Abstract
[structure: see text] The BINOL-Salen compound (-)-1 can catalyze the addition of both aryl- and alkylalkynes to aromatic aldehydes at room temperature with high enantioselectivity (86-97% ee). The conditions for this catalytic process are both mild and simple. Unlike most other BINOL-based catalysts, using ligand (-)-1 not only avoids heating or cooling but also does not require the addition of Ti(O(i)Pr)(4).
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