Benzyl Bromide → Benzhydryl 4-(2-furyl)-3-oxaoctanoate

HRID 5563

Reaktionsgleichung

Reaktionsgleichung von HRID 5563
[O:1]1[CH:5]=[CH:4][CH:3]=[C:2]1[CH:6]([CH2:25][CH2:26][CH2:27][CH3:28])[O:7][CH2:8][C:9]([O:11][CH:12]([C:19]1[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=1)[C:13]1[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1)=[O:10].C1COCC1.C[Si]([N-][Si](C)(C)C)(C)C.[Na+].[CH2:44](Br)[C:45]1[CH:50]=[CH:49][CH:48]=[CH:47][CH:46]=1>CN(P(N(C)C)(N(C)C)=O)C>[CH2:44]([C@@H:8]([O:7][C@H:6]([C:2]1[O:1][CH:5]=[CH:4][CH:3]=1)[CH2:25][CH2:26][CH2:27][CH3:28])[C:9]([O:11][CH:12]([C:19]1[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=1)[C:13]1[CH:14]=[CH:15][CH:16]=[CH:17][CH:18]=1)=[O:10])[C:45]1[CH:50]=[CH:49][CH:48]=[CH:47][CH:46]=1.[O:1]1[CH:5]=[CH:4][CH:3]=[C:2]1[CH:6]([CH2:25][CH2:26][CH2:27][CH3:28])[O:7][CH2:8][C:9]([O:11][CH:12]([C:19]1[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=1)[C:13]1[CH:14]=[CH:15][CH:16]=[CH:17][CH:18]=1)=[O:10]

Komponenten

7

Versuchsvorschrift

Using the procedure in example 90 and (4S) benzhydryl 4-(2-furyl)-3-oxaoctanoate (5.0 g, 13.2 mmol), THF (50 mL), sodium bis(trimethylsilyl)amide (1.0M in THF, 14 mL, 14 mmol), and benzyl bromide (1.7 mL, 14 mmol) in 10 mL HMPA gave (2R,4S) benzhydryl 2-Benzyl-4-(2-furyl)-3-oxaoctanoate, 646.6 mg (10%) and 723 mg (12%) of the (2S 4S) diastereomer which was identical to the sample prepared in example 90. (2R,4S) diastereomer: [α]25D -34.8° (c 1.12, CHCl3); 1H NMR (300 MHz, CDCl3) δ 0.78 (t, 3H, J=7 Hz), 1.12 (m, 4H), 1.69 (m, 1H), 1.83 (m, 1H), 2.98 (m, 2H), 4.11 (t, 1H, J=7 Hz), 4.21 (dd, 1H, J=8 Hz), 6.07 (m, 2H), 6.72 (s, 1H), 7.26 (m, 16H); mass spectrum (FAB): 486 (M+NH4).

Quellen und Nachweise

ORD-Eintrag
ord-85107b868f4343088910de19a024cbd4
Quelldatensatz
uspto-grants-1993_09
Patentnummer
US05244910

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