in tetrahydrofuran T=0°C; 1 h;

1: bis-diphenylphosphine With n-butyllithium in tetrahydrofuran; hexane T=20°C; 0.5 h; Inert atmosphere; 2: 2-chloro-6-tert-amylpyridine in tetrahydrofuran; hexane T=0 - 20°C; Inert atmosphere;