methanol; Montmorillonite K-10 clay T=20°C; Methanolytic deprotection;

1,4-diaza-bicyclo[2.2.2]octane; Bi(NO3)3·5H2O 0.05 h; Microwave irradiation;

1.1: n-butyllithium; N,N,N',N,-tetramethylethylenediamine / hexane; diethyl ether / 1 h / 0 °C / |Inert atmosphere 1.2: -78 - 20 °C / |Inert atmosphere 2.1: n-butyllithium; N,N,N',N,-tetramethylethylenediamine / hexane; diethyl ether / 1 h / 0 °C / |Inert atmosphere 2.2: -78 - 20 °C / |Inert atmosphere 3.1: hydrogenchloride / water; methanol / 2 h / 0 - 20 °C / |Inert atmosphere View Scheme