doaj +1 more source
Synthesis of Nitroxide-Annulated Carbocycles and Heterocycles [PDF]
, 2012 New, pyrroline nitroxide annulated lactones, polycycles, and maleimide were synthesized by classical and microwave-assisted methodology. We report the application of the metathesis reaction in the presence of nitroxide yielding a pyrroline nitroxide ...
Berente, Zoltán +4 more
core +1 more source
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
openaire +4 more sources
5,6-Dihydro-2H-pyran-3(4H)-on als Baustein zur Synthese pyrananellierter Heterocyclen [PDF]
, 1984 Während 5,6-Dihydro-2H-pyran-3(4H)-on (3) sich mit ortho-substituierten Phenylcarbonylverbindungen nur in Einzelfällen regioselektiv zu pyrananellierten Heterocyclen umsetzt - z. B.
Eiden, Fritz, Wanner, Klaus Th.
core +1 more source
Cycloaddition Reactions of C,N-Diphenylnitrone to Methylene-γ-butyrolactones
Molecules, 2000 Cycloaddition of C,N-diphenylnitrone to α-methylene-γ-butyrolactone afforded two diastereomeric 5-spirosubstituted isoxazolidines with high selectivity.
Andrea Goti +3 more
doaj +1 more source
Organocatalytic synthesis of axially chiral atropisomers [PDF]
, 2017 This review summarises the recent progress made in the organocatalytic synthesis of atropisomeric compounds. Methodologies based on dynamic kinetic resolution and direct access to BINOL-like biaryls are described.
Renzi, P.
core +1 more source