1: With thiophenol; triethylamine; tin(ll) chloride in acetonitrile T=0°C; Nef reaction; 0.166667 h; Inert atmosphere; 2: With SnCl2·2H2O; ethanol; L-(+)-tartaric acid; water; sodium hydrogencarbonate; sodium hydrogensulfite T=40°C; Nef reaction; 18 h;