Sodium hydride → Methyl (2R)-2-(3,5-Di-t-butyl-4-hydroxyphenyl)thiopropanoate

HRID 248201

Reaktionsgleichung

Reaktionsgleichung von HRID 248201
[H-].[Na+].[C:3]([C:7]1[CH:12]=[C:11](S)[CH:10]=[C:9]([C:14]([CH3:17])([CH3:16])[CH3:15])[C:8]=1[OH:18])([CH3:6])([CH3:5])[CH3:4].[SH:19]C1C=CC=CC=1O.C1(S(O[C@@H:37]([CH3:42])[C:38]([O:40][CH3:41])=O)(=O)=O)C=CC=CC=1>C(#N)C>[C:3]([C:7]1[CH:12]=[C:11]([C@@H:37]([CH3:42])[C:38]([O:40][CH3:41])=[S:19])[CH:10]=[C:9]([C:14]([CH3:17])([CH3:16])[CH3:15])[C:8]=1[OH:18])([CH3:6])([CH3:5])[CH3:4]

Komponenten

6

Edukt 4

HCID 24758Sodium hydrideHCID 703702,6-Di-tert-butyl-4-mercaptophenolHCID 70718Phenol, o-mercapto-(6CI,7CI,8CI)HCID 57260475Methyl (2S)-2-(Phenylsulfonyl)oxypropanate2×

Produkt 1

HCID 53918114Methyl (2R)-2-(3,5-Di-t-butyl-4-hydroxyphenyl)thiopropanoateAusbeute 81 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 6342AcetonitrileLösungsmittel3×

Reaktionsbedingungen

Temperatur
25 °C

Versuchsvorschrift

To a solution of 60% sodium hydride in mineral oil (7.0 g, 0.20 mol) and acetonitrile (200 mL) under a nitrogen atmosphere was added dropwise a solution of 2,6-di-t-butyl-4-mercaptophenol (A) (53.7 g, 0.23 mol, 90%) in acetonitrile (100 mL) over a 1 h period. The reaction mixture was stirred at 25° C. for an additional hour to ensure complete anion generation. To the mercaptophenol anion was added a solution of methyl (2S)-2-(phenylsulfonyloxy)propanate (50 g, 0.20 mol, 12) in acetonitrile (100 mL) dropwise over a 1 h period. Upon addition of methyl (2S)-2-(phenylsulfonyloxy)propanate a white precipitate was observed. The reaction mixture was allowed to stir at 25° C. overnight. The mixture was worked-up by filtration through a coarse sintered glass funnel containing was Celite®. The solvent was removed by rotary evaporation to afford a smelly yellow oil. Purification by flash chromatography on silica gel (EM silica gel 60, 0.040-0.063 partical size, 230-400 Mesh, column size: 10 cm diameter×30 cm length) using hexane and ethyl acetate (9:1) afforded 51.3 g (81%) of methyl (2R)-2-(3,5-di-t-butyl-4-hydroxyphenyl)thiopropanoate (31) as a thick oil: 1H NMR (CDCl3) δ1.42-1.45 (m, 21 H), 3.60-3.68 (q, J=7.2 Hz, 1 H), 3.67 (s, 3 H), 5.33 (s, --OH, 1 H), 7.29 (s, 2 H); 13C NMR (CDCl3) δ173.3, 154.6, 136.6, 131.8, 122.0, 52.0, 46.0, 34.3, 30.2, 17.4; IR (neat) 3635 (s), 2958 (vs), 2875 (s), 1737 (vs), 1426 (vs), 1237 (vs), 1160 (vs), 855 (w), 774 (w) cm-1.

Aufarbeitung

  1. stirringto stir at 25° C. overnight
  2. filtrationThe mixture was worked-up by filtration through a coarse sintered glass funnel
  3. additioncontaining
  4. customThe solvent was removed by rotary evaporation
  5. customto afford a smelly yellow oil
  6. customPurification by flash chromatography on silica gel (EM silica gel 60, 0.040-0.063 partical size, 230-400 Mesh, column size: 10 cm diameter×30 cm length)

Quellen und Nachweise

ORD-Eintrag
ord-7210503a5ef7460a8a1b376243299de6
Quelldatensatz
uspto-grants-1993_05
Patentnummer
US05208345

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