Reaction Steps
To a solution of tert-butyl((3S,7R,8R,9S)-7-(2-hydroxyethyl)-9-methyl-2-oxo-8-phenoxyoxonan-3-yl)carbamate (250 mg, 0.613 mmol) in CH2Cl2 (6.1 mL) at 0° C. was added Dess-Martin periodinane (286 mg, 0.675 mmol). The resulting mixture was stirred at 0° C. for 2 h, quenched with sat. aqueous sodium thiosulfate (Na2S2O3; 3 mL) and sat. aqueous NaHCO3 (3 mL) solution, and then removed from the cold bath and stirred vigorously for 10 min. The phases were separated and the aqueous phase was extracted with CH2Cl2 (2×6 mL) and the combined organic extracts were dried over Na2SO4, filtered, and concentrated to provide the title compound as a fluffy white foam (255.4 mg, 98%): 1H NMR (400 MHz, CDCl3) δ 9.65 (t, J=1.7 Hz, 1H), 7.29 (dd, J=8.7, 7.4 Hz, 2H), 7.02-6.93 (m, 1H), 6.88 (d, J=7.9 Hz, 2H), 5.23-5.08 (m, 2H), 4.30-4.10 (m, 2H), 2.60 (dd, J=16.0, 5.4 Hz, 1H), 2.44 (d, J=6.4 Hz, 1H), 2.38-2.21 (m, 2H), 1.73 (ddd, J=19.5, 13.8, 9.2 Hz, 3H), 1.44 (s, 9H), 1.37-1.22 (m, 5H); 13C NMR (101 MHz, CDCl3) δ 200.78, 173.29, 158.65, 154.90, 129.80, 129.73, 121.59, 115.23, 80.63, 79.98, 74.23, 53.28, 46.09, 36.71, 33.64, 31.78, 28.33, 19.72, 18.18; ESIMS m/z 428.2 ([M+Na]+).
