Two new routes to substituted aminotetrahydrofuran derivatives have been investigated. Treatment of 3,6-dihydro-2H-1,2-oxazines with hydrochloric acid in the presence of zinc provided 4-benzylamino-5-hydroxy furanose derivatives which contain a quaternary anomeric centre with a vinyl unit. Upon mesylation and subsequent heating in aqueous media 5-hydroxy-3,4,5,6-tetrahydro-1,2-oxazines were converted into novel bicyclic 1,2-oxazines with complete regio- and stereoselectivity. Cleavage of the N-O bond and subsequent debenzylation furnished enantiopure polyhydroxylated aminotetrahydrofuran derivatives which are promising ligands for selectin inhibition studies.
                                    我们研究了两种获得取代
氨基
四氢呋喃衍
生物的新途径。在
锌存在下,用
盐酸处理 3,6-二氢-2H-1,2-噁嗪,可得到 4-苄基
氨基-5-羟基
呋喃糖衍
生物。在
水介质中,5-羟基-3,4,5,6-四氢-1,2-噁嗪经甲基化并随后加热后,以完全的区域和立体选择性转化为新型双环 1,2-噁嗪。N-O 键的裂解和随后的去苄基化反应生成了对映体纯的多羟基
氨基
四氢呋喃衍
生物,这些衍
生物是很有希望用于选择素抑制研究的
配体。