1,1'-(9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(1,1-diphenylphosphine) → Carbamic acid, N-[1-(6-hydroxy-3-quinolinyl)-3-pyrrolidinyl]-, 1,1-dimethylethyl ester

Participants

Reaction Conditions

Reaction Steps

A mixture of Intermediate A (1.50 g, 5.07 mmol), tert-butyl pyrrolidin-3-ylcarbamate (1.13 g, 6.09 mmol), Pd2(dba)3 (0.232 g, 0.254 mmol), Xantphos (0.294 g, 0.507 mmol) and KOtBu (1.14 g, 10.2 mmol) in DMF (15 mL) was bubbled with argon for 20 min. The result mixture was heated at 110° C. overnight. The solution was cooled to rt and the solvent was removed under reduced pressure. The residue was diluted with water, extracted with DCM three times. The combined organic phase was dried over anhydrous Na2SO4, filtered and concentrated. The crude product was purified by chromatography (eluting with 5% MeOH in DCM) to give the title compound as yellow solid (0.2 g, yield 11%). LCMS (method N): [M+H]+=330, tR=1.93 min.

Provenance & Evidence