There is disclosed a novel method for the syntheses of chiral pyrrolidines and piperidines by the intramolecular ring closure of anomeric mixtures of 4-amino- and 5-amino-2-trifluoromethanesulfonates of methyl furanosides. The novel method preferably provides for the efficient syntheses from diacetone glucose of 1,4-dideoxy-1,4-imino-D-arabinitol--known as DAB1, (2S,3R,4R)-3,4-dihydroxyproline, fagomine [1,5-imino-1,2,5-trideoxy-D-arabino-hexitol], and (2S,3R,4R)-3,4-dihydroxypipecolic acid by intramolecular nucleophilic displacement by an amino function of 2-O-trifluoromethanesulphonates of anomeric mixtures of methyl furanosides.
本发明揭示了一种新颖的方法,通过对甲基
呋喃苷的4-
氨基和5-
氨基-2-
三氟甲磺酸酯的异构混合物进行分子内环闭合,合成手性
吡咯烷和
哌啶。这种新方法优选地提供了从
双丙酮葡萄糖合成1,4-二去氧-1,4-
亚胺-
D-阿拉伯糖醇(称为
DAB1)、(2S,3R,4R)-3,4-二羟基脯
氨酸、法果胺[1,5-
亚胺-1,2,5-三去氧-
D-阿拉伯糖醇]以及(2S,3R,4R)-3,4-二羟基哌酰胺的高效合成,通过对甲基
呋喃苷的异构混合物的2-O-三
氟甲基磺酸酯的分子内亲核取代反应实现。