“…The solvent was removed under vacuum and the residue purified by flash chromatography (EtOAc‐hexane, 2:1→EtOAc) to furnish the title compound 10 as a clear oil, yield: 77 mg (57%). The spectroscopic data of compound 10 were in good agreement with the literature data 36. [ α ] D : + 58.4 ( c 0.51, CHCl 3 ), lit36 [ α ] D ( ent ): −63.2 ( c 1.0, CHCl 3 ); 1 H NMR (300 MHz, CDCl 3 ): δ =4.54–4.56 (1 H, m), 4.22 (1 H, d, J =5.4 Hz), 2.41–2.47 (1 H, m), 2.13–2.27 (2 H, m), 1.84–1.93 (3 H, m), 1.38 (3 H, s), 1.33 (3 H, s).…”