Enantioselective glyoxylate-ene reaction using a novel spiro bis(isoxazoline) ligand in copper catalysis
摘要:
Novel chiral spiro bis(isoxazoline) ligands 3 and 4 are synthesized from an optically active olefin. The Cu(II)-spiro bis(isoxazoline) complex prepared in situ from Cu(OTf)(2) and 3 promoted the glyoxylate-ene reaction in high yield and moderate enantioselectivity (up to 70%). (c) 2007 Published by Elsevier Ltd.
Enantioselective glyoxylate-ene reaction using a novel spiro bis(isoxazoline) ligand in copper catalysis
摘要:
Novel chiral spiro bis(isoxazoline) ligands 3 and 4 are synthesized from an optically active olefin. The Cu(II)-spiro bis(isoxazoline) complex prepared in situ from Cu(OTf)(2) and 3 promoted the glyoxylate-ene reaction in high yield and moderate enantioselectivity (up to 70%). (c) 2007 Published by Elsevier Ltd.
Rules for ring-fusion geometry and the preparation of trans- or cis-fused bicyclic compounds by radical closure
作者:Derrick L. J. Clive、David R. Cheshire、Lu Set
DOI:10.1039/c39870000353
日期:——
Aldol condensation with (phenylseleno)acetaldehyde and radical cyclization leads to cis-fusedbicycliccompounds when applied (Scheme 1) to esters of cycloalk-2-enylacetic acid; trans-isomers are formed when the reactions are used (Scheme 2) in conjunction with organocuprate-mediated addition to cycloalkenones.