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note
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Typical Mukaiyama aldol addition procedure: To a dry 5-mL round-bottomed flask fitted with a septum was added anhydrous scandium(III) triflate (14 mg, 0.030 mmol) and 3.0 mL of anhydrous dichloromethane. Vinyldiazoacetate 2 (564 mg, 2.20 mmol) was then added dropwise over 5 min, using a 1 mL syringe, followed by aldehyde (1.50 mmol). The reaction mixture was stirred at room temperature for 10 h, during which time the color of the solution changed from orrange to pale yellow. (The reactions with 1a and 1c were found to be incomplete after 6 h.) The product was isolated by flash column chromatography on silica gel, eluting with 9:1 hexane/ethyl acetate.
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note
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3 produced 77% 3a, 77% 3b, 75% 3c, and 72% 3d.
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