Boron tribromide → HCID 86663251, compound

Participants

Reaction Steps

To 1-(2-methoxyphenyl)cyclobutanecarboxamide (Example 268a, 4.19 g) at 0° C. in dichloromethane (20 mL) was aded boron tribromide (40.8 mL, 1M in dichloromethane) and the reaction warmed to room temperature over 3 h. It was poured into ice, extracted with dichloromethane (×3) and the combined organics were dried (MgSO4) and the solvent was removed in vacuo to give crude 1-(2-hydroxyphenyl)cyclobutanecarboxamide (2.96 g). This was dissolved in DMF (20 mL) and potassium carbonate (2.14 g) and benzyl bromide (1.84 mL) were added and the reaction stirred for 16 h. Water and ethyl acetate were added and the organic layer separated. The aqueous layer was extracted further with ethyl acetate. The combined organics were washed with water (×3), brine, dried (Na2 SO4) and the solvent was removed in vacuo. The residue was purified (SiO2 chromatography eluting with 5-50% ethyl acetate in iso-hexane) to afford the subtitle product (1.98 g).

Provenance & Evidence