Diisobutylaluminum hydride → HCID 10431207, compound

Participants

Reaction Conditions

Reaction Steps

To 100 mg (0.28 mmol) of 1-9 in 3 mL of DMF at 0° C. was added 20 mg of NaH (0.6 mmol of a 60% suspension in oil), followed by 80 μL (0.6 mmol) of tert-butyl bromoacetate. After stirring for 2 h at 0° C., the reaction was quenched with a saturated NH4Cl solution, and extracted twice with EtOAc. The combined organic layers were then washed with brine, dried over Na2SO4, concentrated, and the residue purified by silica gel chromatography with EtOAc/hexanes to provide a colorless oil. This residue was dissolved in 10 mL of CH2Cl2, cooled to −78° C., and 900 μL of a 1M DIBAL-H solution in CH2Cl2 was added dropwise. After stirring for 45 min, the reaction was quenched with 500 μL of acetone, the cooling bath was removed, 15 mL of a 0.5 M tartaric acid solution was added, and the biphasic mixture was stirred for 1 h. The layers were separated, the organic was washed with water, dried over Na2SO4, and concentrated: The residue was then dissolved in 5 mL of THF and 1 mL of MeOH, and a small amount of NaBH4 was added. After stirring for 15 min, the reaction was quenched with 1M HCl, extracted twice with EtOAc, washed with brine, dried over Na2SO4, concentrated, and the residue purified by silica gel chromatography with EtOAc/hexanes to provide 2-2 as a sticky white taffy. Data for 2-2: 1HNMR (500 MHz, CDCl3) δ 7.4-7.2 (m, 5H), 7.1-6.9 (m, 3H), 6.4 (s, 1H), 4.8-4.6 (m, 3H), 4.2 (d, 1H), 3.8-3.7 (m, 2H), 3.7-3.5 (m, 2H), 2.85 (s, 6H) ppm. HRMS (ES) calc'd M+H for C22H24F2N2O3: 403.1828. Found: 403.1824.

Provenance & Evidence