Methyl morpholine oxide → (2s,5r)-2-((1r,3Ar,4s,7ar)-4-{[tert-butyl(dimethyl)silyl]oxy}-7a-methyloctahydro-1h-inden-1-yl)-5,6-dimethyl-6-[(trimethylsilyl)oxy]heptan-3-ol

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The compound of Example 10E (200 mg, 0.61 mmol) was dissolved in 2 mL of dichloromethane; 100 mg of 4 Å molecular sieves were added, followed by 15 mg of tetrapropylammonium perruthenate and 75 mg of 4-methylmorpholine N-oxide. The mixture was stirred for 2 hours at ambient temperature, and then filtered through diatomaceous earth to removed solids. The crude product was purified by silica gel chromatography using an Analogix IntelliFlash™ 40, eluting with a gradient of 5% to 30% ethyl acetate in hexanes. The compound of Example 10C (200 mg, 0.63 mmol) was combined with this aldehyde according to the coupling procedure described by Kutner et al. in J. Org. Chem. 1988, 53, 3450-3457. The named product, the result of desulfurization without elimination, was isolated after chromatographic purification using an Analogix Intelliflash 280™, eluting with a gradient of 0% to 50% ethyl acetate in hexanes.

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