Asymmetric synthesis of γ-chloro-α,β-diamino- and β,γ-aziridino-α-aminoacylpyrrolidines and -piperidines via stereoselective Mannich-type additions of <i>N</i>-(diphenylmethylene)glycinamides across α-chloro-<i>N</i>-sulfinylimines
作者:Gert Callebaut、Sven Mangelinckx、Pieter Van der Veken、Karl W Törnroos、Koen Augustyns、Norbert De Kimpe
DOI:10.3762/bjoc.8.239
日期:——
3S)-gamma-chloro-alpha,beta-diaminocarboxylamides were formed with the opposite enantiotopic face selectivity as compared to the (S(S),2R,3R)-gamma-chloro-alpha,beta-diaminocarboxyl esters obtained via Mannich-type addition of analogous N-(diphenylmethylene)glycine esters across a chiral alpha-chloro-N-p-toluenesulfinylaldimine. Selective deprotection under different acidic reaction conditions and ring closure of the
新的手性 γ-氯-α,β-二氨基羧酰胺衍生物的不对称合成由 N-(二苯基亚甲基)甘氨酰胺跨手性 α-氯-Np-甲苯亚磺酰基醛亚胺的高度非对映选择性曼尼希型反应得到了开发。生成的 (S(S),2S,3S)-γ-氯-α,β-二氨基羧酰胺与 (S(S),2R,3R)-γ-氯-α 相比具有相反的对映面选择性,β-二氨基羧基酯通过类似的 N-(二苯基亚甲基)甘氨酸酯与手性 α-氯-Np-甲苯亚磺酰基醛亚胺的曼尼希型加成获得。优化了不同酸性反应条件下的选择性脱保护和γ-氯-α,β-二氨基羧酰胺的闭环,得到了N(α)-脱保护的syn-γ-氯-α,β-二氨基羧酰胺,