Tetrahydrofuran → HCID 13092017, compound

HRID 434825Notes

Reaction equation

HRID 434825 reaction equation
Cl.[Cl:2][C:3]1[CH:8]=[CH:7][CH:6]=[C:5]([F:9])[C:4]=1[CH:10]([OH:16])[C:11](=[NH:15])[O:12]CC.C(N(CC)CC)C.[O:24]1CCC[CH2:25]1>>[Cl:2][C:3]1[CH:8]=[CH:7][CH:6]=[C:5]([F:9])[C:4]=1[CH:10]1[O:16][C:25](=[O:24])[NH:12][C:11]1=[O:15]

Participants

4

Reactant 3

HCID 8028TetrahydrofuranHCID 8471TriethylamineHCID 13091979HCID 13091979, compound

Product 1

HCID 13092017HCID 13092017, compound

Procedure

Ethyl 1-(2-chloro-6-fluorophenyl)-1-hydroxymethanecarboximidate hydrochloride (15.0 g., 0.056 mole) and triethylamine (16.8 g., 23.3 ml., 0.167 mole) were taken into 560 ml. of tetrahydrofuran and cooled to 0° C. Phosgene was bubbled through the reaction mixture for 35 minutes. It was then stirred for 2.5 hours at room temperature, poured into 600 cc. of crushed ice and extracted with three portions of ethyl acetate. The combined extracts were washed with water, washed with brine, dried over anhydrous magnesium sulfate, filtered and evaporated in vacuo to product (14.4 g.). Recrystallization from toluene afforded purified 5-(2-chloro-6-fluorophenyl)oxazolidine-2,4-dione [10.7 g., 83%; m.p. 153°-155° C.; ir (KBr) 1820, 1740 cm-1 ].

Workup

  1. customPhosgene was bubbled through the reaction mixture for 35 minutes
  2. additionpoured into 600 cc
  3. extractionof crushed ice and extracted with three portions of ethyl acetate
  4. washThe combined extracts were washed with water
  5. washwashed with brine
  6. dry with materialdried over anhydrous magnesium sulfate
  7. filtrationfiltered
  8. customevaporated in vacuo to product (14.4 g.)
  9. customRecrystallization from toluene
  10. customafforded
  11. custompurified 5-(2-chloro-6-fluorophenyl)oxazolidine-2,4-dione [10.7 g., 83%; m.p. 153°-155° C.; ir (KBr) 1820, 1740 cm-1 ]

Sources & evidence

ORD record
ord-f2c6b3f63f8e4e86b1516514938be003
Source dataset
uspto-grants-1983_08
Patent number
US04399296

Reaction notes

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