1: (E)-3-(benzo[1,3]dioxol-5-yl)acrylic acid With N-bromosuccinmide; tetrabutyl-ammonium trifluoroacetate in 1,2-dichloro-ethane T=20°C; Decarboxylation; bromination; Hunsdiecker reaction; 4 h; 2: 1-piperidylprop-2-en-1-one With palladium diacetate; tri-phenyl-antimony; triethylamine in 1,2-dichloro-ethane Heck reaction; 20 h;

palladium diacetate; triethylamine; triphenylphosphine; lithium chloride in acetonitrile T=70 - 80°C; 18 h;