2,6-Lutidine → 6-(4-Hydroxy-6-methoxy-7-methyl-3-oxo-1,3-dihydro-isobenzofuran-5-yl)-4-methyl-2-phosphono-hex-4-enoic Acid Methyl Ester

HRID 540736Notes

Reaction equation

HRID 540736 reaction equation
[CH3:1][O:2][C:3](=[O:36])[CH:4]([P:30]([O:34]C)([O:32]C)=[O:31])[CH2:5][C:6]([CH3:29])=[CH:7][CH2:8][C:9]1[C:10]([O:22]CC[Si](C)(C)C)=[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].C[Si](Br)(C)C.N1C(C)=CC=CC=1C>C(#N)C>[CH3:1][O:2][C:3](=[O:36])[CH:4]([P:30]([OH:34])([OH:32])=[O:31])[CH2:5][C:6]([CH3:29])=[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

5

Reactant 3

HCID 79372,6-LutidineHCID 76113BromotrimethylsilaneHCID 765410362-(Dimethoxy-phosphoryl)-6-[6-methoxy-7-methyl-3-oxo-4-(2-trimethylsilanyl-ethoxy)-1,3-dihydro-isobenzofuran-5-yl]-4-methyl-hex-4-enoic acid methyl ester

Product 1

HCID 670102886-(4-Hydroxy-6-methoxy-7-methyl-3-oxo-1,3-dihydro-isobenzofuran-5-yl)-4-methyl-2-phosphono-hex-4-enoic Acid Methyl EsterYield 79%

Reagents, catalysts & solvents 1

HCID 6342AcetonitrileSolvent

Procedure

To a solution of 2-(dimethoxy-phosphoryl)-6-[6-methoxy-7-methyl-3-oxo-4-(2-trimethylsilanyl-ethoxy)-1,3-dihydro-isobenzofuran-5-yl]-4-methyl-hex-4-enoic acid methyl ester (30 mg, 0.055 mmol) in acetonitrile (2 mL) was added trimethylsilyl bromide (0.18 mL). After 10 minutes, 2,6-lutidine (0.16 mL) was added to the reaction at ambient temperature. The reaction was allowed to proceed for 16 hours before it was concentrated to dryness. The residue was resuspended in a solution of DMF:H2O (8:2, 1 mL) and purified by RP HPLC using a C18 column with a gradient of H2O, 0.1% TFA-acetonitrile, 0.1% TFA to provide 18 mg of the product as a white powder. 1H NMR (300 MHz, CD3OD) δ 1.81 (s, 3H), 2.16 (s, 3H), 2.40-2.49 (m, 1H), 2.63 (dt, 1H, J=6, 17 Hz), 3.07 (ddd, 1H, J=4, 12, 23 Hz), 3.38 (3, 2H, J=7 Hz), 3.52 (s, 3H), 3.77 (s, 3H), 5.25 (s, 2H), 5.28 (t, 1H, J=7 Hz) ppm; 31P (121.4 MHz, CDCl3) δ 19.5 ppm; MS (m/z) 415.2 [M+H]+, 437.2 [M+Na]+.

Workup

  1. waitto proceed for 16 hours before it
  2. concentrationwas concentrated to dryness
  3. custompurified by RP HPLC

Sources & evidence

ORD record
ord-7128bf174bd44f219997dc6e05807ecb
Source dataset
uspto-grants-2014_10
Patent number
US08871785B2

Reaction notes

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