Synthesis of novel cyclobutylphosphonic acids as inhibitors of imidazole glycerol phosphate dehydratase
作者:Roger D. Norcross、Peter von Matt、Hartmuth C. Kolb、Daniel Belluš
DOI:10.1016/s0040-4020(97)00682-0
日期:1997.7
3-oxocyclobutylphosphonate (5) has been synthesised via a novel one-pot cyclisation reaction of the α-phenylsulphonyl-γ,δ-epoxyphosphonate 8. Addition of 5-lithio-1-trityl-1,2,4-triazole to ketone 5 and deprotection then afforded cis-3-hydroxy-3-(1,2,4-triazol-3-yl)cyclobutylphosphonic acid (cis-4) which showed modest in vitro inhibition of the enzyme imidazole glycerol phosphate dehydratase. In an attempt to obtain
二乙基3- oxocyclobutylphosphonate(5)已经经由α-苯磺酰-γ,δ-epoxyphosphonate的新颖一锅环化反应合成了8。在酮5中加入5-硫代-1-三苯甲基-1,2,4-三唑并脱保护,得到顺式-3-羟基-3-(1,2,4-三唑-3-基)环丁基膦酸(顺式- 4)显示对咪唑磷酸甘油甘油脱水酶的适度体外抑制。在试图获得相应的反式异构体(反式- 4),其抑制活性预计更高,开发了一种有效的三步合成方法,利用碱介导的γ,δ-环氧-γ-(1,2,4-三唑-5-基)膦酸酯的环化反应35。虽然这后一种途径立体选择性,得到顺式- 36,一个有效的差向异构化反应可随后用于获得所希望的反式立体化学。然而,在去保护所有企图反式- 36具有同时再差向异构继续给先前准备的顺式- 4。高水平的从头算已经被用来合理化热力学的相对稳定性。顺- 4和反式- 4。