Diisopropylamine → HCID 23570948, compound

Participants

Reaction Conditions

Reaction Steps

2.5M nButyllithium in hexanes (37.5 ml, 0.094 mol) was added, in a dropwise fashion, to a solution of diisopropylamine (14.45 ml, 0.103 mol) in tetrahydrofuran (300 ml) at 0° C. The solution was stirred at 0° C. for 20 minutes. The mixture was then cooled to −70° C. and a solution of (3,4-dichloro-phenyl)-acetic acid methyl ester (20.54 g, 0.094 mol) in tetrahydrofuran (50 ml) was added dropwise via cannula. The reaction mixture was stirred at −70° C. for 30 minutes. After this time, tert-butyl bromoacetate (45.42 ml, 0.281 mol) was added in a dropwise fashion. The cooling bath was removed and the reaction mixture was allowed to warm up to room temperature. The reaction mixture was quenched with a saturated solution of NH4Cl (100 ml). THF was partially removed in vacuo and the mixture was extracted with EtOAc (3×200 ml). The combined organic extrats were washed with brine, dried (MgSO4) and concentrated in vacuo. The crude mixture was purified by silica gel column chromatography using as eluent petrol: ether (9:1) to give the title compound in 92% yield.). 1H NMR (400 MHz, DMSO-d6) δ 1.34 (9H, s), 2.65 (1H, dd), 2.98 (1H, dd), 3.60 (3H, s), 4.08 (1H, m), 7.31 (1H, m), 7.58–7.62 (2H, m); MS (ES+): m/e=333.2 (5%); MS (ES−): m/e=331.2 (100%), 333.2 (65%), 335.2 (10%).

Provenance & Evidence