(Z)-1-Ethoxy-2-(tributylstannyl)ethene → HCID 86606864, compound

HRID 1297151Notes

Reaction equation

[CH2:1]([N:8]1[CH:16]=[N:15][C:14]2[C:9]1=[N:10][CH:11]=[N:12][C:13]=2I)[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.Cl[Pd](Cl)([P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1)[P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1>[CH2:1]([N:8]1[CH:16]=[N:15][C:14]2[C:9]1=[N:10][CH:11]=[N:12][C:13]=2[CH:19]=[CH:18][O:20][CH2:21][CH3:22])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1

Participants

Conditions

Temperature: 100 °C

Procedure

A mixture of 9-benzyl-6-iodopurine (7) (1.00 g, 2.8 mmol), bis(triphenylphosphine)palladium(II) chloride (0.208 g, 0.02 mmol) and ethoxyvinyl(tributyl)tin (2.07 g, 3.8 mmol) in dry DMF (4 mL) was heated under N2 at 100° C. for 6 h. TLC indicated completion of reaction. 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 solvent (EtOAc) was distilled off and the residue obtained purified by flash chromatography. Yield 0.393 g, (47%). Mp 114-115° C. 1H NMR (CDCl3): δ 1.55 (t, 3H, CH3, J=7.5 Hz), 4.13 (q, 2H, CH2, J=13.7 Hz), 4.99 (d, 1H, CH, J=3 Hz), 5.48 (s, 2H, benzylic CH2), 6.16 (d, 1H, CH, J=3 Hz), 7.30-7.38 (m, 5H, Ar—H), 8.09 (s, 1H, purine C8—H), 9.07 (s, 1H, purine C2—H). 3C NMR (CDCl3): δ 14.3, 47.3, 63.7, 94.7, 127.8, 127.8, 128.6, 129.1, 129.2, 130.3, 135.0, 144.4, 152.1, 152.3, 152.4, 155.4.

Workup

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

Sources & evidence

ORD record: ord-2546a45c8c454daab6dc22547f1f7d21
Source dataset: uspto-grants-2007_07
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07250421B2

Reaction notes

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