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Now showing items 10381-10390 of 10416
Detailed dissection of UBE3A-mediated DDI1 ubiquitination.
(Frontiers, 2019-05-03)
The ubiquitin E3 ligase UBE3A has been widely reported to interact with the proteasome, but it is still unclear how this enzyme regulates by ubiquitination the different proteasomal subunits. The proteasome receptor DDI1 ...
Rigidified Bis(sulfonyl)ethylenes as Effective Michael Acceptors for Asymmetric Catalysis: Application to the Enantioselective Synthesis of Quaternary Hydantoins
(ACS, 2023-01-11)
The catalytic, enantio- and diastereoselective addition of
hydantoin surrogates II to “rigidified” vinylidene bis(sulfone) reagents is
developed, thus overcoming the inability of commonly employed β-
substituted vinylic ...
Brønsted Base-Catalyzed Enantioselective α-Functionalization of Carbonyl Compounds Involving π-Extended Enolates
(Wiley, 2023-11)
Chiral Brønsted base (BB) catalyzed asymmetric transformations constitute an important tool for synthesis. A meaningful fraction of these transformations proceeds through transiently generated enolate intermediates, which ...
alpha-Branched Ketone Dienolates: Base-Catalyzed Generation and Regio- and Enantioselective Addition Reactions
(Wiley-VCH, 2019-05-14)
In this study, the unique capacity of bifunctional Brønsted bases to generate α-branched ketone dienolates and control both site- and stereoselectivity of their addition reactions to representative classes of carbon ...
Catalytic Asymmetric α-Functionalization of α-Branched Aldehydes
(MDPI, 2023-03-16)
Aldehydes constitute a main class of organic compounds widely applied in synthesis. As such, catalyst-controlled enantioselective α-functionalization of aldehydes has attracted great interest over the years. In this context, ...
Reducing Negative Aging Stereotypes via Educational Intervention in Older People: A Randomized Controlled Study
(Sage, 2022-09-13)
Anti-ageism interventions traditionally target younger individuals. We analyzed the effect of an educational intervention that combined an infusion of aging content with videos to reduce negative stereotypes toward aging ...
Organocatalytic Michael Addition of Unactivated α-Branched Nitroalkanes to Afford Optically Active Tertiary Nitrocompounds
(ACS, 2023-11-27)
The direct, asymmetric conjugate addition of unactivated α-branched nitroalkanes is developed based on the combined use of chiral amine/ureidoaminal bifunctional catalysts and a tunable acrylate template to provide tertiary ...
Synthesis of 4,6-Difluoro-Tryptophan as a Probe for Protein 19F NMR
(Wiley-VCH GmbH, Weinheim, 2024-03-25)
A scalable procedure for the synthesis of 4,6-difluorotryptophan is reported based on a deaminative
coupling of a 4,6-difluorogramine with 2-benzylthio-1,5-dihydro-4H-imidazolone as glycine equivalent. Thus prepared ...
Development of an α’-hydroxy enone for the aminocatalytic asymmetric formal conjugate addition of aldehydes to acrylates, vinyl ketones and acrolein
(Royal Society of Chemistry, 2023-05-24)
Aminocatalytic asymmetric conjugate addition of aldehydes to Michael acceptors is a well established C–C bond forming methodology. However, various acrylic-type acceptors, including acrylic acid derivatives and acrolein, ...