Three new general, simple and convenient procedures of intramolecular homolyticaromaticsubstitution leading to homocyclic and heterocyclic compounds have been developed by addition of aryl or nucleophilic alkyl radicals to alkenes conjugated with electron-withdrawing groups in the presence of metal salt redox systems.
HYDROXYMETHYL PYRROLIDINES AS BETA 3 ADRENERGIC RECEPTOR AGONISTS
申请人:Berger Richard
公开号:US20090253705A1
公开(公告)日:2009-10-08
The present invention provides compounds of Formula (I), pharmaceutical compositions thereof, and method of using the same in the treatment or prevention of diseases mediated by the activation of β3-adrenoceptor.
Et<sub>2</sub>Zn-Mediated Rearrangement of Bromohydrins
作者:Lezhen Li、Peijie Cai、Qingxiang Guo、Song Xue
DOI:10.1021/jo800231s
日期:2008.5.1
and highly efficient method for the rearrangement of bromohydrins mediated by Et2Zn to synthesize carbonylcompounds was described. Various β-bromo alcohols were treated with 0.6 equiv of Et2Zn to form a zinc complex in CH2Cl2 at room temperature for 2 h, followed by 1,2-migration to give the corresponding carbonylcompounds. This remarkable and clean rearrangement is general for acyclic and cyclic bromohydrins
for hydrogenation of polycyclicaromatichydrocarbons (PAHs) containing 2–4 rings undermild reaction conditions. These compounds were partially hydrogenated with good to excellent selectivities just by optimizing the reaction conditions. The influence of the nature of substituents present in different positions of naphthalene on the selectivity of hydrogenation was also studied. Hydrogenation of products
Oxidative rearrangement of alkenes using in situ generated hypervalent iodine(III)
作者:Anees Ahmad、Paulo Scarassati、Nazli Jalalian、Berit Olofsson、Luiz F. Silva
DOI:10.1016/j.tetlet.2013.08.012
日期:2013.10
A novel protocol for the oxidativerearrangement of alkenes using in situ generated hypervalent iodine(III) was developed. This approach uses inexpensive, readily available, and stable chemicals (PhI, mCPBA, and TsOH) giving rearrangement products in yields comparable to those obtained using the more expensive commercially available [hydroxy(tosyloxy)iodo]benzene [HTIB or Koser’s reagent]. Additionally