Traceless Chiral Auxiliaries for the Allene Ether Nazarov Cyclization
摘要:
The key stereochemical factors that determine transfer of asymmetry from the chiral auxiliary to the cyclopentenone in the allene ether version of the Nazarov reaction have been elucidated. On the basis of the new insights into the mechanism, two highly effective chiral auxiliaries were designed and prepared.
An Improved Chiral Auxiliary for the Allene Ether Version of the Nazarov Cyclization
作者:Derrick B. delos Santos、April R. Banaag、Marcus A. Tius
DOI:10.1021/ol060816q
日期:2006.6.1
alpha-2-Deoxy-D-glucose derived ether 14 is a superior reagent for the allene ether version of the Nazarov cyclization. Enantiomeric excesses of products derived from trisubstituted morpholino enamides varied between 85% and 93% ee.