Morpholine → HCID 90002224, compound

Participants

Reaction Steps

To a solution of the carboxylic acid described above (460 mg, 80% pure, 0.90 mmol) in THF (6.0 mL) at RT was added HATU (613 mg, 1.61 mmol) and DIPEA (0.340 μL, 1.97 mmol). After 10 min the resulting mixture was treated with morpholine (0.141 mL, 1.61 mmol) and after a further 16 hr at RT additional portions of HATU (170 mg, 0.45 mmol), DIPEA (80 μL, 0.45 mmol) and morpholine (39 μL, 0.45 mmol) were added. The resulting mixture was maintained at RT for a further 24 hr and was then partitioned between saturated aq. NaHCO3 (20 mL) and EtOAc (20 mL). The organic phase was separated and was washed sequentially with 1M hydrochloric acid (20 mL), water (2×30 mL) and brine (2×30 mL) and was then dried and evaporated in vacuo. The residue was purified by flash column chromatography (SiO2, 40 g, 0-100% [10% MeOH in EtOAc] in isohexane, gradient elution) to afford the title compound, Intermediate B18, as a dark purple solid (165 mg, 82% pure, 24%); Rt 1.55 min (Method 2, acidic); m/z 482 (M+H)+ (ES+). The material was used in subsequent reactions without additional purification.

Provenance & Evidence