Triphenyl(3,4,5-trimethoxybenzyl)phosphonium bromide → HCID 60130672, Verbindung

HRID 218251

Reaktionsgleichung

Reaktionsgleichung von HRID 218251
[Br-].[CH3:2][O:3][C:4]1[CH:5]=[C:6]([CH:27]=[C:28]([O:32][CH3:33])[C:29]=1[O:30][CH3:31])[CH2:7][P+](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1.C([Li])CCC.[Si:39]([O:46][C:47]1[C:54]([O:55][Si:56]([C:59]([CH3:62])([CH3:61])[CH3:60])([CH3:58])[CH3:57])=[CH:53][C:52]([Br:63])=[CH:51][C:48]=1[CH:49]=O)([C:42]([CH3:45])([CH3:44])[CH3:43])([CH3:41])[CH3:40]>O1CCCC1.CCCCCC.C(OC)(C)(C)C>[Br:63][C:52]1[CH:51]=[C:48](/[CH:49]=[CH:7]\[C:6]2[CH:27]=[C:28]([O:32][CH3:33])[C:29]([O:30][CH3:31])=[C:4]([O:3][CH3:2])[CH:5]=2)[C:47]([O:46][Si:39]([C:42]([CH3:45])([CH3:43])[CH3:44])([CH3:41])[CH3:40])=[C:54]([O:55][Si:56]([C:59]([CH3:62])([CH3:61])[CH3:60])([CH3:57])[CH3:58])[CH:53]=1

Komponenten

7

Edukt 3

HCID 370917Triphenyl(3,4,5-trimethoxybenzyl)phosphonium bromideHCID 60130680HCID 60130680, VerbindungHCID 178418339Butyllithium

Produkt 1

HCID 60130672HCID 60130672, VerbindungAusbeute 55,9 %

Reagenzien, Katalysatoren, Lösungsmittel 3

HCID 8028TetrahydrofuranLösungsmittel2×HCID 8058HexaneLösungsmittelHCID 15413tert-Butyl methyl etherLösungsmittel

Reaktionsbedingungen

Temperatur
0 °C

Versuchsvorschrift

A suspension of 3,4,5-trimethoxybenzyltriphenylphosphonium bromide (1.69 g, 3.23 mmol) in tetrahydrofuran (30 mL) was cooled to 0° C. and butyllithium (2 mL of a 1.6 N solution in hexane, 3.23 mmol) was added dropwise. The brick red solution was stirred at 0° C. for 20 min, then a solution of 19 (0.96 g, ca 2.2 mmol) in tetrahydrofuran (12 mL) was added dropwise. The temperature was allowed to rise to room temperature overnight, than the reaction was diluted with tert-butylmethyl ether (ca 100 mL) and washed with water (ca 50 mL, containing 1 mL 2N HCl) then brine (30 mL). The organic layer was dried over sodium sulphate and the solvent removed under reduced pressure to give a crude which was purified by column (elution with cyclohexane:AcOEt 10:1) to give 0.75 g of 20 still impure with 20% of the E isomer.

Aufarbeitung

  1. waitto rise to room temperature overnight, than the reaction
  2. washwashed with water (ca 50 mL, containing 1 mL 2N HCl)
  3. dry with materialThe organic layer was dried over sodium sulphate
  4. customthe solvent removed under reduced pressure
  5. customto give a crude which
  6. customwas purified by column (elution with cyclohexane:AcOEt 10:1)

Quellen und Nachweise

ORD-Eintrag
ord-ae5a82024ead43189050401038470273
Quelldatensatz
uspto-grants-2012_06
Patentnummer
US08198302B2

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