Stereo- and Enantioselective Syntheses of (Z)-1,3-Butadienyl-2-carbinols via Brønsted Acid Catalysis

A Brønsted acid-catalyzed enantioselective synthesis of (Z)-1,3-butadienyl-2-carbinols is developed. By employing a chiral phosphoric acid as the catalyst, a variety of 1,3-butadienyl-2-carbinols were obtained in good yields with excellent Z-selectivities and enantiopurities from α-alkyl-substituted homoallenyl boronates.