lithium diisopropyl amide 1.) THF, hexane, -78 deg C, 45 min, 2.) THF, hexane, 2 h; Yield given. Multistep reaction. Yields of byproduct given. Title compound not separated from byproducts;

1.1: pyridine / CH2Cl2 / 2 h / 0 - 20 °C 2.1: 3.2 g / acetone / toluene / 1 h / Heating 3.1: LDA / tetrahydrofuran; hexane / 2 h / -40 °C 3.2: tetrahydrofuran; hexane / -78 - 20 °C View Scheme

1.1: 3.2 g / acetone / toluene / 1 h / Heating 2.1: LDA / tetrahydrofuran; hexane / 2 h / -40 °C 2.2: tetrahydrofuran; hexane / -78 - 20 °C View Scheme