Journal
RSC ADVANCES
Volume 4, Issue 71, Pages 37859-37867Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ra06056c
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Funding
- National Natural Science Foundation of China (NSFC) [21173064, 51203037]
- Zhejiang Provincial Natural Science Foundation of China [LR14B030001]
- Program for Excellent Young Teachers in Hangzhou Normal University (HNUEYT) [JTAS 2011-01-014]
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A new type of chiral salen-Co catalyst that features aromatic p-walls and an active Co(III) center has been developed for enantioselective Henry/nitroaldol reactions on the basis of salen-Cu catalysis. The asymmetric Henry reaction of aromatic aldehydes and nitromethane catalyzed by an Ar-BINMOL derived salen-Co(III) complex was achieved with high yields (up to 93%) and excellent enantioselectivities (up to 98% ee). And more interestingly, it was supposed that either salan-Cu(II) or salen-Co(III) complex catalyzed Henry reaction was an ideal model reaction for providing direct evidence of noncovalent interaction due to the distinguishable ortho-substituted aromatic aldehydes from meta-or parasubstituted benzaldehydes in terms of enantioselectivities and yields.
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