Results 211 to 220 of about 200,870 (399)

In Situ Light‐driven pH Modulation for NMR Studies

open access: yesAngewandte Chemie, EarlyView.
In this work, we introduce a novel approach to control pH in NMR samples using light‐activated photoacids. By combining light stimuli with pH‐sensitive molecules, we demonstrate the ability to precisely modulate pH without physically manipulating the sample.
Aarav Barde   +6 more
wiley   +2 more sources

The coli-tryptophan-indole reaction [PDF]

open access: green, 1935
Frank Charles Happold, L. Hoyle
openalex   +1 more source

Concise Total Syntheses of Leuconoxine‐Type Alkaloids Enabled by Palladium/Norbornene‐Catalyzed Pyrrole Difunctionalization

open access: yesAngewandte Chemie, EarlyView.
Concise total syntheses of five leuconoxine alkaloids have been achieved using a pyrrole‐centered strategy, which features a newly developed palladium/norbornene‐catalyzed pyrrole double C─H functionalization method, a divergent late‐stage oxidative dearomatization tactic, and no use of protecting groups.
Xin Liu   +5 more
wiley   +2 more sources

Augmented indoles

open access: yesARKIVOC, 2006
David StC. Black   +7 more
doaj   +1 more source

Synthesis of new N-Benzoxazole and N-Benzothiazole derivatives of 3-(4-Substituted- phenyl)aminoisoxazol-5(2H)-ones and comparison of their base induced rearrangement

open access: yesJournal of the Brazilian Chemical Society, 2006
3-Arylaminoisoxazol-5(2H)-ones, substituted on nitrogen with benzoxazole and benzothiazole groups react with triethylamine in ethanol under reflux to afford the corresponding indole and imidazobenzothiazole derivatives, respectively.
Khalafy Jabbar   +2 more
doaj  

Basizität im angeregten Zustand verändert die Selektivität der aromatischen Deuterierung: Anwendung auf die Late‐Stage Markierung von Pharmazeutika

open access: yesAngewandte Chemie, EarlyView.
Wir präsentieren eine metallfreie Methode für die Deuteriummarkierung von Aromaten in deuteriertem HFIP. Dieser Ansatz nutzt die erhöhte Basizität von Aromaten im angeregten Zustand, um den selektiven Wasserstoffisotopenaustausch an schwer zugänglichen Positionen zu ermöglichen.
Eva Rivera‐Chao   +5 more
wiley   +1 more source

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