1: phenyllithium With 3-butyl-1,1-diethyl-1,3-dihydrobenzo[c][1,2]oxasilole in tetrahydrofuran; anhydrous butyl ether T=-78 - 20°C; Inert atmosphere; 2: (iPr)2N-OBz With copper(l) iodide; dpca in tetrahydrofuran; anhydrous butyl ether T=20°C; 2 h; Inert atmosphere;

copper dichloride in tetrahydrofuran; diethyl ether T=20°C; 1 h;

1: triphenyl boroxine With potassium carbonate in 1,4-dioxane T=130°C; 24 h; Inert atmosphere; 2: (iPr)2N-OBz in 1,4-dioxane Inert atmosphere;

in toluene T=25°C; 1 h; Inert atmosphere;

1: methyl phosphonic acid,diethyl ester With Zn(2,2,6,6-tetramethylpiperidide)2 in toluene T=20°C; 1 h; 2: (iPr)2N-OBz With [2,2']bipyridinyl; copper dichloride in tetrahydrofuran; toluene T=20°C;

Cu(I)-tert-butoxide; 9,9-dimethyl-4,5-bis(diphenyl-phosphino)xanthene; lithium tert-butylate in 2,2,4-trimethylpentane; toluene T=60°C; Inert atmosphere;