1: 3-allyl-1-chloropiperidin-2-one in dichloromethane T=-78°C; 4.5 h; UV-irradiationInert atmosphere; 2: methanol With potassium carbonate T=20°C; 16 h; Inert atmosphere;

With  N-chloro-succinimide; potassium tert-butylate in  tetrahydrofuran T=20°C; 0.75 h;  Inert atmosphere;