Two metal cooperation: A homodinuclear Co2–Schiff base complex Co2(OAc)2–1 promoted the asymmetric 1,4-addition of β-keto esters to alkynones under solvent-free conditions in air (see scheme). The reactions proceeded without air or moisture sensitivity in high yields and with high enantioselectivities (99–91 % ee) at room temperature under highly concentrated conditions (neat–20 M) with 0.1–2.5 mol % catalyst loading.
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