Nitro-Substituted Aryl Lithium Compounds in Microreactor Synthesis: Switch between Kinetic and Thermodynamic Control
作者:Aiichiro Nagaki、Heejin Kim、Jun-ichi Yoshida
DOI:10.1002/anie.200904316
日期:2009.10.12
Be quick or take your time, depending on your goal: A microflow method for the generation and transformation of o‐, m‐, and p‐nitro‐substituted aryl lithium compounds enabled the selective use of either the kinetically or the thermodynamically preferred intermediate. In the example pictured, a residence time of 0.06 s at −48 °C led to the formation of 1, whereas 2 was obtained exclusively when the
There is an increasing demand for facile delivery of silyl groups onto organic bioactive molecules. One of the common methods of silylation via a transition-metal-catalyzed coupling reaction employs hydrosilane, disilane, and silylborane as major silicon sources. However, the labile nature of the reagents or harsh reaction conditions sometimes render them inadequate for the purpose. Thus, a more versatile
Organoarsenic probes to study proteins by NMR spectroscopy
作者:Mithun C. Mahawaththa、Henry W. Orton、Ibidolapo Adekoya、Thomas Huber、Gottfried Otting、Christoph Nitsche
DOI:10.1039/d1cc06497e
日期:——
Arsenical probes enable structural studies of proteins. We report the first organoarsenic probes for nuclear magnetic resonance (NMR) and electron paramagnetic resonance (EPR) spectroscopy to studyproteins in solutions. These probes can be attached to irregular loop regions. A lanthanide-binding tag induces sizable pseudocontact shifts in proteinNMR spectra of a magnitude never observed for small
Silylative decarbonylation: a new route to arylsilanes
作者:Jonathan D. Rich
DOI:10.1021/ja00197a058
日期:1989.7
procedure is tolerant of a variety of aromatic substituents, for example, alkyl, halo, nitro, cyano, imide, acid anhydride, etc., and the synthesis of several new substituted aromatic chlorosilanes containing benzoyl chloride and phthalic anhydride moieties is described. Chloromethyldisilane starting reagents are available from the direct reaction of methyl chloride and silicon, making this methodology
Pd-catalyzed reductive denitration of nitroarenes has been achieved via a direct cleavage of the C–NO2 bonds. The catalytic conditions reported exhibit a broad substrate scope and good functional-group compatibility. Notably, the use of inexpensive propan-2-ol as a mild reductant suppresses the competitive formation of anilines, which are normally formed by other conventional reductions. Mechanistic