4-methylumbelliferyl β-D-glucuronide (=(4-methyl-2-oxo-2H-1-benzopyran-7-yl β-D-glucopyranosid)uronic acid; 6) were synthesized and evaluated as substrates of β-glucuronidases. Similarly, the phenylcarbamate 7 and its phosphono analogue 8 were prepared and evaluated as inhibitors. To examine the diastereoselectivity of the phosphorylation, we also synthesized the protected L-ido-D-gluco-, and D-galacto-configurated
4-甲基伞形基β-
D-葡糖醛酸(=(4-甲基-2-氧代-2 H -1-苯并
吡喃-7-基β-D-
吡喃
葡糖苷)糖醛酸的膦酰基和
四唑基类似物4和5 ; 6)合成并评估为β-
葡萄糖醛酸苷酶的底物。类似地,制备
氨基甲酸苯酯7及其膦酰基类似物8,并将其评估为
抑制剂。为了检查
磷酸化的非对映选择性,我们还合成受保护的L-
IDO -
D-葡糖- ,和
D-半乳-构型
磷glycopyranuronates 12,图13,21,22,34和35。遵循了两种策略。在第一个中,将
葡糖醛酸19脱羧至11,并通过20进一步转化成三
氯乙亚
氨酸酯10(方案2)。用(MeO)3 P
磷酸化10生成非对映异构体12和13,其非对映选择性取决于溶剂。在MeCN中,以1:1的比例获得12和13,而在非参与溶剂中,L-
IDO 12是主要的非对映异构体。
乙酸盐11对(MeO)是惰性的3 P,但与(PhO)3 P反应生成异头混合物21/22,同时在中间体the盐中保持稳定的1