[Cl:1][C:2]1[C:3]2[C:10]([I:11])=[CH:9][NH:8][C:4]=2[N:5]=[CH:6][N:7]=1.[CH:12]1([CH2:15]O)[CH2:14][CH2:13]1.C1C=CC(P(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1.CC(OC(/N=N/C(OC(C)C)=O)=O)C>C1COCC1>[Cl:1][C:2]1[C:3]2[C:10]([I:11])=[CH:9][N:8]([CH2:15][CH:12]3[CH2:14][CH2:13]3)[C:4]=2[N:5]=[CH:6][N:7]=1To a mixture of 4-chloro-5-iodo-7H-pyrrolo[2,3-d]pyrimidine (prepared according to: L. B. Townsend et al., J. Med. Chem. 1990, 33 (7), 1984-92) (419 mg, 1.50 mmol), cyclopropylmethanol (165 μL, 147 mg, 2.04 mmol), and PS—PPh3 (2.12 mmol/g; 1.41 g, 2.99 mmol) in dry THF (10 mL), cooled by ice/water, was added DIAD (440 μL, 452 mg, 2.23 mmol; 1.5 equiv.), then the cooling bath was removed and the mixture was vortexed overnight. The resin was filtered off and washed thoroughly with THF, and the filtrate and washings were combined and concentrated. Chromatography of the crude material thus obtained on silica gel (Jones Flashmaster, 2 columns, 10 g/70 mL cartridge each, eluting with CH2Cl2) gave the title compound as an off-white solid. 1H NMR (CDCl3, 400 MHz): δ=0.41-0.47 (m, 2H), 0.63-0.69 (m, 2H), 1.20-1.31 (m, 1H), 4.12 (d, J=7.2 Hz, 2H), 7.52 (s, 1H), 8.61 (s, 1H). MS (ES+): m/z 333.9/335.9 (100/38) [MH+]. HPLC: tR=3.7 min (OpenLynx, polar—5 min).
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