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C. Nmr, CDCl 3 ) ? 168, MHz, vol.9, issue.1339

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. Equiv, DCM (55 mL) and water (35 mL) yielded the desired crude product. Purification by flash column chromatography (eluent PE/AcOEt 80:20 then 70:30 then 60:40) provided the desired compound as a colorless oil, p.70

. Equiv, DCM (3 mL) was added TFA (0.5 mL, 6.42 mmol, 5 equiv.) at r.t. and the resulting solution 1

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