Diisopropylethylamine → HCID 178490212, compound

Participants

Reaction Steps

A suspension of (3-methoxy-4-nitrobenzyl)prop-2-en-1-ylphosphinic acid (Compound 37E, 241 mg, 0.888 mmol) and 3-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazol-1-yl]propan-1-ol (Compound 3E, 224 mg, 0.888 mmol) in 1,2-Dichloroethane (19 mL) and DIPEA (0.928 mL, 5.33 mmol) was charged with (benzotriazol-1-yloxy)tripyrrolidino-phosphonium hexafluorophosphate (1387 mg, 2.665 mmol). The reaction mixture was stirred at rt for 16 hours. The reaction mixture was quenched with water (10 mL) and extracted with DCM (20 mL). The organic layer was washed with NaHCO3 (10 mL), washed with brine (15 mL), dried over anhydrous Na2SO4, filtered, and concentrated under reduced pressure to a yellow oil. The crude material was purified on a Teledyne ISCO Combiflash® Rf system using DCM/MeOH (100:0→95:5) as eluent. The fractions containing product were combined and concentrated under reduced pressure to yield a light yellow oil. The material was re-purified on a Teledyne ISCO Combiflash® Rf system using 1:1 DCM-EtOAc/MeOH (100:0→95:5) as eluent. The fractions containing product were combined and concentrated under reduced pressure to yield a light yellow solid (189.6 mg, 42%). 1H NMR (CDCl3, 400 MHz): δ=7.81-7.87 (m, 2H), 7.71 (s, 1H), 7.11 (s, 1H), 6.92 (d, J=7.8 Hz, 1H), 5.73-5.86 (m, 1H), 5.19-5.32 (m, 2H), 4.27 (t, J=6.4 Hz, 2H), 3.90-4.04 (m, 5H), 3.20 (d, J=16.2 Hz, 2H), 2.61 (dd, J=7.6, 17.4 Hz, 2H), 2.15-2.25 (m, 2H), 1.33 (s, 12H). MS (ESI): m/z 506.63 [M+H]+. UPLC: tR=1.23 min (UPLC-SQD: analytical—2 min).

Provenance & Evidence