Reaktion #57073

Reaktionsgleichung

diethyl ether

THF

4-nitrophenol

→

solid 3

Ausbeute 94.0%

(1S,2S)-2-(4-nitrophenoxy)-1,2,-dihydro-naphthalen-1-ol

Ausbeute 94.0%

Reaktionsbedingungen

Aufarbeitung

1. 1
   Extraktionextracted 3 times with 10% aqueous sodium hydroxide solution
2. 2
   Extraktionback-extracted three times with diethyl ether
3. 3
   WaschenThe combined ether extracts were washed with brine
4. 4
   Trocknendried with anhydrous sodium sulfate
5. 5
   SonstigeThe solvents were removed in vacuo
6. 6
   Sonstigeyielding a solid which
7. 7
   Sonstigewas purified by flash chromatography on silica gel (30% ethyl acetate in hexanes)

Vorschrift

To a flame dried round-bottomed flask, [Rh(COD)Cl]2 (1.7 mg, 0.0035 mmol), (S)—(R)-PPF-PtBu2 (3.8 mg, 0.0069 mmol) and 1 (100 mg, 0.694 mmol) were added followed by addition of THF (2.5 mL) and 4-nitrophenol (483 mg, 3.47 mmol). The mixture was heated at 80° C. for 45 minutes, then poured into diethyl ether and extracted 3 times with 10% aqueous sodium hydroxide solution. The aqueous extracts were combined and back-extracted three times with diethyl ether. The combined ether extracts were washed with brine and dried with anhydrous sodium sulfate. The solvents were removed in vacuo, yielding a solid which was purified by flash chromatography on silica gel (30% ethyl acetate in hexanes) giving a white crystalline solid 3 (184 mg, 94%). The ee was determined to be 97% by formation of Mosher's ester. Fr=0.43 on silica (30% ethyl acetate:hexanes); mp 123-125° C. (dec.); [α]25D=+169.90 (c=10.3, CHCl3); IR (KBr, cm−1) 3351 (br), 3113 (w), 3071 (w), 2884 (w), 2843 (w), 1591 (s), 1503 (s), 1342 (s), 1295 (m), 1110 (m), 896 (w); 1H NMR (400 MHz, CDCl3): δ 8.18 (2H, d, J=9.2 Hz), 7.62-7.60 (1H, m), 7.31-7.29 (2H, m), 7.15-7.13 (1H, m), 6.99 (2H, d, J=9.2 Hz), 6.57 (1H, d, J=9.9 Hz), 5.94 (1H, d, J=9.9 Hz), 5.20 (2H, s), 2.61 (1H, s); 13C NMR(400 MHz,CDCl3): δ 162.6, 141.8, 135.0, 131.5, 130.2, 128.5, 128.4, 126.8, 126.0, 125.5, 124.1, 115.4, 79.6, 72.0.

Quelle