Diastereoselective cobalt-catalyzed alkylative aldol cyclizations using trialkylaluminum reagents.

[摘要]：Co(acac)2?H2O serves as an effective precatalyst for alkylative aldol cyclizations of a,b-unsatd. amides with ketones using trialkylaluminum reagents. These reactions provide b-hydroxylactams, e.g., I, contg. three contiguous stereocenters with high levels of diastereoselection.

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