Triphenylphosphine → (E)-6-chloro-9-[4-(diisopropoxyphosphoryl)but-3-enyl]purine

HRID 1708092Notes

Reaction equation

HRID 1708092 reaction equation
[Cl:1][C:2]1[N:10]=[CH:9][N:8]=[C:7]2[C:3]=1[NH:4][CH:5]=[N:6]2.O[CH2:12][CH2:13]/[CH:14]=[CH:15]/[P:16](=[O:25])([O:21][CH:22]([CH3:24])[CH3:23])[O:17][CH:18]([CH3:20])[CH3:19].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.N(C(OCC)=O)=NC(OCC)=O>O1CCCC1>[Cl:1][C:2]1[N:10]=[CH:9][N:8]=[C:7]2[C:3]=1[N:4]=[CH:5][N:6]2[CH2:12][CH2:13]/[CH:14]=[CH:15]/[P:16]([O:21][CH:22]([CH3:23])[CH3:24])([O:17][CH:18]([CH3:19])[CH3:20])=[O:25]

Participants

6

Reactant 4

HCID 11776TriphenylphosphineHCID 220568ethyl N-ethoxycarbonyliminocarbamateHCID 53592776-ChloropurineHCID 10399205diisopropyl (E)-4-hydroxybut-1-enylphosphonate

Product 1

HCID 10067914(E)-6-chloro-9-[4-(diisopropoxyphosphoryl)but-3-enyl]purineYield 37.2%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Conditions

Temperature
0 °C

Procedure

To a mixture of 6-chloropurine (414 mg, 2.67 mmol), diisopropyl (E)-4-hydroxybut-1-enylphosphonate (630 mg, 2.67 mmol) and triphenyl phosphine (1.05 g, 4.00 mmol) in dry tetrahydrofuran (30 ml) stirred at 0° C. was added diethyl azodicarboxylate (0.70 g, 4.02 mmol). The mixture was allowed to warm to room temperature and stirred for 27.5 hr. The solvent was removed and the residue Was purified by column chromatography on silica gel eluting with dichloro-methane-methanol (24:1, 13:1) to give (E)-6-chloro-9-[4-(diisopropoxyphosphoryl)but-3-enyl]purine as a white solid (0.37 g, 37%), m.p. 105° C.; λmax (EtOH) 266 (9,260)nm; υmax (KBr) 3435, 2980, 1590, 1560, 1330, 1230 and 1210 cm-1 ; δH (CDCl3) 1.25 (12H, dd, J 6 Hz and 21 Hz, CH(CH3)2), 2.88 (2H, m, CH2), 4.45 (2H, t, J 7 Hz, CH2N), 4.55 (2H, m, CH(CH3)2), 5.68 (1H, dd, J 17 Hz and 20 Hz PCH=CH), 6.70 (1H, ddt, J 7 Hz, 17 Hz and 22 Hz, PCH=CH), 8.10 (1H, s, H-2/H-8), 8.77 (1H, s, H-2/H-8); FABMS (thioglycerol) 373 (MH+) (Found: C, 48.40; H, 6.03; N, 14.81%. C15H22ClN4O3P requires C, 48.33; H, 5.95; N, 15.03%).

Workup

  1. temperatureto warm to room temperature
  2. stirringstirred for 27.5 hr
  3. customThe solvent was removed
  4. customthe residue Was purified by column chromatography on silica gel eluting with dichloro-methane-methanol (24:1, 13:1)

Sources & evidence

ORD record
ord-2ce9467bafca43759eadb142f202b8f4
Source dataset
uspto-grants-1994_10
Patent number
US05356886

Reaction notes

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