1: PDPM With ethylmagnesium bromide in tetrahydrofuran T=20°C; Metallation; 0.5 h; 2: benzoyl chloride in tetrahydrofuran Acylation; 2 h; Further stages.;

1: indium(III) chloride / 1.5 h / 20 °C / |Inert atmosphere 2: ethylmagnesium bromide / toluene / 1.33 h / 20 °C / |Inert atmosphere View Scheme