Toluene → 4-[6-Methoxy-7-methyl-3-oxo-4-(2-trimethylsilanyl-ethoxy)-1,3-dihydro-isobenzofuran-5-yl]-2-methyl-but-2-enal

HRID 2282006Notes

Reaction equation

HRID 2282006 reaction equation
[CH3:1][O:2][C:3]1[C:11]([CH3:12])=[C:10]2[C:6]([C:7](=[O:13])[O:8][CH2:9]2)=[C:5]([O:14][CH2:15][CH2:16][Si:17]([CH3:20])([CH3:19])[CH3:18])[C:4]=1[CH2:21]C=O.C1(P(C2C=CC=CC=2)(C2C=CC=CC=2)=[C:31]([CH3:34])[CH:32]=[O:33])C=CC=CC=1.[C:47]1(C)C=CC=CC=1>>[CH3:1][O:2][C:3]1[C:11]([CH3:12])=[C:10]2[C:6]([C:7](=[O:13])[O:8][CH2:9]2)=[C:5]([O:14][CH2:15][CH2:16][Si:17]([CH3:18])([CH3:20])[CH3:19])[C:4]=1[CH2:21][CH:47]=[C:31]([CH3:34])[CH:32]=[O:33]

Participants

4

Reactant 3

HCID 1140TolueneHCID 42809872-(Triphenylphosphoranylidene)propionaldehyde2×HCID 57478686[6-Methoxy-7-methyl-3-oxo-4-(2-trimethylsilanyl-ethoxy)-1,3-dihydro-isobenzofuran-5-yl]-acetaldehyde

Product 1

HCID 765461944-[6-Methoxy-7-methyl-3-oxo-4-(2-trimethylsilanyl-ethoxy)-1,3-dihydro-isobenzofuran-5-yl]-2-methyl-but-2-enalYield 83%

Procedure

[6-Methoxy-7-methyl-3-oxo-4-(2-trimethylsilanyl-ethoxy)-1,3-dihydro-isobenzofuran-5-yl]-acetaldehyde (70 mg, 0.21 mmol) in toluene (2 mL) was heated at 100° C. with 2-(triphenyl-phosphanylidene)-propionaldehyde (72.9 mg, 0.23 mmol) overnight. A second portion of 2-(triphenyl-phosphanylidene)-propionaldehyde (33 mg, 0.11 mmol) was added and the reaction mixture was heated for an additional day. After concentration, the residue was purified by silica gel chromatography to provide 54 mg (83%) of the desired product as a pale yellow oil. 1H NMR (300 MHz, CDCl3) δ 0.00 (s, 9H), 1.10-1.21 (m, 2H), 1.87 (s, 3H), 2.16 (s, 3H), 3.67-3.76 (m, 2H), 3.74 (s, 3H), 4.27-4.39 (m, 2H), 5.11 (s, 2H), 6.40-6.48 (m, 1H), 9.2 (s, 1H) ppm.

Workup

  1. temperaturethe reaction mixture was heated for an additional day
  2. concentrationAfter concentration
  3. customthe residue was purified by silica gel chromatography

Sources & evidence

ORD record
ord-e7509bad84874de0bc8361399025cc43
Source dataset
uspto-grants-2015_09
Patent number
US09139604B2

Reaction notes

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