Dimethyl Sulfide → 1-(Phenylsulfonyl)-1,3,4,5-tetrahydropyrrolo[4,3,2-de]isoquinoline

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Reaction Steps

SMe2 (205 μL, 2.2 mmol) was added dropwise over 5 min. to a refluxing mixture of 1-(phenylsulfonyl)-3,4-dihydropyrrolo[4,3,2-de]isoquinolin-5(1H)-one, Intermediate 2, (225 mg, 0.72 mmol) in dry THF (10 mL) with continuous reflux for 2.5 h. Additional two portions BH3:SMe2 (100 μL×2) were added (2.5 h reflux between the additions). Reflux was continued for 5 h after the last addition, then room temperature over night. The reaction was quenched by addition of HCl in MeOH (1.25 M, 4 mL) and reflux 1 h. The solvent was evaporated and the crude mixture was extracted with DCM (×2) and sat. Na2CO3(aq). The organic layers were combined, dried and concentrated. Purification was performed by flash column chromatography (3-5% MeOH in DCM) which gave 66 mg of the title compound as a beige solid. MS m/z 299 [M+H]+.

Provenance & Evidence