Water → 6-Acetyl-3,4-dihydro-2,2-dimethyl-trans-4-(2-oxo-1-pyrrolidinyl)-2H-benzo[b]pyran-3-ol

HRID 543472Notes

Reaction equation

HRID 543472 reaction equation
[C:1]([C:4]1[CH:16]=[CH:15][C:7]2[O:8][C:9]([CH3:14])([CH3:13])[CH:10]3[O:12][CH:11]3[C:6]=2[CH:5]=1)(=[O:3])[CH3:2].[NH:17]1[CH2:21][CH2:20][CH2:19][C:18]1=[O:22].[H-].[Na+].O>CS(C)=O.C(OCC)(=O)C>[C:1]([C:4]1[CH:16]=[CH:15][C:7]2[O:8][C:9]([CH3:14])([CH3:13])[C@@H:10]([OH:12])[C@H:11]([N:17]3[CH2:21][CH2:20][CH2:19][C:18]3=[O:22])[C:6]=2[CH:5]=1)(=[O:3])[CH3:2]

Participants

7

Reactant 4

HCID 962WaterHCID 120252-PyrrolidoneHCID 24758Sodium hydrideHCID 13222927HCID 13222927, compound

Product 1

HCID 131511866-Acetyl-3,4-dihydro-2,2-dimethyl-trans-4-(2-oxo-1-pyrrolidinyl)-2H-benzo[b]pyran-3-ol

Reagents, catalysts & solvents 2

HCID 679Dimethyl SulfoxideSolventHCID 8857Ethyl AcetateSolvent

Procedure

6-Acetyl-3,4-dihydro-2,2-dimethyl-3,4-epoxy-2H-benzo[b]pyran (0.33 g, prepared as described in Example 1 of U.K. Pat. No. 1,511,187), and 2-pyrrolidone (0.15 g), were stirred in dimethylsulphoxide (25 ml) under nitrogen at room temperature. Sodium hydride (0.5 g, 80%) was added during 2 mins and the reaction stirred for a further 22 hours. Addition of water, extraction with ethyl acetate, drying of the organic layer with magnesium sulphate, filtration, evaporation and recrystallisation from ethyl acetate gave the title compound (0.04 g) of m.p. 218°-219°.

Workup

  1. dry with materialdrying of the organic layer with magnesium sulphate, filtration, evaporation and recrystallisation from ethyl acetate

Sources & evidence

ORD record
ord-419ed56fd08a46f38f2719bb040790d1
Source dataset
uspto-grants-1984_05
Patent number
US04446113

Reaction notes

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