1-Chloroethyl chloroformate → HCID 9976793, compound

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Reaction Steps

A stirred solution of 1-[(1-benzyl-pyrrolidin-2-yl)methyl]-3-(3-chlorophenyl-sulfonyl)-1H-pyrrolo[2,3-b]pyridine (0.812 g, 1.74 mmol) in 1,2-dichloroethane under a nitrogen atmosphere is treated with 1-chloroethylchloroformate (0.47 mL, 4.35 mmol); heated at reflux temperature until the disappearance of starting material by thin layer chromatography (3 h), cooled and concentrated in vacuo. The resultant residue is dissolved in CH2Cl2 and re-evaporated twice. This residue is dissolved in ethanol, heated at reflux temperature for 1.5 h, cooled to room temperature, diluted with water, and extracted with ethyl acetate. The extracts are combined, washed sequentially with water and brine, and concentrated in vacuo. The final residue is purified by flash column chromatography (10–15% methanol in CH2Cl2 as eluent) to afford the title compound as an oil, 443 mg (68% yield), identified by HNMR and mass spectral analyses.

Provenance & Evidence