in tetrahydrofuran; tetrahydrofuran.A; water

1: (2S)-pyrrolidine-1,2-dicarboxylic acid 1-methyl ester With [bis(acetoxy)iodo]benzene; iodine in dichloromethane T=20°C; oxidative decarboxylation; 3 h; 2: allyl-trimethyl-silane With boron trifluoride diethyl etherate T=20°C; Alkylation; 4 h; Further stages.;

1: (2S)-pyrrolidine-1,2-dicarboxylic acid 1-methyl ester With [bis(acetoxy)iodo]benzene; iodine in dichloromethane T=20°C; Decarboxylation; 3 h; 2: allyl-trimethyl-silane With boron trifluoride diethyl etherate T=0 - 20°C; allylation; 4 h;

1: (2S)-pyrrolidine-1,2-dicarboxylic acid 1-methyl ester With [bis(acetoxy)iodo]benzene; iodine in dichloromethane T=20°C; oxidative decarboxylation; 3 h; 2: methanol T=20°C; Methylation; 0.75 h; Further stages.;

[bis(acetoxy)iodo]benzene; iodine in dichloromethane T=20°C; Decarboxylation; 3 h;