The synthesis of two new fluorescent hemicryptophanes is reported. They were found to be efficient and selective receptors for acetylcholine over choline. When compared to other hemicryptophane hosts previously reported for the selectiverecognition of acetylcholine, they display improved fluorescent properties: their maximum emission wavelengths are red-shifted and the quantum yields are higher. NMR
Catalytic Cycloisomerization of Enyne Diesters Derived From 2‐Propargyloxyarylaldehydes
作者:Manoj Kumar Saini、Shashi Kant Verma、Ashok K Basak
DOI:10.1002/adsc.202200026
日期:2022.3.15
A catalytic cycloisomerization of enyne diesters derived from 2-propargyloxyarylaldehydes is described. The cycloisomerization, catalyzed by 10 mol% In(OTf)3, provides access to 2H-chromenes bearing diethyl 2-(hetero)arylidene malonates at 3-position. This enyne metathesis-type reaction is also useful for the synthesis of thia-, aza- and quinoline analogs of the 3-substituted 2H-chromenes. DDQ mediated
Pd embedded in chitosan microspheres as tunable soft-materials for Sonogashira cross-coupling in water–ethanol mixture
作者:Sana Frindy、Ana Primo、Mohamed Lahcini、Mosto Bousmina、Hermenegildo Garcia、Abdelkrim El Kadib
DOI:10.1039/c4gc02175d
日期:——
Easy shaping of chitosan (CS) as self-standing microspheres and functionalisation of its amino groups afford heterogeneous Pd-supported catalysts for Sonogashira cross-coupling.
describe a novel intramolecular double hydrofunctionalization cyclization of alkyne with nitrogen and oxygen nucleophilic groups to construct valuable 6/7/5-fused heterocyclic products. This post-Groebke–Blackburn–Bienaymé (GBB) reaction introduces a new class of functionalized isocyanides. Transition-metal-free cyclization, broad substrate scope, and high atom economy were some features of the present