1: allylsulfonylbenzene With n-butyllithium in tetrahydrofuran; hexane T=-78°C; 0.5 h; 2: hexanal in tetrahydrofuran; hexane T=-78°C; 1 h; 3: With potassium hydroxide; acetic anhydride in tetrahydrofuran; hexane; water T=-78 - 20°C; 2 h; Further stages. Title compound not separated from byproducts.;

1.1: n-BuLi / tetrahydrofuran; hexane / 0.5 h / -78 °C 1.2: tetrahydrofuran; hexane / 1 h / -78 °C 1.3: tetrahydrofuran; hexane / -78 - 20 °C 2.1: aq. KOH / tetrahydrofuran; hexane / 2 h View Scheme

1.1: n-BuLi / tetrahydrofuran; hexane / 0.5 h / -78 °C 1.2: tetrahydrofuran; hexane / 1 h / -78 °C 1.3: tetrahydrofuran; hexane / -78 - 20 °C 2.1: aq. KOH / tetrahydrofuran; hexane / 2 h View Scheme

1: Et3N / CH2Cl2 2: MCPBA / CH2Cl2 3: NaI / acetone 4: Bu3SnH, AIBN / benzene / 16 h / Heating View Scheme

Multistep reaction;

1: Et3N 2: MCPBA View Scheme