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Prolinol–phosphine chiral ligands enabled highly enantioselective copper‐catalyzed intermolecular alkyne–nitrone coupling (Kinugasa reaction) to produce 1,3,4‐trisubstituted chiral β‐lactams. A high level of enantiocontrol was achieved not only with aryl‐ or alkenylacetylenes but also with alkylacetylenes, which were important but unfavorable substrates in the previously reported protocols. Two‐point...
Catalyst–substrate hydrogen bonds in artificial catalysts usually occur in aprotic solvents, but not in protic solvents, in contrast to enzymatic catalysis. We report a case in which ligand–substrate hydrogen‐bonding interactions cooperate with a transition‐metal center in alcoholic solvents for enantioselective catalysis. Copper(I) complexes with prolinol‐based hydroxy amino phosphane chiral ligands...
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