3-carboxymethyl-1-oxyl-2,2,6,6-tetramethyl-4-piperidone with (R)-α-methylbenzylamine, NaBH3CN reduction of the resulting enamine and removal of the chiral auxiliary from the separated diastereoisomers, led to enantiomerically pure (3S,4S) and (3R,4R) methyl 4-amino-1-oxyl-2,2,6,6-tetramethylpiperidine-3-carboxylates.
用(R)-α-甲基
苄胺胺化3-羧甲基-1-氧基-1,2,2,6,6-四甲基-
4-哌啶酮,NaBH 3 CN还原所得烯胺并从分离的非对映异构体中除去手性助剂生成对映体纯的(3 S,4 S)和(3 R,4 R)4-
氨基-1-氧基-1,
2,2,6,6-四甲基哌啶-3-
羧酸甲酯。