Synthesis and Enzymatic Evaluation of Substrates and Inhibitors of ?-Glucuronidases
作者:Roland Hoos、Jiang Huixin、Andrea Vasella、Patrick Weiss
DOI:10.1002/hlca.19960790703
日期:1996.10.30
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