Ammonia → (4R,6R)-tert-Butyl-6-(2-aminoethyl)-2,2-dimethyl-1,3-dioxane-4-acetate

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A solution of (4R-cis)-1,1-dimethylethyl 6-cyanomethyl-2,2-dimethyl-1,3-dioxane-4-acetate (Example 5), 8.2 kg (30.5 mol) in 100 L of methanol containing 15 kg of anhydrous ammonia was reacted with hydrogen gas under 50 pounds per square inch (psi) at 30° C. in the presence of a slurry of 8 kg of Raney nickel doped with 1% molybdenum. After 6 hours, uptake of hydrogen had ceased, the mixture was cooled to 20° C., the atmosphere was vented and exchanged for nitrogen, and the slurry was filtered, concentrated by distillation and distilled under vacuum to give 7.8 kg of 96% pure (4R-cis)-1,1-dimethylethyl 6-(2-aminoethyl)-2,2-dimethyl-1,3-dioxane-4-acetate as a clear oil; bp 125-135° C. at 0.5 mm Hg.

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