Stereodivergent Total Syntheses of Precoccinelline, Hippodamine, Coccinelline, and Convergine^†

A stereodivergent approach toward total syntheses of Coccinellidae defensive alkaloids is described. These syntheses feature a highly
diastereoselective intramolecular aza-[3 + 3] annulation strategy, which represents a de novo approach to this family of natural products.