(Z)-1-Ethoxy-2-(tributylstannyl)ethene → 9-Benzyl-8-(alpha-ethoxyvinyl)purine

HRID 2099249Notes

Reaction equation

[CH2:1]([N:8]1[C:16](Br)=[N:15][C:14]2[C:9]1=[N:10][CH:11]=[N:12][CH:13]=2)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[CH2:18]([O:20][CH:21]=[CH:22][Sn](CCCC)(CCCC)CCCC)[CH3:19]>CN(C=O)C>[CH2:1]([N:8]1[C:16]([CH:19]=[CH:18][O:20][CH2:21][CH3:22])=[N:15][C:14]2[C:9]1=[N:10][CH:11]=[N:12][CH:13]=2)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1

Participants

Conditions

Temperature: 65 °C

Procedure

A mixture of 9-benzyl-8-bromopurine 13 (1.0 g, 3.4 mmol) bis(triphenylphosphine)-palladium(II)chloride (0.242 g, 0.30 mmol) and ethoxyvinyl(tributyl)tin (1.49 g, 4.14 mmol) in dry DMF (50 mL) was heated under N2 at 65° C. for 48 h. DMF was distilled off under reduced pressure and the resulting residue was redissolved in EtOAc (50 mL) and filtered through a pad of celite. The EtOAc was distilled off and the residue obtained was purified by flash chromatography. Yield 0.579 g, (59.7%). 1H NMR (CDCl3): δ 1.33 (t, 3H, CH3, J=7.5 Hz), 3.99 (q, 2H, CH2, J=13.7 Hz), 4.66 (d, 1H, CH, J=3 Hz), 5.34 (d, 1H, CH, J=3 Hz), 5.48 (s, 2H, benzylic CH2), 7.30-7.38 (m, 5H, Ar—H), 9.09 (s, 1H, purine C8—H), 9.2 (s, 1H, purine C2—H). 13C NMR (CDCl3): δ 14.2, 47.3, 64.2, 91.8, 126.8, 126.8, 127.7, 128.6, 128.6, 133.1, 136.4, 148.2, 151.2, 151.9, 152.8, 153.0.

Workup

distillationDMF was distilled off under reduced pressure
dissolutionthe resulting residue was redissolved in EtOAc (50 mL)
filtrationfiltered through a pad of celite
distillationThe EtOAc was distilled off
customthe residue obtained
customwas purified by flash chromatography

Sources & evidence

ORD record: ord-f07408274e7040df828dc89e106f3725
Source dataset: uspto-grants-2009_08
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07569573B2

Reaction notes

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