methanol; C17H23BN2O T=25°C; P=760.051 Torr; 6 h; Inert atmosphere; chemoselective reaction;

1: (S)-1-(4-benzyl-2-thioxothiazolidin-3-yl)-propan-1-one With titanium tetrachloride; N-ethyl-N,N-diisopropylamine in tetrahydrofuran T=0°C; 0.416667 h; Inert atmosphere; 2: propionyl chloride in tetrahydrofuran T=0°C; 48 h; Inert atmosphere; regioselective reaction;

1: (S)-1-(4-benzyl-2-thioxothiazolidin-3-yl)-propan-1-one With titanium tetrachloride; N-ethyl-N,N-diisopropylamine in tetrahydrofuran T=0°C; 0.416667 h; Inert atmosphere; 2: phenylacetyl chloride in tetrahydrofuran T=0°C; 48 h; Inert atmosphere; regioselective reaction;