Triphenylphosphine → 2-{(RS)-1-[(3SR,4RS)-1-Benzyl-4-(3,4-dichloro-phenyl)-pyrrolidin-3-yl]-ethoxy}-5-chloro-pyridine

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Reaction Steps

To a suspension of PPh3 (PPh3 polymer bound, 3 mmol PPh3/g resin) (3.14 g, 9.4 mmol) in THF (70 mL) at 0° C. were added 5-chloro-pyridin-2-ol (0.832 g, 6.42 mmol) and then DBAD (1.578 g, 6.85 mmol). After 5 minutes was added (SR)-1-[(3SR,4RS)-1-benzyl-4-(3,4-dichloro-phenyl)-pyrrolidin-3-yl]-ethanol (X-B-1) (1.50 g, 4.28 mmol). The reaction mixture was stirred over night at RT, filtered on celite and concentrated under vacuo. Extraction with EtOAc/aq.NaOH 1M, followed by column chromatography (SiO2, EtOAc/H, 1:6) yielded 1.71 g (87%) of the title compound as a colorless oil. ES-MS m/e: 461.2 (M+H+).

Provenance & Evidence