申请人:Merck & Co., Inc.
公开号:US04443435A1
公开(公告)日:1984-04-17
Novel, transient prodrug forms of biologically active agents containing mercapto groups have (i) the structural formula (I): ##STR1## wherein X is O, S, or NR.sup.5 ; R.sup.1 S is the residue of any biologically active agent R.sup.1 SH; R.sup.2 is selected from the group consisting of straight or branched chain alkyl having from 1 to 20 carbon atoms; aryl having from 6 to 10 carbon atoms; cycloalkyl having from 3 to 8 carbon atoms; alkenyl having from 2 to 20 carbon atoms; cycloalkenyl having from 4 to 8 carbon atoms; alkynyl having from 2 to 20 carbon atoms; aralkyl, alkaryl, aralkenyl, aralkynyl, alkenylaryl, alkynylaryl, loweralkanoyloxyalkyl, carboxyalkyl, and lower alkanoyloxyalkyl wherein alkyl, aryl, alkenyl and alkynyl are as defined above; saturated or unsaturated monoheterocyclic or polyheterocyclic, or fused heterocyclic, either directly bonded to the carbonyl function or linked thereto via an alkylene bridge, containing from 1 to 3 of any one or more of the heteroatoms N, S or O in each heterocyclic ring thereof and each such ring being from 3- to 8- membered; and mono- or polysubstituted derivatives of the above, each of said substituents being selected from the group consisting of lower akyl, lower alkoxy, lower acyl, lower acyloxy, halo, haloloweralkyl, cyano, carbethoxy, loweralkylthio, amino, nitro, loweralkylamino, diloweralkylamino, carboxyl, carbamyl, loweralkylcarbamyl, diloweralkylcarbamyl and ##STR2## wherein R.sup.4 is hydrogen or alkyl having from 1 to 10 carbons; R.sup.3 is hydrogen, R.sup.2, lower acyl, cyano, haloloweralkyl, carbamyl, loweralkylcarbamyl, diloweralkylcarbamyl, --CH.sub.2 ONO.sub.2 and --CH.sub.2 OCOR.sup.2 ; R.sup.5 is hydrogen or lower alkyl; and further wherein R.sup.2 and R.sup.3 may be taken together to form a cyclizing moiety selected from the group consisting of ##STR3## with the proviso that when R.sup.1 S is the residue of a sulfur containing amino acid, then X cannot be NR.sup.5 ; (ii) the structural formula (I) wherein ##STR4## is the residue of any naturally occurring protein amino acid, the residue of any N-substituted naturally occurring amino acid, which N-substituent is lower alkyl or any amino acid protective group cleavable via hydrogenolysis or hydrolysis, or the residue of an N,N-lower dialkyl of C.sub.4 -C.sub.7 cycloalkylamino acid; and (iii) the non-toxic, pharmaceutically acceptable salts thereof.
含有巯基的生物活性剂的新型、短暂的前药形式具有以下结构式(I):
##STR1##
其中,X为O、S或NR.sup.5; R.sup.1 S为任何生物活性剂R.sup.1 SH的残基; R.sup.2选自以下组合:直链或支链烷基,其碳原子数为1到20;含有6到10个碳原子的芳基;含有3到8个碳原子的环烷基;含有2到20个碳原子的烯基;含有4到8个碳原子的环烯基;含有2到20个碳原子的炔基;aralkyl、alkaryl、aralkenyl、aralkynyl、alkenylaryl、alkynylaryl、loweralkanoyloxyalkyl、carboxyalkyl和lower alkanoyloxyalkyl,其中alkyl、aryl、烯基和炔基如上所定义;饱和或不饱和的单杂环或多杂环,或融合的杂环,直接与羰基功能键相结合或通过烷基桥连接到其中,每个杂环环中都包含1到3个任何一个或多个杂原子N、S或O,并且每个这样的环都是3到8个成员的;上述化合物的单取代或多取代衍生物,每个取代基选自以下组合:lower alkyl、lower alkoxy、lower acyl、lower acyloxy、halo、haloloweralkyl、cyano、carbethoxy、loweralkylthio、amino、nitro、loweralkylamino、diloweralkylamino、carboxyl、carbamyl、loweralkylcarbamyl、diloweralkylcarbamyl和
##STR2##
其中,R.sup.4为氢或具有1到10个碳的烷基;R.sup.3为氢、R.sup.2、lower acyl、cyano、haloloweralkyl、carbamyl、loweralkylcarbamyl、diloweralkylcarbamyl、--CH.sub.2 ONO.sub.2和--CH.sub.2 OCOR.sup.2;R.sup.5为氢或低碳烷基;进一步,R.sup.2和R.sup.3可以结合形成选自以下组合的环化基团:
##STR3##
但是,当R.sup.1 S是含硫氨基酸的残基时,X不能是NR.sup.5;(ii)结构式(I)其中
##STR4##
为任何天然存在的蛋白质氨基酸的残基,任何N-取代的天然存在的氨基酸的残基,其N-取代基为低碳烷基或可以通过氢解或水解脱离的任何氨基酸保护基,或C.sub.4-C.sub.7环烷基氨基酸的N,N-低二烷基的残基;(iii)其非毒性的、药学上可接受的盐。