Journal
ORGANOMETALLICS
Volume 29, Issue 12, Pages 2831-2834Publisher
AMER CHEMICAL SOC
DOI: 10.1021/om100331z
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Funding
- Shanghai Municipal Committee of Science and Technology [06XD14005, 08dj1400100-2]
- National Basic Research Program of China [973-2010CB833302]
- National Natural Science Foundation of China [20902019, 20872162, 20672127, 20821002, 20732008, 20702059]
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The asymmetric addition of cyclic beta-keto esters to activated olefins and N-Boc imines was realized by using chiral cationic C-2-symmetric N-heterocyclic carbene (NHC) Pd2+ diaqua complexes 1a,b as the catalysts, producing the corresponding adducts in moderate to high yields (up to 95%) and with good to high entail ioselectivities (up to 96% ee). Nevertheless, the most significant observation is that when the (R)-NHC Pd2+ complex was used in these reactions, different absolute configurations were observed in comparison to those obtained with catalysts obtained from (R)-phosphane ligands.
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