Tetrabutylammonium Fluoride → 6-(4-Hydroxy-6-methoxy-7-methyl-3-oxo-1,3-dihydro-isobenzofuran-5-yl)-2-[4-(hydroxy-methoxy-phosphoryl)-but-2-enyl]-4-methyl-hex-4-enoic Acid

HRID 33628Notes

Reaction equation

HRID 33628 reaction equation
C[Si](C)(C)CC[O:5][C:6](=[O:42])[CH:7]([CH2:33][CH:34]=[CH:35][CH2:36][P:37]([OH:41])([O:39][CH3:40])=[O:38])[CH2:8][C:9]([CH3:32])=[CH:10][CH2:11][C:12]1[C:13]([O:25]CC[Si](C)(C)C)=[C:14]2[C:18](=[C:19]([CH3:23])[C:20]=1[O:21][CH3:22])[CH2:17][O:16][C:15]2=[O:24].CCCC[N+](CCCC)(CCCC)CCCC.[F-]>C1COCC1>[OH:25][C:13]1[C:12]([CH2:11][CH:10]=[C:9]([CH3:32])[CH2:8][CH:7]([CH2:33][CH:34]=[CH:35][CH2:36][P:37]([OH:41])([O:39][CH3:40])=[O:38])[C:6]([OH:42])=[O:5])=[C:20]([O:21][CH3:22])[C:19]([CH3:23])=[C:18]2[C:14]=1[C:15](=[O:24])[O:16][CH2:17]2

Participants

4

Reactant 2

HCID 2724141Tetrabutylammonium FluorideHCID 765461902-[4-(Hydroxy-methoxy-phosphoryl)-but-2-enyl]-6-[6-methoxy-7-methyl-3-oxo-4-(2-trimethylsilanyl-ethoxy)-1,3-dihydro-isobenzofuran-5-yl]-4-methyl-hex-4-enoic acid 2-trimethylsilanyl-ethyl ester

Product 1

HCID 725636706-(4-Hydroxy-6-methoxy-7-methyl-3-oxo-1,3-dihydro-isobenzofuran-5-yl)-2-[4-(hydroxy-methoxy-phosphoryl)-but-2-enyl]-4-methyl-hex-4-enoic AcidYield 100.1%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

To a solution of 2-[4-(hydroxy-methoxy-phosphoryl)-but-2-enyl]-6-[6-methoxy-7-methyl-3-oxo-4-(2-trimethylsilanyl-ethoxy)-1,3-dihydro-isobenzofuran-5-yl]-4-methyl-hex-4-enoic acid 2-trimethylsilanylethyl ester (11 mg, 0.016 mmol) in THF (1 mL) was added TBAF (50 μL, 1M solution in THF) at room temperature. The solution was stirred for 16 hours and concentrated. The solution was dried under reduced pressure and re-suspended in DMF (0.8 mL) and water (0.25 mL). The solution was filtered through Acrodisc (13 mm syringe filter with a 0.45 μm Nylon membrane) and purified by RP HPLC using a Phenomenex Synergi 5μ Hydro RP 80A column (50×21.2 mm) with eluents of H2O, 0.1% TFA-CH3CN, 0.1% TFA. The product from the column was subjected to ion exchange chromatography (Sodium salt form of Dowex 50WX8-400) using a 2×4.5 cm column eluting with H2O-MeOH (1:1) to provide 7.5 mg of the desired product as an oil. 1H NMR (300 MHz, CDCl3) δ 1.80 (s, 3H), 2.01-2.29 (m, 5H), 2.11 (s, 3H), 2.35 (d, 2H, J=22 Hz), 3.38 (d, 2H, J=7 Hz), 3.53 (d, 3H, J=11 Hz), 3.75 (s, 3H), 5.19 (s, 2H), 5.26 (t, 1H, J=6 Hz), 5.43-5.54 (m, 2H) ppm; 31P (121.4 MHz, CDCl3) δ 23.5 ppm; MS (m/z) 469.2 [M+H]+, 491.3 [M+Na]+.

Workup

  1. concentrationconcentrated
  2. customThe solution was dried under reduced pressure
  3. filtrationThe solution was filtered through Acrodisc (13 mm syringe
  4. filtrationfilter with a 0.45 μm Nylon membrane) and
  5. custompurified by RP HPLC
  6. washeluting with H2O-MeOH (1:1)

Sources & evidence

ORD record
ord-dab35012657c49b6b9e29ff535b3389c
Source dataset
uspto-grants-2008_09
Patent number
US07429565B2

Reaction notes

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