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

HRID 64910Notes

Reaction equation

HRID 64910 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 (0.05 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-9452d4c7bc3c49c0a06666b3ee328028
Source dataset
uspto-grants-1986_09
Patent number
US04610992

Reaction notes

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