1: N-phenyl-carbamic acid-ethyl ester With sodium hydride in tetrahydrofuran; mineral oil T=0 - 20°C; 2: 3-bromo-2-methylprop-1-ene in tetrahydrofuran; mineral oil

1.1: sodium hydride / tetrahydrofuran; mineral oil / 0 - 20 °C / Inert atmosphere 2.1: sodium hydride / tetrahydrofuran; mineral oil / 0 - 20 °C 2.2: 20 °C View Scheme