Asymmetric Michael additions catalysed by Ni(II) and Co(II) complexes with homochiral ligands
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Recent developments in enantioselective cobalt-catalyzed transformations
2018, Coordination Chemistry ReviewsCitation Excerpt :This result could suggest that the selective recognition to ortho-substituted benzaldehydes was ascribed to the difference in the molecular size of aromatic aldehydes and possible aromatic–aromatic interaction between the phenyl rings of the ligand and the aromatic ring of aldehydes. In 2016, Yashima and co-workers reported the synthesis of a novel double-helical bimetallic cobalt salen complex 112 stabilized by chiral amidinium–carboxylate salt bridges to catalyze the asymmetric Henry reaction of o-methoxybenzaldehyde 109a and nitromethane [73]. As shown in Scheme 39, the corresponding Henry product 111a was obtained in both high yield (91%) and enantioselectivity (89% ee) when the reaction was performed with 4 mol% of this catalyst in dichloromethane at −30 °C in the presence of DIPEA as base.
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