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Palladium on carbon (10 wt. %, 1 mg) was added to a mixture of 12 and 13 (10 mg, ˜0.022 mmol) in EtOAc (0.42 mL). A hydrogen atmosphere was established by evacuating and refilling with hydrogen (10×) and the reaction mixture was stirred under a balloon of hydrogen for 6 h. The reaction mixture was filtered through celite, washing with EtOAc, and the filtrate was concentrated in vacuo. Purification of the resulting crude residue by flash column chromatography on silica gel (10% MeOH/CH2Cl2) afforded 7 mg (˜68%) of ester 14 and 2.7 mg (30%) of title compound 15.

1. customby evacuating
2. filtrationThe reaction mixture was filtered through celite
3. washwashing with EtOAc
4. concentrationthe filtrate was concentrated in vacuo
5. customPurification of the resulting crude residue by flash column chromatography on silica gel (10% MeOH/CH2Cl2)