Phthalimide → 2-[(3-Chloropyrazin-2-yl)-quinolin-7-ylmethyl]-isoindole-1,3-dione

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To a suspension of (3-chloropyrazin-2-yl)-quinolin-7-ylmethanol (600 mg, 2.21 mmol), phthalimide (356 mg, 2.42 mmol), and PS—PPh3 (loading 2.12 mmol/g; 1.56 g, 3.31 mmol) in dry THF (20 mL), cooled by ice/water, was added DIAD (480 μL, 493 mg, 2.44 mmol), then the cooling bath was removed and the flask was vortexed at ambient temperature for 21.5 h. More PS—PPh3 (520 mg, 1.10 mmol) and DIAD (160 μL, 164 mg, 0.81 mmol) were added, and vortexing was continued for 6.5 h. The resin was filtered and washed with THF and CH2Cl2. The crude material was chromatographed on silica gel [Jones Flashmaster, 20 g/70 mL cartridge, eluting with hexanes:EtOAc 3:1 (1-14)→2:1 (15-29)→1:1 (30-65)→1:2 (66-80)], yielding the title compound as pale yellow solid; 1H NMR (CDCl3, 400 MHz) δ 7.12 (s, 1H), 7.41 (dd, J=4.4, 8.0 Hz, 1H), 7.54 (dd, J=2.0, 8.4 Hz, 1H), 7.72-7.78 (m, 2H), 7.81-7.89 (m, 3H), 8.01 (d, J=0.8 Hz, 1H), 8.16 (dd, J=0.8, 8.4 Hz, 1H), 8.39 (d, J=2.4 Hz, 1H), 8.50 (d, J=2.4 Hz, 1H), 8.90 (dd, J=1.6, 4.2 Hz, 1H); MS (ES+): m/z 401.0/402.9 (100/38) [MH+].

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