Oxazepam → 7-Chloro-3-fluoro-5-phenyl-1,3-dihydro-2H-1,4-benzodiazepin-2-one

HRID 1112091

Reaktionsgleichung

Reaktionsgleichung von HRID 1112091
O[CH:2]1[N:8]=[C:7]([C:9]2[CH:14]=[CH:13][CH:12]=[CH:11][CH:10]=2)[C:6]2[CH:15]=[C:16]([Cl:19])[CH:17]=[CH:18][C:5]=2[NH:4][C:3]1=[O:20].C(N(S(F)(F)[F:27])CC)C.C(=O)=O.CC(C)=O>C(Cl)Cl>[F:27][CH:2]1[N:8]=[C:7]([C:9]2[CH:14]=[CH:13][CH:12]=[CH:11][CH:10]=2)[C:6]2[CH:15]=[C:16]([Cl:19])[CH:17]=[CH:18][C:5]=2[NH:4][C:3]1=[O:20]

Komponenten

5

Edukt 3

HCID 4616OxazepamHCID 123472(Diethylamino)sulfur trifluorideHCID 18522661Acetone cardice

Produkt 1

HCID 131259877-Chloro-3-fluoro-5-phenyl-1,3-dihydro-2H-1,4-benzodiazepin-2-one

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 6344DichloromethaneLösungsmittel

Versuchsvorschrift

A well stirred suspension of 10 g (0.03 mol) of 3-hydroxy-1,3-dihydro-7-chloro-5-phenyl-2H-1,4-benzodiazepin-2-one and 500 ml of methylene chloride was cooled to -70°. Diethylaminosulfur trifluoride (25 ml, 0.2 mol) was then added dropwise with exclusion of moisture and air. On completion of the addition the dry-ice acetone bath was removed, the contents of the flask were allowed to warm up in about 25 minutes to -10° and the reaction then immediately quenched by pouring into a beaker containing 400-500 ml of ice water. (If the reaction mixture is allowed to warm to 25°, none of the desired product is obtained.) Vigorous stirring of the ice water mixture continued for 7 to 10 minutes. The organic layer was separated, dried over MgSO4 and evaporated under reduced pressure to give a light orange powder. The product was dissolved in hot benzene, treated with decolorizing charcoal and filtered hot. On addition of heptane to the benzene solution, followed by cooling in ice, 3-fluoro-1,3-dihydro-7-chloro-5-phenyl-2H-1,4-benzodiazepin-2-one crystallized out as a white powder, 8.19 g (82%): mp 190°-192° (decom.); 19F nmr (DMSO-d6) δ -161.5 ppm (d, d, J = 56, 4 Hz, 1H), 1H nmr (DMSO-d6) δ 7.2-7.8 (m, 8H), δ 5.72 (d, J = 56 Hz, 1H), δ 11.0 ppm (N-H).

Aufarbeitung

  1. temperaturewas cooled to -70°
  2. customwas removed
  3. temperatureto warm up in about 25 minutes to -10°
  4. customthe reaction
  5. customthen immediately quenched
  6. additionby pouring into a beaker
  7. additioncontaining 400-500 ml of ice water
  8. temperatureto warm to 25°

Quellen und Nachweise

ORD-Eintrag
ord-44f65e9b1e4b4377b421603888b1ac5b
Quelldatensatz
uspto-grants-1978_10
Patentnummer
US04120856

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