Diisopropylethylamine → HCID 131735533, compound

Participants

Reaction Steps

A round-bottom flask was charged with HATU (1711 mg, 4.50 mmol) and dry DMF (2.25E+04 μl) at 0° C. N,N-diisopropylethylamine (1531 μl, 9.00 mmol) was added followed by addition of a solution of the product of step 3 (1827 mg, 2.25 mmol) in dry DMF (2.25E+04 μl) via syringe pump over 1 hour. After addition was complete the reaction was stirred at room temperature for 2 hours. LCMS and MS analyses showed a complete reaction. The reaction mixture was concentrated to almost dryness in rotavap (high vacuum) and the residue was diluted with ethyl acetate (200 mL). The mixture was washed with water (50 mL), aq. 1M HCl (50 mL), half-saturated sodium bicarbonate (50 mL) and brine (50 mL). The organic layer was dried over magnesium sulfate, filtered and concentrated in rotavap. The residue was purified on a Redisep (120 g) silica gel column (gradient: 0 to 40% ethyl acetate in hexanes) to give the title compound (900 mg, 1.324 mmol, 58.8% yield) as a white powder.

Provenance & Evidence