Triisopropyl phosphite → HCID 67076954, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of preparation 4 (198 mg, 0.64 mmol) and Pd(OAc)2 (17 mg, 0.076 mmol) in 4 mL THF add 2-(acetoxymethyl)allyl-trimethylsilane (0.163 mL, 0.122 mmol) followed by triisopropyl phosphite (0.12 mL, 0.49 mmol). After stirring at 60° C. overnight, cool the solution to room temperature, concentrate under reduced pressure, and dilute with EtOAc. Wash the solution with saturated aqueous sodium bicarbonate and brine. Dry over Na2SO4, and then concentrate to an oil. Purify the material by silica gel chromatography (10 g, 10 to 30% EtOAc/Hex over 30 min at 35 mL/min) to give 80 mg (0.208 mol, 63%) of preparation 6 and 30 mg (0.091 mmol, 27%) of recovered starting material. 1H NMR (400 MHz, CDCl3) δ 7.48-7.36 (m, 6H), 7.01 (d, 1H, J=3.1 Hz), 5.10 (s, 2H), 5.01 (m, 2H), 3.97 (s, 3H), 3.43 (dt, 1H, J=7.5, 3.1 Hz), 3.21-3.10 (m, 2H), 2.86-2.74 (m, 2H), 2.43 (m, 1H).

Provenance & Evidence