申请人:MONSANTO COMPANY
公开号:EP0439444A2
公开(公告)日:1991-07-31
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.
本发明公开了一种通过甲基呋喃糖苷的 4-氨基和 5-氨基-2-三氟甲磺酸异构体混合物的分子内环闭合合成手性吡咯烷和哌啶的新方法。这种新方法可以从二丙酮葡萄糖中高效合成 1,4-二脱氧-1,4-亚氨基-D-阿拉伯糖醇(又称 DAB1)、(2S,3R,4R)-3,4-二羟基脯氨酸、法戈明[1,5-亚氨基-1,2、和(2S,3R,4R)-3,4-二羟基哌啶酸的分子内亲核置换。