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Examples 2t and 2u, Step 2: A solution of benzyl (1S,2S,4R)-4-hydroxy-2-((Z)-prop-1-enyl)cyclohexylcarbamate (6.0 g, 20.7 mmol) in methylene chloride (60 mL) was treated with imidazole (2.1 g) and cooled to 0° C. The resultant solution was charged with tert-butylchlorodimethylsilane (3.4 g, 22.8 mmol) and then stirred for 18 h at 30° C. before being quenched with water. The organic phase was separated, and the aqueous phase was extracted with methylene chloride. The combined organic phases were washed with brine, dried, filtered, and concentrated in vacuo. The residue was purified by flash chromatography to afford benzyl (1S,2S,4R)-4-(tert-butyldimethylsilyloxy)-2-((Z)-prop-1-enyl)cyclohexylcarbamate (6.0 g). MS found: (M+H)+=404.

1. custombefore being quenched with water
2. customThe organic phase was separated
3. extractionthe aqueous phase was extracted with methylene chloride
4. washThe combined organic phases were washed with brine
5. customdried
6. filtrationfiltered
7. concentrationconcentrated in vacuo
8. customThe residue was purified by flash chromatography