Indazolinones, a new series of redox-active 5-lipoxygenase inhibitors with built-in selectivity and oral activity
作者:P. Bruneau、C. Delvare、M. P. Edwards、R. M. McMillan
DOI:10.1021/jm00107a023
日期:1991.3
Since the hypothetical mechanisms of hydroperoxydation of arachidonic acid by, respectively, 5-lipoxygenase (5-LPO) and cyclooxygenase (CO) involve a redox cycle, a compound which reduces 5-LPO and CO to their inactive state would give a nonselective inhibitor of both enzymes. Structural modifications of such a compound could be expected to give improved potency and selectivity for 5-LPO and oral activity. Such an approach has led to the discovery of 1,2-dihydroindazol-3-ones which are potent 5-LPO inhibitors with various degrees of selectivity. Structure-activity relationship studies indicated that while N-1,N-2-unsubstituted and N-1-substituted derivatives are orally inactive, N-2-alkyl derivatives are orally active and inhibit both 5-LPO and CO. In contrast, N-2-benzyl derivatives are selective for 5-LPO but possess only weak oral activity. Further structural modifications have identified ICI 207968 [1,2-dihydro-2-(3-pyridylmethyl)-3H-indazol-3-one, 21a] which combines potent oral activity and high selectivity. Methemoglobin (MHb) induction by 21a in dog blood precluded its development for clinical use. Attempts at dissociating 5-LPO inhibitory properties and MHb formation showed that MHb formation in vitro seemed to be related to the redox potential of the compounds whereas 5-LPO inhibition was not. This study led to a series of 4-(N-n-pentylcarbamoyl)indazolinones which maintained in vitro 5-LPO potency but did not induce MHb.
BRUNEAU, P.;DELVARE, C.;EDWARDS, M. P.;MCMILLAN, R. M., J. MED. CHEM. , 34,(1991) N, C. 1028-1036
作者:BRUNEAU, P.、DELVARE, C.、EDWARDS, M. P.、MCMILLAN, R. M.
DOI:——
日期:——
BAIOCCHI L.; PICCONI G., TETRAHEDRON LETT., 27,(1986) N 43, 5255-5256
作者:BAIOCCHI L.、 PICCONI G.
DOI:——
日期:——
On the isomerization of dialkyl indazolones to dihydro quinazolinones
作者:Leandro Baiocchi、Giuseppe Picccni
DOI:10.1016/s0040-4039(00)85183-7
日期:1986.1
Milrath, Monatshefte fur Chemie, 1908, vol. 29, p. 915