1: 4,8-dimethyl-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1,3,6,2-dioxazaborocane With copper(l) chloride in dichloromethane 0.166667 h; Inert atmosphere; 2: 2-Propenoic acid tert-butyl ester in methanol; dichloromethane T=0 - 20°C; 24 h; Inert atmosphere;

lithium diisopropyl amide in tetrahydrofuran T=-78 - 20°C;

1: 4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl-4',4',5',5'-tetramethyl-1,3,2-dioxaborolane With bis[2-(diphenylphosphino)phenyl] ether; copper(l) chloride; sodium t-butanolate in tetrahydrofuran 0.5 h; Inert atmosphere; 2: 2-Propenoic acid tert-butyl ester in tetrahydrofuran; methanol 3 h; Inert atmosphere;

multistep reaction: enolate alkylation; other substrates;