Water → 3-Fluoro-1,3-dihydro-1-methyl-7-chloro-5-phenyl-2H-1,4-benzodiazepin-2-one

HRID 1389808

Reaction equation

HRID 1389808 reaction equation
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[N:4]([CH3:20])[C:3]1=[O:21].C(N(S(F)(F)[F:28])CC)C.O>C(Cl)Cl>[F:28][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[N:4]([CH3:20])[C:3]1=[O:21]

Participants

5

Reactant 3

HCID 962WaterHCID 5391TemazepamHCID 123472(Diethylamino)sulfur trifluoride

Product 1

HCID 126021203-Fluoro-1,3-dihydro-1-methyl-7-chloro-5-phenyl-2H-1,4-benzodiazepin-2-oneYield 70%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent2×

Procedure

A solution of 12.1 g (0.04 mol) of 3-hydroxy-1,3-dihydro-1-methyl-7-chloro-5-phenyl-2H-1,4-benzodiazepin-2-one in 25 ml of anhydrous methylene chloride was added dropwise over a period of 15 min. to a stirred solution of 12.6 ml (0.1 mol) of diethylaminosulfur trifluoride in 300 ml of anhydrous methylene chloride cooled to -70° . The reaction mixture was allowed to warm slowly over a period of 45 min. to 5° and then poured into 500 ml of ice and water. The lower organic layer was separated, washed with water, dried over anhydrous magnesium sulfate, and evaporated to drynes under reduced pressure to give 10.9 g (90% yield) of crude product as a light yellow solid residue. Recrystallization from heptane gave 8.48 g (70% yield) of 3-fluoro-1,3-dihydro-1-methyl-7-chloro-5-phenyl-2H-1,4-benzodiazepin-2-one as colorless crystals: mp 138°-140°; 19F nmr (CCl3D) δ -161.7 ppm (d, J=57 Hz); 1H nmr (CCl3D) δ 3.43 ppm (s, 3H), 5.54 ppm (d, J=57 Hz, 1H), 7.5 ppm (m, 8H).

Workup

  1. temperaturecooled to -70°
  2. temperatureto warm slowly over a period of 45 min. to 5°
  3. customThe lower organic layer was separated
  4. washwashed with water
  5. dry with materialdried over anhydrous magnesium sulfate
  6. customevaporated to drynes under reduced pressure
  7. customto give 10.9 g (90% yield) of crude product as a light yellow solid residue
  8. customRecrystallization from heptane

Sources & evidence

ORD record
ord-4a982f79934d4c26971afc58555f3c2f
Source dataset
uspto-grants-1981_01
Patent number
US04246270

Linked notes

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