1: With n-butyllithium; 2-Bromo-1,3,5-trimethyl-benzene in tetrahydrofuran; pentane T=-78°C; 1.5 h; 2: 2-methoxy-pyridine in tetrahydrofuran; pentane T=-78 - 20°C; 2.08333 h; 3: cyclopent-3-enecarboxylic acid methoxy-methyl-amide in tetrahydrofuran; pentane T=-78 - 20°C; 18.0833 h;

mesityllithium in tetrahydrofuran T=-78°C;

potassium hydroxide; hydrazine in water; ethylene glycol T=100 - 180°C; 18 h;