Triphenylphosphine → HCID 86685699, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of 3-{1-[5-Bromo-2-(2-ethyl-butoxy)-benzyl]-5-methyl-1H-pyrazol-3-yl}-propionic acid methyl ester (0.0774 g, 0.18 mmol), [PdCl2(PPh3)]2 (0.007 g, 0.01 mmol), PPh3 (0.0094 g, 0.018 mmol) mmol), CuI (2 mg, 0.01 mmol), trimethylsilylacetylene (0.0196 g, 0.2 mmol), Et2N (0.07314 g, 2.72 mmol in DMF (1 ml) heated at 120° C. in a microwave reactor under a N2 atmosphere for 50 min. The mixture was partitioned between 0.1 M HCl and EtOAc. The organic layer was washed with brine, dried (MgSO4) and evaporated to dryness. The residue was purified by MPLC (20 g SiO2 cartridge, eluent 90% iso-hexane-10% EtOAc) yielding 3-{1-[5-trimethylsilanylethynyl-2-(2-ethyl-butoxy)-benzyl]-5-methyl-1H-pyrazol-3-yl}-propionic acid methyl ester (0.0396 g). This was dissolved in THF (20 ml), MeOH (20 ml), glacial acetic acid (8 ml) and Bu4NF solution (24 ml, 1M) was added. The mixture was stirred at RT overnight then heated at 60° C. for 3 hours, thereafter cooled to RT and partitioned between sat. NH4Cl solution and EtOAc, the organic layer was washed with brine, dried (MgSO4) and evaporated to dryness. The residue was purified by MPLC (20 g SiO2 cartridge, eluent 85% iso-hexane-15% EtOAc) yielding 3-{1-[5-Ethynyl-2-(2-ethyl-butoxy)-benzyl]-5-methyl-1H-pyrazol-3-yl}-propionic acid methyl ester (0.0078 g) which was converted to the title compound following the method in Example 1, Step 8.

Provenance & Evidence