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.
Reaction of opticallyactive cyclic allylsilanes, (S)-3-(trimethylsilyl)cyclopentene and -cyclohexene, which are prepared by palladium-catalyzed asymmetric hydrosilylation of cyclic dienes, with ethylene oxide in the presence of titanium chloride proceeded with anti stereochemistry to give (R)-3-(2-hydroxyethyl)cyclopentene and -cyclohexene, respectively.
Enantioselective glyoxylate-ene reaction using a novel spiro bis(isoxazoline) ligand in copper catalysis
作者:Kazuhiko Wakita、Gan B. Bajracharya、Midori A. Arai、Shinobu Takizawa、Takeyuki Suzuki、Hiroaki Sasai
DOI:10.1016/j.tetasy.2007.02.004
日期:2007.2
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.