(S)-2-(4-chloro-3-trifluoromethoxy-phenylamino)-propionic acid 、
{3-[(S)-4-(tert-butyl-dimethyl-silanyloxy)-6-aza-spiro[2.5]oct-6-yl]-propyl}-(2,2-dimethoxy-ethyl)-amine 、 (S)-N-{3-[(S)-4-(tert-butyl-dimethyl-silanyloxy)-6-aza-spiro[2.5]oct-6-yl]-propyl}-2-(4-chloro-3-trifluoromethoxy-phenylamino)-N-(2,2-dimethoxy-ethyl)-propionamide 、 (S)-1-{3-[(S)-4-(tert-butyl-dimethyl-silanyloxy)-6-aza-spiro[2.5]oct-6-yl]-propyl}-4-(4-chloro-3-trifluoromethoxy-phenyl)-3-methyl-piperazin-2-one 生成 (S)-4-(4-chloro-3-trifluoromethoxy-phenyl)-1-[3-((S)-4-hydroxy-6-aza-spiro[2.5]oct-6-yl)-propyl]-3-methyl-piperazin-2-one