Water → 3,4-dihydro-1,10-dimethyl-1H-1,4-oxazino[4,3-a]indole-1-acetic acid ethyl ester
Reaction equation
[CH3:1][C:2]1[C:10]2[C:5](=[CH:6][CH:7]=[CH:8][CH:9]=2)[N:4]([CH2:11][CH2:12][OH:13])[CH:3]=1.[C:14]([O:20][CH2:21][CH3:22])(=[O:19])[CH2:15][C:16]([CH3:18])=O.C1(C)C=CC(S(O)(=O)=O)=CC=1.O>C1(C)C=CC=CC=1>[CH2:21]([O:20][C:14](=[O:19])[CH2:15][C:16]1([CH3:18])[C:3]2=[C:2]([CH3:1])[C:10]3[CH:9]=[CH:8][CH:7]=[CH:6][C:5]=3[N:4]2[CH2:11][CH2:12][O:13]1)[CH3:22]Participants
6
Procedure
A mixture of the intermediate of formula III, 3-methylindole-1-ethanol(26.5 g., 0.15 mole), described in Example 1, in toluene (600 ml.), ethyl acetoacetate (36 g., 0.20 mole) and p-toluenesulfonic acid (2.0 g.) is heated at reflux for 6 hr. using a water separator. The toluene solution is washed with water, 5% bicarbonate, solution, and again with water. The solution is then dried over sodium sulfate and the solvent evaporated under reduced pressure to give an oil. The oil was subjected to chromatography on silica gel. Elution with 10% ethyl acetate in benzene and concentration of the eluate affords the ester, 3,4-dihydro1,10-dimethyl-1H-1,4-oxazino[4,3-a]indole-1-acetic acid ethyl ester, as an oil, γmaxfilm 1725 cm-1.
Workup
- temperatureat reflux for 6 hr
- washThe toluene solution is washed with water, 5% bicarbonate, solution
- dry with materialThe solution is then dried over sodium sulfate
- customthe solvent evaporated under reduced pressure
- customto give an oil
- washElution with 10% ethyl acetate in benzene and concentration of the
Sources & evidence
- ORD record
- ord-daac555ade124b9a97fe6dad3f8ec859
- Source dataset
- uspto-grants-1976_06
- Patent number
- US03962236
Reaction notes
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