Methyl iodide → (5S)-5-(p-toluenesulphonylmethyl)-1-methyl-2-pyrrolidinone

HRID 1791835Notes

Reaction equation

[C:1]1([CH3:17])[CH:6]=[CH:5][C:4]([S:7]([CH2:10][C@H:11]2[NH:15][C:14](=[O:16])[CH2:13][CH2:12]2)(=[O:9])=[O:8])=[CH:3][CH:2]=1.[CH:18]([N-]C(C)C)(C)C.[Li+].CI>C1COCC1>[C:1]1([CH3:17])[CH:2]=[CH:3][C:4]([S:7]([CH2:10][C@H:11]2[N:15]([CH3:18])[C:14](=[O:16])[CH2:13][CH2:12]2)(=[O:9])=[O:8])=[CH:5][CH:6]=1

Participants

Conditions

Temperature: -70 °C

Procedure

(5S)-5-(p-Toluenesulphonylmethyl)-2-pyrrolidinone (0.8 g, 3 mmol) was dissolved in dry THF and cooled to −70° C. Lithium diisopropylamide was slowly added and the reaction stirred for 20 minutes before addition of methyl iodide (2 ml, excess). The reaction was allowed to warm to ambient temperature for over 2 hours. The reaction was partitioned between ethyl acetate and water, the organic layer separated, dried over MgSO4, filtered, and evaporated in vacuo. The residue was purified by flash chromatography eluting from methylene chloride to 5% methanol/95% methylene chloride and the product evaporated to give (5S)-5-(p-toluenesulphonyl-methyl)-1-methyl-2-pyrrolidinone (340 mg, 40%) as a brown oil.

Workup

temperatureto warm to ambient temperature for over 2 hours
customThe reaction was partitioned between ethyl acetate and water
customthe organic layer separated
dry with materialdried over MgSO4
filtrationfiltered
customevaporated in vacuo
customThe residue was purified by flash chromatography
washeluting from methylene chloride to 5% methanol/95% methylene chloride
customthe product evaporated

Sources & evidence

ORD record: ord-3e589ae133f241e1a9ea020855ba8f22
Source dataset: uspto-grants-2006_07
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07074800B1

Reaction notes

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