Potassium Phosphate, Tribasic → HCID 76567969, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of racemic (2′R,3R,4′S)-6-bromo-4′-(3-chlorophenyl)-2′-isopropenyl-2,6′-dioxospiro[indole-3,3′-piperidine]-1-carboxylic acid tert-butyl ester-1,3-dihydro-indole-2-one (54 mg, 0.1 mmol) prepared in example 173a, Pd(PPh3)4 (20 mg, 0.02 mmol), K3PO4 (110 mg, 0.5 mmol), dimethyl trimethylsilylethynylborate (1 mL, 0.5 M, 0.5 mmol) in toluene (3 mL) was heated under microwave irradiation at 130° C. for 1 hour. The solvent was removed in vacuo. To the residue was added methanol (3 mL) and aqueous NaOH (2 N, 3 mL). The mixture was stirred at room temperature for 2 h. The solvent was removed in vacuo, the residue was diluted with ethyl acetate (20 mL), washed with brine, saturated NH4Cl, brine, then organic layer was separated, and concentrated. The residue was purified by preparative HPLC to give racemic (2′R,3R,4′S)-4′-(3-chlorophenyl)-6-ethynyl-2′-isopropenylspiro[3H-indole-3,3′-piperidine]-2,6′(1H)-dione (2 mg).

Provenance & Evidence