1: With palladium diacetate; triphenylphosphine; sodium t-butanolate in o-xylene T=120°C; 3 h; Inert atmosphere; 2: With palladium diacetate; 1,8-diazabicyclo[5.4.0]undec-7-ene; PCy3∙HBF4 in N,N-dimethyl acetamide; o-xylene T=145°C; 16 h; Inert atmosphere;