Multi-step reaction with 3 steps
1: (R)-3,3'-bis[4-methyl-3,5-dinitrophenyl]-1,1'-binaphthyl-2,2'-disulfonimide; di-tert-butyl 1,4-dihydro-2,6-dimethyl-3,5-pyridine-dicarboxylate / 1,3,5-trimethyl-benzene / 120 h / 10 °C / Inert atmosphere
2: hydrogenchloride / 1,3,5-trimethyl-benzene; 1,4-dioxane / 4 h / 50 °C / Inert atmosphere
3: hydrogenchloride / diethyl ether / 0 °C / Inert atmosphere
With
hydrogenchloride; (R)-3,3'-bis[4-methyl-3,5-dinitrophenyl]-1,1'-binaphthyl-2,2'-disulfonimide; di-tert-butyl 1,4-dihydro-2,6-dimethyl-3,5-pyridine-dicarboxylate;
In
1,4-dioxane; diethyl ether; 1,3,5-trimethyl-benzene;
DOI:10.1002/anie.201504052