Novel rhenium(i) catalysts for the isomerization of propargylic alcohols into α,β-unsaturated carbonyl compounds: an unprecedented recyclable catalytic system in ionic liquids
作者:Joaquín García-Álvarez、Josefina Díez、José Gimeno、Christine M. Seifried
DOI:10.1039/c1cc10768b
日期:——
Carbonyl rhenium(I) complexes are efficient catalysts for the regioselective isomerization of terminal propargylic alcohols into α,β-unsaturated aldehydes or ketones which can be used as an unprecedented recyclable catalytic system (up to 10 consecutive runs) in the ionic liquid [BMIM][PF6].
Deep eutectic solvent-catalyzed Meyer–Schuster rearrangement of propargylic alcohols under mild and bench reaction conditions
作者:Nicolás Ríos-Lombardía、Luciana Cicco、Kota Yamamoto、José A. Hernández-Fernández、Francisco Morís、Vito Capriati、Joaquín García-Álvarez、Javier González-Sabín
DOI:10.1039/d0cc06584f
日期:——
The Meyer–Schuster rearrangement of propargylic alcohols into α,β-unsaturated carbonyl compounds has been revisited by setting up an atom-economic process catalyzed by a deep eutectic solvent FeCl3·6H2O/glycerol. Isomerizations take place smoothly, at room temperature, under air and with short reaction times. The unique solubilizing properties of the eutectic mixture enabled the use of a substrate
通过建立由低共熔溶剂FeCl 3 ·6H 2 O /甘油催化的原子经济过程,重新探讨了炔丙醇向α,β-不饱和羰基化合物的Meyer-Schuster重排。异构化可在室温,空气,短反应时间内平稳进行。低共熔混合物独特的增溶性能使其能够使用浓度高达1.0 M的底物,并且将介质循环使用多达十次,而不会损失任何催化活性。
One-Pot Synthesis of Spirocyclopenta[<i>a</i>]indene Derivatives via a Cascade Ring Expansion and Intramolecular Friedel–Crafts-Type Cyclization
作者:Quanzhe Li、Jiaxin Liu、Yin Wei、Min Shi
DOI:10.1021/acs.joc.9b03126
日期:2020.2.21
A one-pot efficient synthetic approach for the rapid construction of spirocyclopenta[a]indene derivatives has been developed via an iodine-initiated cascade ring expansion and intramolecular Friedel-Crafts-type cyclization from propargyl alcohol-tethered alkylidenecyclobutanes under mild conditions with broad substrate scope. This cascade process can be elegantly conducted on a gram scale. A plausible
Modulation of Spectrokinetic Properties of<i>o</i>-Quinonoid Reactive Intermediates by Electronic Factors: Time-Resolved Laser Flash and Steady-State Photolysis Investigations of Photochromic 6- and 7-Arylchromenes
作者:Jarugu Narasimha Moorthy、Apurba L. Koner、Subhas Samanta、Ankur Roy、Werner M. Nau
DOI:10.1002/chem.200801925
日期:2009.4.20
cleavage to yield colored o‐quinonoid intermediates. A combined analysis of μs–ms (laserflash) and real‐time kinetic data show that the o‐quinonoid intermediates decay faster when the C2‐aryl and C6‐/C7‐aryl rings contain electron‐donating and electron‐accepting groups, respectively. Similarly, the decay occurs slowly for the reversed scenario, while intermediate decay rates are observed when both substituents
Synthesis and biological evaluation of novel N-substituted nipecotic acid derivatives with an alkyne spacer as GABA uptake inhibitors
作者:Krisztián Tóth、Georg Höfner、Klaus T. Wanner
DOI:10.1016/j.bmc.2018.05.049
日期:2018.7
In this study, we present the synthesis and structure–activity relationships (SAR) of novel N-substituted nipecotic acidderivatives closely related to (S)-SNAP-5114 (2) in the pursuit of finding new and potent mGAT4 selective inhibitors. By the use of iminium ion chemistry, a series of new N-substituted nipecotic acidderivatives containing a variety of heterocycles, and an alkyne spacer were synthesized