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Silicon Lewis acid 3 is effective for the promotion of highly enantioselective cycloaddition reactions of acylhydrazones with Danishefsky's diene (formal aza-Diels–Alder reactions). The reactions are conducted at ambient temperature for 15min, and produce the products in good yield and with high levels of enantioselectivity. A remarkable solvent-dependent reversal in the sense of absolute stereochemical...
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