Chemoselective oxidation of organozinc reagents with oxygen
作者:Ingo Klement、Henning Lütjens、Paul Knochel
DOI:10.1016/s0040-4020(97)00603-0
日期:1997.7
Functionalized organozinc compounds prepared by hydrozincation, carbozincation or by boron-zincexchange can be directly oxidized in a selective manner to the corresponding functionalized alcohols or hydroperoxides depending on the reaction conditions.
An Efficient Protocol for the Cross-Metathesis of Sterically Demanding Olefins
作者:Zhen J. Wang、W. Roy Jackson、Andrea J. Robinson
DOI:10.1021/ol401194h
日期:2013.6.21
Cross-metathesis of a wide range of previously unreactive, sterically demanding alkenes can be achieved In fair to excellent yield using a commercially available catalyst by a facile strategy involving reversal of steric preference.
Rearrangement of methylenecamphor during electrophilic bromination: remarkably clean access to the unnatural fenchyl (1,3,3-trimethylbicyclo[2.2.1]heptane) system
作者:Allen A Thomas、Keith A Monk、Sonia Abraham、Stella Lee、Charles M Garner
DOI:10.1016/s0040-4039(01)00089-2
日期:2001.3
Treatment of (+)-methylenecamphor (2) with NBS in the presence of pyridine resulted in a rapid and remarkably clean rearrangement to yield a brominated (+)-methylenefenchone (3) in high yield and purity (>96%). The structure of the product was established by X-ray crystallography and the stereochemistry confirmed by both polarimetric and chiral GC analyses. Two transformations of the product were also performed to elucidate the structure. (C) 2001 Elsevier Science Ltd. All rights reserved.
Effective methods of carbonyl methylenation using CH2I2-Zn-Me3Al and CH2Br2-Zn-TiCl4 system
Structurally Biased 2-Fluoroallyl Cations as Generated - or not Generated - in Cyclopropane Ring-opening Reactions
作者:Manfred Schlosser、Yvonne Bessière
DOI:10.1002/hlca.19770600232
日期:1977.3.9
The silver ion-catalysed ring-opening of 2-t-butyl-1-chloro-1-fluoro-2-methyl-cyclopropane (see Scheme 2) gave the expected mixture of primary and tertiary fluoroalkenols, whereas a tricyclic analog (bornane-spiro-chlorofluorocyclopropane) (see Scheme 3) exclusively underwent a Wagner/Meerwein rearrangement upon ionization to lose finally a proton affording a 2-fluoro-1,4-diene.