A Convenient Preparation of an Orthogonally ProtectedCα,Cα‐Disubstituted Amino Acid Analog of Lysine: 1‐tert‐butyloxycarbonyl‐4‐((9‐fluorenylmethyloxycarbonyl)amino)‐piperidine‐4‐carboxylic Acid

Abstract DMAP(4‐Dimethylamino)pyridine 1‐ tert ‐Butoxycarbonylpiperidine‐4‐spiro‐5′‐(1′,3′‐bis(tert‐butoxycarbonyl)hydantoin 4‐Amino1‐ tert‐ butoxycarbonylpiperidine‐4‐carboxylic acid 1 ‐tert ‐Butyloxycarbonyl‐4‐(9‐fluorenylmethyloxyamino)piperidine‐4‐carboxylic acid 9‐Fluorenylmethyl chlorformate 4‐Piperidone monohydrate hydrochloride Piperidine‐4‐spiro‐5′‐hydantoin