A highly diastereoselective protocol for the crotylation reaction of aldehydes using potassium (<em>Z</em>) and (<em>E</em>)-crotytrifluoroborates was developed. Benzamidoxime was employed as a renewable catalyst, which was easily recovered through a simple extraction process. This method proved to be simple, fast, regio- and chemoselective for different aldehydes. The corresponding homoallylic alcohols were obtained in good to excellent yields without the need of further purification.