Results 101 to 110 of about 35,698 (262)
A Concise Total Synthesis of (--)-Maoecrystal Z [PDF]
, 2011 The first total synthesis of (--)-maoecrystal Z is described. The key steps of the synthesis include a diastereoselective Ti^(III)-mediated reductive epoxide coupling reaction and a diastereoselective Sm^(II)-mediated reductive cascade cyclization ...
Cha, Jacob Y. +2 more
core +2 more sources
Bayesian Optimization of Solvent‐Free Thermal Amidation via Reactive Extrusion
Chemistry – A European Journal, EarlyView.Thermal amidation between a carboxylic acid and an amine was successfully conducted in an extruder in the absence of solvent, coupling agent, or catalyst, relying on an adapted Bayesian Optimization protocol. Active pharmaceutical ingredient moclobemide was synthesized on a larger scale, achieving excellent yield and low Process Mass Intensity (PMI ...
Matthieu Lavayssiere +2 more
wiley +1 more source
Synthesis of Enantiopure Oxygen- and Nitrogen-Containing Heterocycles by Diastereoselective Ring-Closing Metathesis Reaction in Perhydro-1,3-benzoxazine Derivatives [PDF]
, 2019 Producción CientíficaDiastereoselective ring‐closing metathesis reactions on chiral trienic perhydro‐1,3‐benzoxazines derived from (−)‐8‐aminomenthol featuring two diastereotopic olefin chains is described.
Andrés Juan, Celia +4 more
core +2 more sources
Stable Cyclic Peterson Olefination Intermediates
Chemistry – A European Journal, EarlyView.We present the first synthesis and characterization of several stable cyclic Peterson olefination intermediates with four carbon bonded substituents at the silicon. The cyclic 1,2‐oxasiletanide intermediates were synthesized via the reaction of an α‐silyl carbanion with various ketones.
Julia Landwehrmann +3 more
wiley +1 more source
A General Strategy for the Synthesis of Jerangolids Enabled by π‐allyl Stille Coupling
Chemistry – A European Journal, EarlyView.A general strategy for the synthesis of jerangolids is established, featuring a late‐stage π‐allyl Stille coupling of two advanced, highly customizable building blocks to form the skipped diene core. The approach provides access to all naturally occurring jerangolids, including jerangolid H, whose configuration is confirmed by NMR analysis.
Janick Schug +2 more
wiley +1 more source
Iron-mediated Preparation of Vinylcyclopropanes. Scope, Mechanism, and Applications [PDF]
, 2003 The addition of stabilized carbon nucleophiles to tricarbonyl(1-methoxycarbonylpentadienyl)iron(1+) cation (1a) proceeds via attack at C2 on the face of the ligand opposite the Fe(CO)3 group to generate tricarbonyl(pentenediyl)iron complexes 2. Oxidation
Cao, Yeyu +3 more
core +1 more source
Chemistry – A European Journal, EarlyView.Dearomative homocoupling of quinolines into 1,1',2,2',3,3',4,4'‐octahydro‐4,4'‐biquinoline (OHBQ) is reported. The photoexcited boron complex, in situ generated from quinoline, HB(pin), and KOtBu, enables the unprecedented homocoupling of tetrahydroquinolines that is challenging in the ground state, expanding the chemical diversity of OHBQ derivatives.
Mone Suzuki +2 more
wiley +1 more source
NMR Characterization of Flavanone Naringenin 7-O-Glycoside Diastereomer
Chinese Journal of Magnetic Resonance, 2017 To discriminate R and S flavanone glycoside using NMR, the mixture of R and S naringenin 7-O-glycoside was first isolated from Gleditsia sinensis. 1H and 13C NMR data of the mixture were recorded with 1H NMR, 13C NMR, 1H-1H COSY, 1H-13C HSQC and 1H-13C ...
SUN Li-juan +5 more
doaj +1 more source
Sustainable Synthesis of 4,7‐Dihydro‐4,7‐ethano‐2H‐isoindoles—Key Building Blocks to Benzoporphyrins
Chemistry – A European Journal, EarlyView.A facile and sustainable route to isoindole derivatives—key benzoporphyrin precursors—brings high‐ and low‐symmetry benzoporphyrins closer to practical application. ABSTRACT Benzoporphyrins, π extended porphyrin analogues, exhibit remarkable potential for optoelectronic and theragnostic applications, yet have remained largely confined to fundamental ...
Lampros Pascal Gazetas +5 more
wiley +1 more source
A Novel Heterometallic Ring {Cr5Ni3} and New {Cr6Co2} and {Cr6Zn2} Rings
Chemistry – A European Journal, EarlyView.A novel heterometallic ring containing five Cr(III) and three Ni(II) centers is reported. It forms an octagon and has a single isomer, as revealed by a combination of magnetic and EPR studies and collision‐induced dissociation mass spectrometry. ABSTRACT A new heterometallic ring, [Me4N][(Me4N)2Cr5Ni3F8(BTFB)16] (BTFB = 3,5‐bis(trifluoromethyl)benzoate)
Abdulelah Alsuhaymi +9 more
wiley +1 more source