sodium hydride; bis[2-(diphenylphosphino)phenyl] ether; tris(dibenzylideneacetone)dipalladium(0) chloroform complex in tetrahydrofuran Heating;

1: CH(CH2CH=CH2)(CO2Me)2 With sodium hydride in tetrahydrofuran 2: allenylmethyl bromide in tetrahydrofuran T=60°C;