The 16,17-Double Bond Is Needed for Irreversible Inhibition of Human Cytochrome P450<sub>17</sub><sub>α</sub> by Abiraterone (17-(3-Pyridyl)androsta-5,16-dien-3β-ol) and Related Steroidal Inhibitors
作者:Michael Jarman、S. Elaine Barrie、Jose M. Llera
DOI:10.1021/jm981017j
日期:1998.12.1
drost-5-en-3beta-ol (5) and 17beta-(3-pyridyl)-16,17alpha-epoxy-5alpha-androst-3beta-ol (6) were synthesized. 3beta-Acetoxyetienic acid was converted in three steps into 5 via photolysis of the thiohydroxamic ester 8. Oxidation of an appropriate 16,17-unsaturated precursor (21) with CrO3-pyridine afforded the acetate (23) of 6. Inhibition of the enzyme by 1, the similarly potent 5,6-reduced analogue
阿比特龙(17-(3-吡啶基)androsta-5,16-dien-3beta-ol,1)是一种有效的抑制剂(对人细胞色素P45017alpha的IC50为4 nM羟化酶)。为了协助研究16,17-双键在其作用机理中的作用,新型17alpha-(4-吡啶基)androst-5-en-3beta-ol(5)和17beta-(3-吡啶基)合成了-16,17alpha-环氧-5alpha-androst-3beta-ol(6)。通过硫代异羟肟酸酯8的光解反应,可将3β-乙酰氧基烯酸分三步转化为5。适当的16,17-不饱和前体(21)用CrO3-吡啶氧化得到乙酸盐(23)。6 1,同样有效的5,6-还原类似物19(IC50 5 nM),4、16 dien-3-one 26(IC50 3 nM)和效价较低的(IC50 13 nM)3,5,16 -三烯25的发生较慢,但通过将抑制剂与酶预孵育而增强。与