Triethyl phosphite → 2-[4-(Diethoxy-phosphoryl)-but-2-enyl]-6-(4-hydroxy-6-methoxy-7-methyl-3-oxo-1,3-dihydro-isobenzofuran-5-yl)-4-methyl-hex-4-enoic acid methyl ester

HRID 32953

Reaction equation

HRID 32953 reaction equation
[CH3:1][O:2][C:3](=[O:29])[CH:4]([CH2:24][CH:25]=[CH:26][CH2:27]Br)[CH2:5][C:6]([CH3:23])=[CH:7][CH2:8][C:9]1[C:10]([OH:22])=[C:11]2[C:15](=[C:16]([CH3:20])[C:17]=1[O:18][CH3:19])[CH2:14][O:13][C:12]2=[O:21].[CH2:30]([O:32][P:33]([O:37]CC)[O:34][CH2:35][CH3:36])[CH3:31]>C1(C)C=CC=CC=1>[CH3:1][O:2][C:3](=[O:29])[CH:4]([CH2:24][CH:25]=[CH:26][CH2:27][P:33]([O:34][CH2:35][CH3:36])([O:32][CH2:30][CH3:31])=[O:37])[CH2:5][C:6]([CH3:23])=[CH:7][CH2:8][C:9]1[C:10]([OH:22])=[C:11]2[C:15](=[C:16]([CH3:20])[C:17]=1[O:18][CH3:19])[CH2:14][O:13][C:12]2=[O:21]

Participants

4

Reactant 2

HCID 31215Triethyl phosphiteHCID 670102042-(4-Bromo-but-2-enyl)-6-(4-hydroxy-6-methoxy-7-methyl-3-oxo-1,3-dihydro-isobenzofuran-5-yl)-4-methyl-hex-4-enoic acid methyl ester

Product 1

HCID 765461862-[4-(Diethoxy-phosphoryl)-but-2-enyl]-6-(4-hydroxy-6-methoxy-7-methyl-3-oxo-1,3-dihydro-isobenzofuran-5-yl)-4-methyl-hex-4-enoic acid methyl esterYield 44.5%

Reagents, catalysts & solvents 1

HCID 1140TolueneSolvent

Procedure

A solution of 2-(4-bromo-but-2-enyl)-6-(4-hydroxy-6-methoxy-7-methyl-3-oxo-1,3-dihydro-isobenzofuran-5-yl)-4-methyl-hex-4-enoic acid methyl ester 4B (140 mg, 0.30 mmol) and triethylphosphite (600 mg, 3.6 mmol) in toluene (30 mL) was stirred at reflux for 20 hours. The mixture was concentrated and chromatographed on silica gel eluting with ethyl acetate (60% to 100%)/hexanes, affording 2-[4-(diethoxy-phosphoryl)-but-2-enyl]-6-(4-hydroxy-6-methoxy-7-methyl-3-oxo-1,3-dihydro-isobenzofuran-5-yl)-4-methyl-hex-4-enoic acid methyl ester 4C as an oil (70 mg, 43%); 1H NMR (300 MHz, CDCl3) δ 1.27 (m, 6H), 1.79 (s, 3H), 2.0-2.7 (m, 8H), 3.37 (d, J=6.6 Hz), 3.52 (s, 3H), 3.75 (s, 3H), 4.08 (m, 4H), 5.20 m, 3H), 5.45 (m, 2H) ppm.

Workup

  1. temperatureat reflux for 20 hours
  2. concentrationThe mixture was concentrated
  3. customchromatographed on silica gel eluting with ethyl acetate (60% to 100%)/hexanes

Sources & evidence

ORD record
ord-57c1641a27bc4223ac590594d6dc7a62
Source dataset
uspto-grants-2008_09
Patent number
US07427636B2

Linked notes

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