Efforts towards the Identification of Simpler Platensimycin Analogues-The Total Synthesis of Oxazinidinyl Platensimycin
作者:Jingxin Wang、Vincent Lee、Herman O. Sintim
DOI:10.1002/chem.200802568
日期:2009.3.9
facile synthesis of an oxazinidinyl analogue of the antibiotic platensimycin is presented. Key steps of this work are a novel dynamic ring‐closing metathesis (RCM) that involves a base‐catalyzed epimerization followed by a tandem Ru‐catalyzed metathesis, and a nucleophilic addition to a ketone followed by a subsequent intramolecular epoxide ring‐opening reaction to construct the corestructure of the
Organocatalytic Transfer Hydrogenation of Cyclic Enones
作者:Jamison B. Tuttle、Stéphane G. Ouellet、David W. C. MacMillan
DOI:10.1021/ja0653066
日期:2006.10.1
The firstenantioselectiveorganocatalytic transfer hydrogenation of cyclic enones has been accomplished. The use of iminium catalysis has provided a neworganocatalyticstrategy for the enantioselective reduction of beta,beta-substituted alpha,beta-unsaturated cycloalkenones, to generate beta-stereogenic cyclic ketones. The use of imidazolidinone 4 as the asymmetric catalyst has been found to mediate
Hydride reduction of alpha, beta-unsaturated carbonyl compounds using chiral organic catalysts
申请人:MacMillan David
公开号:US20060161024A1
公开(公告)日:2006-07-20
Nonmetallic, chiral organic catalysts are used to catalyze the 1,4-hydride reduction of an α,β-unsaturated carbonyl compound. The α,β-unsaturated carbonyl compound may be an aldehyde or cyclic ketone, and the hydride donor may be a dihydropyridine. The reaction is enantioselective, and proceeds with a variety of hydride donors, catalysts, and substrates. The invention also provides compositions effective in carrying out the 1,4-hydride addition of α,β-unsaturated carbonyl compounds.
Hydride reduction of α,β-unsaturated carbonyl compounds using chiral organic catalysts
申请人:California Institute of Technology
公开号:US07323604B2
公开(公告)日:2008-01-29
Nonmetallic, chiral organic catalysts are used to catalyze the 1,4-hydride reduction of an α,β-unsaturated carbonyl compound. The α,β-unsaturated carbonyl compound may be an aldehyde or cyclic ketone, and the hydride donor may be a dihydropyridine. The reaction is enantioselective, and proceeds with a variety of hydride donors, catalysts, and substrates. The invention also provides compositions effective in carrying out the 1,4-hydride addition of α,β-unsaturated carbonyl compounds.