(20aβ). The Na salt of crude 1 is usually contaminated with 2,4-diformyl-3-(2,2-dimethoxyethyl)glutaraldehyde (9) and 2,4-diformyl-3-methylglutaraldehyde (10), so that, in its reactions with 2-amino-2-deoxy-d-glucose hydrochloride, 2-deoxy-2-[3,5-diformyl-4-(2,2-dimethoxyethyl)-1,4- dihydropyridin-1-yl]-a,β-d-glucopyranose (16) and 2-deoxy-2-(3,5-diformyl-4-methyl-1,4-dihydropyridin-1-yl)-a,β-d-glucopyranose
2-
氨基-2-脱氧-d-
葡萄糖酸盐与
丙二醛(7)和甲基
丙二醛(8)的钠盐反应,得到2-脱氧-2-[((3-氧代-1-丙-1-基)
氨基]
氨基] -a,β-d-
吡喃
葡萄糖(12)和2-脱氧-2-[((2-甲基-3-氧代-1-丙-1-基)
氨基] -a,β-d-
吡喃
葡萄糖(13) ,分别以高收成。同样,β-d-
吡喃
葡萄糖基胺得到3-(β-d-
吡喃
葡萄糖基
氨基)-2-
丙烯醛(14)和3-(β-d-
吡喃
葡萄糖基
氨基)-2-甲基-2-
丙烯醛(15)。2-
氨基-2-脱氧-β-d-
吡喃
葡萄糖和7在pH约9下反应,得到3-
吡咯甲醛(19),5-(d-
阿拉伯糖醇-四糖醇-1-基)-3-
吡咯甲醛的混合物( 21)和5-(a,β-d-
呋喃呋喃糖基)-3-
吡咯甲醛(20aβ)。粗制物1的Na盐通常被2,4-二甲酰基-3-(2,2-二甲氧基乙基)
戊二醛(9)和2,4-二甲酰基-
3-甲基戊二醛(10)污染,因此,在与2-