1: With pyridine; chloroformic acid ethyl ester in toluene T=25°C; CoolingInert atmosphere; 2: With 1,5-bis-(diphenylphosphino)-pentane; palladium diacetate T=60 - 105°C; Inert atmosphere;

1: 3,3-dimethyl-cyclohexanone With lithium diisopropyl amide in tetrahydrofuran T=-78°C; 2 h; 2: N,N-bis(trifluoromethanesulfonyl)aniline in tetrahydrofuran T=-78 - 0°C; 3 h; 3: vinyl-tributylstannane With tetrakis(triphenylphosphine) palladium(0); lithium chloride in tetrahydrofuran 36 h; Reflux;