1: CH2Cl2 / 0.5 h / 0 °C 2: 1.) methyllithium / 1.) THF, 0 deg C, 1 h; 2.) THF, RT, overnight View Scheme

1: With 4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl-4',4',5',5'-tetramethyl-1,3,2-dioxaborolane in acetonitrile T=20°C; 0.0833333 h; Inert atmosphere; 2: With ethylenediamine in acetonitrile T=20°C; 1 h;

Reduktion;

1: 62 percent / TFAA 2: 37 percent / Zn; AcOH / tetrahydrofuran / 2 h / 20 °C View Scheme

trifluoroacetic anhydride