Triethylamine → (S)-1-Phenylethyl(R)-2-(4-hydroxy-4-phenylpiperidin-1-yl)-2-phenylacetate

HRID 417901

Reaktionsgleichung

Reaktionsgleichung von HRID 417901
Br[CH:2]([C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1)[C:3]([O:5][C@H:6]([C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=1)[CH3:7])=[O:4].C(N(CC)CC)C.[C:27]1([C:33]2([OH:39])[CH2:38][CH2:37][NH:36][CH2:35][CH2:34]2)[CH:32]=[CH:31][CH:30]=[CH:29][CH:28]=1>C1COCC1.[I-].C([N+](CCCC)(CCCC)CCCC)CCC.C(OCC)(=O)C>[OH:39][C:33]1([C:27]2[CH:32]=[CH:31][CH:30]=[CH:29][CH:28]=2)[CH2:38][CH2:37][N:36]([C@H:2]([C:14]2[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=2)[C:3]([O:5][C@H:6]([C:8]2[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=2)[CH3:7])=[O:4])[CH2:35][CH2:34]1

Komponenten

7

Edukt 3

HCID 8471TriethylamineHCID 963874-Phenylpiperidin-4-olHCID 59166394(S)-1-Phenylethyl 2-bromo-2-phenylacetate

Produkt 1

HCID 59166502(S)-1-Phenylethyl(R)-2-(4-hydroxy-4-phenylpiperidin-1-yl)-2-phenylacetateAusbeute 27,3 %

Reagenzien, Katalysatoren, Lösungsmittel 3

HCID 67553Tetrabutylammonium IodideKatalysatorHCID 8028TetrahydrofuranLösungsmittel2×HCID 8857Ethyl AcetateLösungsmittel

Versuchsvorschrift

To a solution of (S)-1-phenylethyl 2-bromo-2-phenylacetate (1.50 g, 4.70 mmol) in THF (25 mL) was added triethylamine (1.31 mL, 9.42 mmol), followed by tetrabutylammonium iodide (0.347 g, 0.94 mmol). The reaction mixture was stirred at room temperature for 5 minutes and then a solution of 4-phenyl-4-hydroxypiperidine (1.00 g, 5.64 mmol) in THF (5 mL) was added. The mixture was stirred for 16 hours and then it was diluted with ethyl acetate (100 mL), washed (H2O×2, brine), dried (MgSO4), filtered and concentrated. The residue was purified on a silica gel column (0-60% ethyl acetate-hexane) to provide an approximately 2:1 mixture of diastereomers, as judged by 1H NMR, Separation of these isomers was performed using supercritical fluid chromatography (Chiralcel OJ-H, 30×250 mm; 20% ethanol in CO2 at 35° C.), to give first the (R)-isomer of the title compound (0.534 g, 27%) as a yellow oil and then the corresponding (S)-isomer (0.271 g, 14%), also as a yellow oil. (S,R)-isomer: 1H NMR (400 MHz, CD3OD) δ 7.55-7.47 (m, 4H), 7.44-7.25 (m, 10H), 7.25-7.17 (m, 1H), 5.88 (q, J=6.6 Hz, 1H), 4.12 (s, 1H), 2.82-2.72 (m, 1H), 2.64 (dt, J=11.1, 2.5 Hz, 1H), 2.58-2.52 (m, 1H), 2.40 (dt, J=1.1, 2.5 Hz, 1H), 2.20 (dt, J=12.1, 4.6 Hz, 1H), 2.10 (dt, J=12.1, 4.6 Hz, 1H), 1.72-1.57 (m, 2H), 1.53 (d, J=6.5 Hz, 3H). LCMS: Anal. Calcd. for C27H29NO3: 415; found: 416 (M+H)+; (S,S)-isomer: H1NMR (400 MHz, CD3OD) δ 7.55-7.48 (m, 2H), 7.45-7.39 (m, 2H), 7.38-7.30 (m, 5H), 7.25-7.13 (m, 4H), 7.08-7.00 (m, 2H), 5.88 (q, J=6.6 Hz, 1H), 4.12 (s, 1H), 2.95-2.85 (m, 1H), 2.68 (dt, J=11.1, 2.5 Hz, 1H), 2.57-2.52 (m, 1H), 2.42 (dt, J=11.1, 2.5 Hz, 1H), 2.25 (dt, J=2.1, 4.6 Hz, 1H), 2.12 (dt, J=12.1, 4.6 Hz, 1H), 1.73 (dd, J=13.6, 3.0 Hz, 1H), 1.64 (dd, J=13.6, 3.0 Hz, 1H), 1.40 (d, J=6.6 Hz, 3H). LCMS: Anal. Calcd. for C27H29NO3: 415; found: 416 (M+H)+.

Aufarbeitung

  1. stirringThe mixture was stirred for 16 hours
  2. washwashed (H2O×2, brine)
  3. dry with materialdried (MgSO4)
  4. filtrationfiltered
  5. concentrationconcentrated
  6. customThe residue was purified on a silica gel column (0-60% ethyl acetate-hexane)
  7. customto provide
  8. additionan approximately 2:1 mixture of diastereomers
  9. customas judged by 1H NMR, Separation of these isomers
  10. customfluid chromatography (Chiralcel OJ-H, 30×250 mm; 20% ethanol in CO2 at 35° C.)

Quellen und Nachweise

ORD-Eintrag
ord-ba6b2173681a416fbea563768ebd6c29
Quelldatensatz
uspto-grants-2012_01
Patentnummer
US08093243B2

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