Reaktion #87307

Reaktionsgleichung

ester

Ethyl (RS)-2-[4-Octanoylphenoxy]octanoate

lithium hydroxide

→

(RS)-2-[4-Octanoylphenoxy]octanoic Acid

Ausbeute 87.0%

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigeused for the preparation of I

Vorschrift

1-[4-Hydroxyphenyl]-1-octanone (440 mg, 2.0 mmol) and ethyl (RS)-2-bromooctanoate (552 mg, 2.2 mmol) were reacted according to the procedure used for the preparation of I to give Ethyl (RS)-2-[4-Octanoylphenoxy]octanoate (605 mg, 78%). 1H NMR (400 MHz, CDCl3): δ 7.91 (d, J=9.0 Hz, 2H), 6.88 (d, J=9.0 Hz, 2H), 4.66 (dd, J=5.1, 7.4 Hz, 1H), 4.20 (q, J=7.0 Hz, 2H), 2.88 (t, J=7.5 Hz, 2H), 1.88-2.02 (m, 2H), 1.70 (tt, J=7.2, 7.2 Hz, 2H), 1.41-1.56 (m, 2H), 1.25-1.37 (m, 14H), 1.23 (t, J=7.1 Hz, 3H), 0.87 (t, J=7.2 Hz, 3H), 0.86 (t, J=7.2 Hz, 3H); 13C NMR (101 MHz, CDCl3): δ 199.41, 171.48, 161.81, 131.01, 130.54 (2C), 114.77 (2C), 76.75, 61.62, 38.56, 32.90, 31.94, 31.78, 29.60, 29.38, 29.07, 25.33, 24.80, 22.85, 22.75, 14.39, 14.31, 14.26. The resulting ester (605 mg, 1.6 mmol) was saponified with lithium hydroxide (186 mg, 7.8 mmol) according to the procedure used for the preparation of I to give (RS)-2-[4-Octanoylphenoxy]octanoic Acid (487 mg, 87%). 1H NMR (400 MHz, CDCl3): δ 9.70 (br s, 1H), 7.89 (d, J=9.0 Hz, 2H), 6.89 (d, J=9.0 Hz, 2H), 4.69 (dd, J=5.9, 6.6 Hz, 1H), 2.87 (t, J=7.5 Hz, 2H), 1.95-2.01 (m, 2H), 1.67 (tt, J=7.2, 7.2 Hz, 2H), 1.43-1.58 (m, 2H), 1.24-1.37 (m, 14H), 0.851 (t, J=6.8 Hz, 3H), 0.849 (t, J=7.4 Hz, 3H); 13C NMR (101 MHz, CDCl3): δ 200.38, 176.08, 161.84, 130.85, 130.78 (2C), 114.83 (2C), 76.20, 38.56, 32.79, 31.93, 31.76, 29.57, 29.35, 29.05, 25.34, 24.92, 22.84, 22.74, 14.29, 14.23. The acid (500 mg, 1.4 mmol) was then converted to the sodium salt according to the procedure used for the preparation of I to give Sodium (RS)-2-[4-Octanoylphenoxy]octanoate (404 mg, 76%) as a white solid. mp 165-170° C.; 1H NMR (400 MHz, CD3OD): δ 7.91 (d, J=8.8 Hz, 2H), 6.95 (d, J=8.8 Hz, 2H), 4.58 (dd, J=6.1, 6.3 Hz, 1H), 2.91 (t, J=7.3 Hz, 2H), 1.91-1.96 (m, 2H), 1.62-1.69 (m, 2H), 1.44-1.58 (m, 2H), 1.25-1.39 (m, 14H), 0.87-0.90 (m, 6H); 13C NMR (101 MHz, CD3OD): S 200.50, 176.40, 162.96, 130.28 (2C), 129.94, 114.71 (2C), 78.38, 38.00, 32.98, 31.79, 31.74, 29.27, 29.20, 29.05, 25.50, 24.79, 22.56, 22.51, 13.36, 13.34; LRMS (ESI): m/z 769 (M2H+), 748 (2M-Na++2H+), 363 (M-Na++2W); HPLC: 3 min.

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