Enantioselective Synthesis of Substituted Indanones from Silyloxyallenes
摘要:
A new approach for the synthesis of enantioenriched indanones by asymmetric carbonyl-ene/intramolecular Heck cyclization from racemic silyloxyallenes has been developed. The modular procedure affords highly substituted indenes and indanones with excellent chirality transfer from the optically active carbinols. Full transfer of stereochemical information is achieved in the presence of 1,2,2,6,6-pentamethylpiperidine and PdCl2(PPh3)(2) (1 mol %) in DMF under microwave heating. Short reaction times and high yields have been demonstrated on a variety of substrates.
Lewis Acid-Catalyzed Conjugate Additions of Silyloxyallenes: A Selective Solution to the Intermolecular Rauhut−Currier Problem
作者:Troy E. Reynolds、Michael S. Binkley、Karl A. Scheidt
DOI:10.1021/ol800745q
日期:2008.6.1
10 mol % Sc(OTf) 3. The reaction delivers intermolecularRauhut-Currier products in excellent yields and regioselectivities for a wide scope of substrates. Notably, the formal cross-coupling of two different alpha,beta-unsaturated carbonyl compounds (a cross Rauhut-Currierreaction) is achieved. Preliminary investigations have demonstrated good levels of enantioselectivity for the addition of a racemic
Catalytic Enantioselective α-Acylvinyl Anion Reactions of Silyloxyallenes
作者:Troy E. Reynolds、Karl A. Scheidt
DOI:10.1002/anie.200702818
日期:2007.10.15
Enantioselective Synthesis of Substituted Indanones from Silyloxyallenes
作者:Jonathan A. Brekan、Troy E. Reynolds、Karl A. Scheidt
DOI:10.1021/ja909669e
日期:2010.2.10
A new approach for the synthesis of enantioenriched indanones by asymmetric carbonyl-ene/intramolecular Heck cyclization from racemic silyloxyallenes has been developed. The modular procedure affords highly substituted indenes and indanones with excellent chirality transfer from the optically active carbinols. Full transfer of stereochemical information is achieved in the presence of 1,2,2,6,6-pentamethylpiperidine and PdCl2(PPh3)(2) (1 mol %) in DMF under microwave heating. Short reaction times and high yields have been demonstrated on a variety of substrates.