申请人:Monsanto Company
公开号:US05013842A1
公开(公告)日:1991-05-07
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的方法,通过甲基呋喃糖苷的4-氨基和5-氨基-2-三氟甲磺酸酯的异构混合物的分子内环合反应,合成手性吡咯烷和哌嗪烷。该新方法首选从二乙酰葡萄糖高效合成1,4-二去氧-1,4-亚氨基-D-阿拉伯糖醇(DAB1),(2S,3R,4R)-3,4-二羟基脯氨酸,法戈米因[1,5-亚氨基-1,2,5-三去氧-D-阿拉伯糖醇]和(2S,3R,4R)-3,4-二羟基哌嗪酸,通过分子内核苷酸亲核取代,利用2-O-三氟甲磺酸酯的异构混合物的氨基功能。