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1-Amino-2-propanol → Oxazolam

HRID 328480
Notes
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Reaction equation

HRID 328480 reaction equation
Br[CH2:2][C:3]([NH:5][C:6]1[CH:19]=[CH:18][C:17]([Cl:20])=[CH:16][C:7]=1[C:8]([C:10]1[CH:15]=[CH:14][CH:13]=[CH:12][CH:11]=1)=[O:9])=[O:4].C1(C)C(C)=CC=CC=1.[NH2:29][CH2:30][CH:31](O)[CH3:32].C(N(CC)CC)C>C(Cl)(Cl)Cl.C(OCC)(=O)C.CCCCCC>[Cl:20][C:17]1[CH:18]=[CH:19][C:6]2[NH:5][C:3](=[O:4])[CH2:2][N:29]3[CH2:30][CH:31]([CH3:32])[O:9][C:8]3([C:10]3[CH:15]=[CH:14][CH:13]=[CH:12][CH:11]=3)[C:7]=2[CH:16]=1
ParticipantsProcedureWorkupSources & evidenceReaction notes

Participants

8

Reactant 4

HCID 41-Amino-2-propanolHCID 7237O-XyleneHCID 8471TriethylamineHCID 122906N-(2-benzoyl-4-chlorophenyl)-2-bromoacetamide

Product 1

HCID 4617Oxazolam

Reagents, catalysts & solvents 3

HCID 6212ChloroformSolvent
HCID 8058
Hexane
Solvent
HCID 8857Ethyl AcetateSolvent

Procedure

A solution of 67 g. (0.19 mole) of 2-(2-bromoacetamido)-5-chloro-benzophenone, 500 ml. of xylene, 15.7 g. (0.21 mole) of 1-amino-2-propanol and 25 ml. of triethylamine was stirred at reflux for 20 hours. The reaction mixture was concentrated in vacuo to a residue which was partitioned between methylene chloride and water. The organic layer was washed with water, dried and concentrated to an oil which was crystallized from ethyl acetate to give 18.3 g. of a colorless solid, m.p. 181°-184°. Thin layer chromatography on Eastman alumina plates with an eluant of 3 parts of hexane and 2 parts of ethyl acetate revealed the prsence of two compounds. The product was dissolved in chloroform and chromatographed over Woelm neutral alumina I. A mixture concentrated in the above-titled product (the faster of the two compounds) was collected in 30% ethyl acetate-70% hexane. Recrystallizations from methylene chloride gave colorless prisms, m.p. 188°-189°.

Workup

  1. temperatureat reflux for 20 hours
  2. concentrationThe reaction mixture was concentrated in vacuo to a residue which
  3. customwas partitioned between methylene chloride and water
  4. washThe organic layer was washed with water
  5. customdried
  6. concentrationconcentrated to an oil which
  7. customwas crystallized from ethyl acetate
  8. customto give 18.3 g
  9. customchromatographed over Woelm neutral alumina I
  10. concentrationA mixture concentrated in the above-titled product (the faster of the two compounds)
  11. customwas collected in 30% ethyl acetate-70% hexane
  12. customRecrystallizations from methylene chloride
  13. customgave colorless prisms, m.p. 188°-189°

Sources & evidence

ORD record
ord-9c9fe9dbfb5f4c36a0788a8f20953a88
Source dataset
uspto-grants-1977_04
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US04017531

Reaction notes

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On this pageParticipantsProcedureWorkupSources & evidenceReaction notes