sodium hydroxide in ethanol 4 h; Heating;

1.1: lithium hexamethyl-disilazide / tetrahydrofuran / 0.5 h / -78 °C 1.2: tetrahydrofuran / 2 h / -78 - 25 °C 2.1: aq. NaOH / ethanol / 4 h / Heating View Scheme

T=60 - 100°C; 5 h;