Copper(I) chloride catalyzed chlorine atom transfer radical cyclization reactions of a series of olefinic alpha-chloro beta-keto esters were investigated. It was found that alpha-dichlorinated beta-keto esters were suitable substrates; the chlorine transfer mono or tandem radical cyclization reactions catalyzed by CuCl complex with bis(oxazoline) or bipyridine proceeded smoothly in dichloroethane at
Synthetic studies directed toward the proposed structure for heteroscyphic acid A
作者:Subhabrata Chaudhury、Shukun Li、William A. Donaldson
DOI:10.1039/b602700h
日期:——
A route to the carbon skeleton of the proposedstructure for heteroscyphic acid A was developed utilizing a Mn(III)/Cu(II) mediated oxidative free-radical cyclization and nucleophilic addition to (3-methylpentadienyl)iron(1+) cation.
Lewis Acid Promoted Phenylseleno Group Transfer Tandem Radical Cyclization Reactions
作者:Dan Yang、Qiang Gao、On-Yi Lee
DOI:10.1021/ol025750n
日期:2002.4.1
[reaction: see text] A new Lewis acid promoted phenylseleno group transfer tandem radical cyclization method was developed. In the presence of Lewis acids such as Yb(OTf)3 or Mg(ClO4)2, under photolysis condition at low temperature (-45 degrees C), various unsaturated alpha-phenylseleno beta-keto amides underwent radical cyclization reactions to give monocyclic or bicyclic products in a highly efficient