Diethyl Ether → 10-[(tert-Butyldimethylsilyl)oxy]-3-(trimethylacetoxy)-7,8,9,10-tetrahydrophenanthridine

HRID 1198793Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 1198793
[Si:1]([O:8][CH:9]1[C:22]2[C:13](=[CH:14][N:15]=[C:16]3[C:21]=2[CH:20]=[CH:19][C:18]([OH:23])=[CH:17]3)[CH2:12][CH2:11][CH2:10]1)([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2].[H-].[Na+].[CH3:26][C:27]([CH3:37])([CH3:36])[C:28](N1CCSC1=S)=[O:29].C(OCC)C>C1COCC1.C1C=CC=CC=1>[Si:1]([O:8][CH:9]1[C:22]2[C:13](=[CH:14][N:15]=[C:16]3[C:21]=2[CH:20]=[CH:19][C:18]([O:23][C:28](=[O:29])[C:27]([CH3:37])([CH3:36])[CH3:26])=[CH:17]3)[CH2:12][CH2:11][CH2:10]1)([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2]

Komponenten

7

Edukt 4

HCID 3283Diethyl EtherHCID 24758Sodium hydrideHCID 117695952,2-Dimethyl-1-(2-thioxothiazolidin-3-yl)propan-1-oneHCID 13576196710-[(tert-Butyldimethylsilyl)oxy]-3-hydroxy-7,8,9,10-tetrahydrophenanthridine

Produkt 1

HCID 1181173110-[(tert-Butyldimethylsilyl)oxy]-3-(trimethylacetoxy)-7,8,9,10-tetrahydrophenanthridineAusbeute 99,1 %

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 241BenzeneLösungsmittelHCID 8028TetrahydrofuranLösungsmittel2×

Versuchsvorschrift

To a suspension of Compound 141a (1.28 g, 3.88 mmol) in dry THF (50 mL) cooled in an ice-water bath was added NaH (60 percent, 163 mg, 4.08 mmol) followed by stirring for 10 minutes. A yellow-colored solution of Compound 226 (0.789 g, 3.88 mmol) in dry THF (10 mL) was added, and the mixture was then stirred at 25° C. for five minutes. The reaction mixture was quenched with water, extracted with ethyl acetate (50 mL), washed with brine, dried over anhydrous Na2SO4, and evaporated in vacuo to give a residue. Flash column chromatography of the residue (silica gel, 20 percent ethyl ether in benzene) provided Compound 142a (1.59 g, 99 percent): white powder; mp 125°-126.5° C.; Rf =0.49 (silica, 20 percent ethyl ether in benzene); IR (CHCl3) νmax 2957, 2934, 1750, 1261, 1131, 1116, 1027 cm-1 ; 1 H NMR (300 MHz, CDCl3) δ 8.58 (s, 1 H, H6), 7.98 (d, J=9.1 Hz, 1 H, H1), 7.67 (d, J=2.1 Hz, 1 H, H4), 7.21 (dd, J=9.1, 2.1 Hz, 1 H, H2), 5.33 (t, J=2.9 Hz, 1 H, H10), 2.90 (br dd, J=17.2, 3.3 Hz, 1 H, H7), 2.72 (ddd, J=17.2, 11.2, 5.7 Hz, I H, H7), 2.17-1.96 (m, 2 H, H8 or H9), 1.83-1.67 (m, 2 H, H8 or H9), 1.31 (s, 9 H, COC(CH3)3), 0.74 (s, 9 H, SiC(CH3)3), 0.12 (s, 6 H, Si(CH3)2); MS (FAB+) m/e (rel intensity) 414 (M+H, 100), 357 (9), 330 (12), 283 (5), 198 (10); HRMS for C24H36NO3Si (M+H), calcd 414.2464, found 414.2484. Anal. Calcd for C24H35NO3Si: C, 69.69; H, 8.53; N, 3.39. Found: C, 69.68; H, 8.44; N, 3.23.

Aufarbeitung

  1. temperaturecooled in an ice-water bath
  2. stirringthe mixture was then stirred at 25° C. for five minutes
  3. customThe reaction mixture was quenched with water
  4. extractionextracted with ethyl acetate (50 mL)
  5. washwashed with brine
  6. dry with materialdried over anhydrous Na2SO4
  7. customevaporated in vacuo
  8. customto give a residue

Quellen und Nachweise

ORD-Eintrag
ord-6ead0c2438064dd5b9d1a3769de02d93
Quelldatensatz
uspto-grants-1994_01
Patentnummer
US05281710

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