Process for preparing 8-cyclopentyl-6-ethyl-3-[substituted]-5,8-dihydro-4H-1,2,3a,7,8-pentaaza-as-indacenes and intermediates useful therein
申请人:Pfizer Inc.
公开号:US06326495B2
公开(公告)日:2001-12-04
The invention concerns a method of preparing an 8-cyclopentyl-6-ethyl-3-[substituted]-5,8-dihydro-4H-1,2,3a,7,8-pentaaza-as-indacene compound of the formula:
and pharmaceutically acceptable salt forms thereof, where R1 is hydrogen; alkyl; alkoxy; alkoxyalkyl; alkenyl; cycloalkyl; cycloalkylalkyl; a saturated or unsaturated heterocyclic-(CH2)n—group; or a group of the formula —(Y)b—(Z)c-phenyl-(R5)a; comprising: (a) subjecting a solventless reaction mixture of &ggr;-caprolactone and p-methoxybenzylamine to heating whereby there is produced an amide compound N-protected by p-methoxybenzyl; (b) reducing said amide compound whereby there is produced an amino alcohol compound N-protected by p-methoxybenzyl; (c) acylating said aminoalcohol compound with ethyl oxalyl chloride whereby there is produced an oxalamic acid ethyl ester compound N-protected by p-methoxybenzyl; (d) oxidizing said oxalamic acid ethyl ester compound whereby there is produced an oxalamide ketone compound N-protected by p-methoxybenzyl, of the formula:
(e) ring closing said oxalamide ketone compound whereby there is produced a pyridinone compound N-protected by p-methoxybenzyl, of the formula:
(f) O-methylating said pyridinone compound whereby there is produced a 3-methoxy-pyridinone compound N-protected by p-methoxybenzyl; (g) treating said 3-methoxy-pyridinone compound with cyclopentylhydrazine, whereby there is produced a pyrazolopyridinone compound N-protected by p-methoxybenzyl; (h) deprotecting said pyrazolopyridinone compound by removing said p-methoxybenzyl group therefrom, whereby there is produced a lactam compound of the formula:
(i) esterifying said lactam compound whereby there is produced a corresponding imino ester (imidate) compound of the formula:
and (j) treating said imino ester (imidate) compound with a carboxylic hydrazide compound of the formula: R1—C(═O)—NH—NH2, where R1 has the same meaning as set out further above; whereby there is produced said 8-cyclopentyl-6-ethyl-3-[substituted]-5,8-dihydro-4H-1,2,3a,7,8-pentaaza-as-indacene.
本发明涉及一种制备8-环戊基-6-乙基-3-[取代]-5,8-二氢-4H-1,2,3a,7,8-五氮杂萘化合物及其药学上可接受的盐形式的方法,其中R1为氢; 烷基; 烷氧基; 烷氧基烷基; 烯基; 环烷基; 环烷基烷基; 饱和或不饱和的杂环-(CH2)n-基团; 或式为-(Y)b-(Z)c-苯基-(R5)a的基团; 包括:(a)将&ggr;-己内酯和对甲氧基苯甲胺的无溶剂反应混合物加热,从而产生一种受对甲氧基苯甲基保护的酰胺化合物; (b)还原所述酰胺化合物,从而产生一种受对甲氧基苯甲基保护的氨基醇化合物; (c)用草酰氯乙酯酰化所述氨基醇化合物,从而产生一种受对甲氧基苯甲基保护的草酰胺乙酯化合物; (d)氧化所述草酰胺乙酯化合物,从而产生一种受对甲氧基苯甲基保护的草酰胺酮化合物,其式为:(e)环合所述草酰胺酮化合物,从而产生一种受对甲氧基苯甲基保护的吡啶酮化合物,其式为:(f)用甲基碘化物甲基化所述吡啶酮化合物,从而产生一种受对甲氧基苯甲基保护的3-甲氧基吡啶酮化合物; (g)用环戊基肼处理所述3-甲氧基吡啶酮化合物,从而产生一种受对甲氧基苯甲基保护的吡唑吡啶酮化合物; (h)去除所述吡唑吡啶酮化合物中的p-甲氧基苯甲基团,从而去保护,产生一种内酰胺化合物,其式为:(i)酯化所述内酰胺化合物,从而产生一种相应的亚胺酯(亚胺)化合物,其式为:(j)用式为R1-C(═O)-NH-NH2的羧酸肼化合物处理所述亚胺酯(亚胺)化合物,其中R1具有上述相同的含义; 从而产生所述8-环戊基-6-乙基-3-[取代]-5,8-二氢-4H-1,2,3a,7,8-五氮杂萘化合物。