Diisopropylethylamine → HCID 86746959, compound

Participants

Reaction Conditions

Reaction Steps

A 1M solution of dibutylboron triflate in dichloromethane (1.56 ml) was added to a solution of the product of step (iv) (422 mg, 1.42 mmol) in dry dichloromethane (9 ml) at 5° C. under argon, followed by diisopropylethylamine (0.295 ml, 1.7 mmol). The reaction mixture was stirred at 5° C. for 30 minutes and then cooled to -78° C. A solution of the product of step (iii) (280 mg, 1.56 mmol) in dichloromethane (2 ml) was added dropwise. The mixture was stirred at -78° C. for 30 minutes before being allowed to warm to room temperature. The reaction was quenched by the addition of pH7.2 phosphate buffer solution (1.36 ml) followed by hydrogen peroxide (0.4 ml, 30% w/v aqueous solution). The mixture was stirred for 30 minutes and then poured into water and extracted three times with dichloromethane. The combined extracts were dried (MgSO4), filtered, and evaporated. The residue was purified by column chromatography, eluting with ethyl acetate, to give methyl (7S,4Z)-7-[(S)-(1-hexylimidazol-5-yl)hydroxymethyl]-8-[(S)-4-isopropyl-2-oxo-1,3-oxazinan-3-yl]-8-oxo-oct-4-enoate (450 mg, 66% yield) as an oil; NMR 0.8-0.95(9H,m), 1.25-1.4(6H,m), 1.7-1.9(2H,m), 2.1-2.9(8H,m), 3.68(3H,s), 3.85-4.22(4H,m), 4.6-4.72(1H,m), 4.88(1H,m), 5.36-5.6(2H,m), 6.93(1H,s), 7.54(1H,s).

Provenance & Evidence