zirconium tetrachloride in dichloromethane T=20°C; Michael addition; 0.0833333 h;

1: With tris-(dibenzylideneacetone)dipalladium(0); (R,R)-anthracenyl Trost ligand in tetrahydrofuran T=0°C; 0.0333333 h; Inert atmosphere; 2: With B-n-hexyl-9-borabicyclo[3.3.1]nonane in tetrahydrofuran T=0°C; 16 h; Inert atmosphere; enantioselective reaction;