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A solution of 12.72 g (120 mmol) of sodium carbonate is placed in 120 mL of water and combined with a solution of 7.00 g (38 mmol) of 4-(2-methyl-[1,3]dioxolan-2-yl)cyclohexylamine (cis/trans mixture) in 50 g of dioxane. After cooling to 0° C., a solution of 10.09 g (39 mmol) of Fmoc-chloride in 100 g of dioxane is added dropwise within 0.2 hours. The reaction mixture is stirred for 16 hours with the cooling removed. Then the mixture is poured onto water and extracted with ethyl acetate. The organic phase is washed with water, dried, and evaporated to dryness. The residue is purified by chromatography. Yield: 13.10 g (85%) cis/trans ratio 4:1; NMR: LH201618.

1. customremoved
2. additionThen the mixture is poured onto water
3. extractionextracted with ethyl acetate
4. washThe organic phase is washed with water
5. customdried
6. customevaporated to dryness
7. customThe residue is purified by chromatography