Acetic Anhydride → (+/-)-8-Methyl-7-(5-methyl-1,2,4-oxadiazol-3-yl)-5-(4-nitrophenyl)-8,9-dihydro-7H-1,3-dioxolo[4,5-h][2,3]benzodiazepine

HRID 25084Notes

Reaction equation

HRID 25084 reaction equation
[CH3:1][CH:2]1[CH2:8][C:7]2[CH:9]=[C:10]3[O:15][CH2:14][O:13][C:11]3=[CH:12][C:6]=2[C:5]([C:16]2[CH:21]=[CH:20][C:19]([N+:22]([O-:24])=[O:23])=[CH:18][CH:17]=2)=[N:4][N:3]1[C:25](=[N:27][OH:28])[NH2:26].[C:29](OC(=O)C)(=O)[CH3:30]>O>[CH3:1][CH:2]1[CH2:8][C:7]2[CH:9]=[C:10]3[O:15][CH2:14][O:13][C:11]3=[CH:12][C:6]=2[C:5]([C:16]2[CH:21]=[CH:20][C:19]([N+:22]([O-:24])=[O:23])=[CH:18][CH:17]=2)=[N:4][N:3]1[C:25]1[N:26]=[C:29]([CH3:30])[O:28][N:27]=1

Participants

4

Reactant 2

HCID 7918Acetic AnhydrideHCID 86593811(+/-)-8-Methyl-5-(4-nitrophenyl)-8,9-dihydro-7H-1,3-dioxolo[4,5-h][2,3]benzodiazepine-7-carbamidoxime

Product 1

HCID 22565454(+/-)-8-Methyl-7-(5-methyl-1,2,4-oxadiazol-3-yl)-5-(4-nitrophenyl)-8,9-dihydro-7H-1,3-dioxolo[4,5-h][2,3]benzodiazepineYield 50%

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Conditions

Temperature
110 °C

Procedure

A mixture of 3.0 g (7.82 mmol) of the starting material XXIV and 15 ml of acetic anhydride was stirred at 110° C. for 1 h, then after cooling it was diluted with water and extracted with dichloromethane. The organic layer was concentrated and the residue was purified by column chromatography using silica gel (MN Kieselgel 60) as adsorbent and a mire of n-hexane-ethyl acetate (2:1) as eluent to yield 1.58 g (50%) of the title compound; Mp.: 191-200° C.

Workup

  1. temperatureafter cooling it
  2. extractionextracted with dichloromethane
  3. concentrationThe organic layer was concentrated
  4. customthe residue was purified by column chromatography

Sources & evidence

ORD record
ord-08cbedf087054ee4b40bcd82783a63bd
Source dataset
uspto-grants-2005_02
Patent number
US06858605B2

Reaction notes

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