2-Dicyclohexylphosphino-2',6'-dimethoxybiphenyl → tert-Butyl 3-(4-(2-(4-chloro-5-cyclobutyl-2-methoxyphenylamino)acetyl)piperazin-1-yl)azetidine-1-carboxylate

Participants

Reaction Conditions

Reaction Steps

A mixture of tert-butyl 3-(4-(2-(4-chloro-5-iodo-2-methoxyphenylamino)acetyl)piperazin-1-yl)azetidine-1-carboxylate (697 mg, 1.24 mmol), cyclobutylzinc bromide (4.46 mL, 2.23 mmol, 0.5 M in THF), Pd(OAc)2 (56 mg, 0.248 mmol), and S-Phos (102 mg, 0.248 mmol) in THF (15 mL) was stirred at 65° C. under argon for 16 h. The mixture was allowed to cool to RT, quenched with aqueous NH4Cl solution and then extracted with ethyl acetate. The organic layer was washed with brine, dried over Na2SO4, filtered and concentrated in vacuo. The residue was purified by flash column chromatography on silica gel (methanol/dichloromethane=1:30) to afford the desired product (596 mg, 98% yield) as a brown oil. ESI-MS m/z: 493.5[M+H]+.

Provenance & Evidence