CN100366614C - 具有cb1-拮抗活性的4,5-二氢-1h-吡唑衍生物 - Google Patents
具有cb1-拮抗活性的4,5-二氢-1h-吡唑衍生物 Download PDFInfo
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Abstract
本发明是有关于一种在4,5-二氢吡唑环的第4位置具有S构型之新颖4,5-二氢-1H-吡唑衍生物,其为大麻CB1-受体的强效拮抗剂。此化合物具有下列通式(I)其中-R和R1可为相同或不同且代表3-吡啶基或4-吡啶基、或可经卤素或甲氧基取代之苯基,-R2和R3可为相同或不同且代表氢、烷基(1-3C)或二甲胺基,-R4代表可经1或2个选自卤原子、三氟甲基、甲氧基及烷基(1-3C)所成组群之取代基取代之苯基,及其互变体、前体药物和盐。该对映体比另一对映体为更强效且更具选择性之大麻CB1-受体的拮抗剂。
Description
本发明系有关于一种在4,5-二氢吡唑环的第4位置具有S构型之4,5-二氢-1H-吡唑衍生物的新颖对映体及有关制备该等化合物之方法,及含有一或多种此化合物作为活性成份之医药组合物。
上述(4S)-4,5-二氢-1H-吡唑为强效大麻-1(CB1)受体拮抗剂,具有治疗精神病学及神经病学疾病之利用性。
类大麻(cannabinoids)存在於印度大麻(Cannabis Sativa L.),并使用作为药用剂已有数世纪之久(Mechoulam,R.;Feigenbaum,J.J.Prog.Med.Chem.1987,24,159)。然而仅在过去数十年中,类大麻领域之研究揭露类大麻受体和其(内生的)促效剂和拮抗剂的重要资讯。该发现和随后选殖两种不同亚型的类大麻受体(CB1和CB2),激发了新颖类大麻受体拮抗剂之研究(Munro,S.;Thomas,K.L.;Abu-Shaar,M.Nature 1993,365,61.Matsuda,L.A.;Bonner,T.I.Cannabinoid Receptors,Pertwee,R.G.编辑1995,117,伦敦学院出版社)。另外,制药公司开始有兴趣发展类大麻药物,作为治疗类大麻系统失调相关的疾病。脑中广泛分布之CB1受体组合以极末梢定值之CB2受体,使CB1受体成为精神及神经疾病两者领域中极受注目之CNS-导向药物发现之分子标的(Consroe,P.Neurobiology ofDisease 1998,5,534.Pop,E,Curr.Opin.In CPNS Investigatiga-tional Drugs 1999,1,587.Greenberg,D.A.Drug News Perspect.1999,12,458.)。迄今,已知有三种不同的CB1受体体抗剂。Sanofi揭露基二芳基吡唑同质物作为选择性CB1受体拮抗剂。代表性实例为SR-141716A,其目前进行精神病学的II其临床研究(Dutta,A.K.;Sard,H.;Ryan,W.;Razdan,R.K.;Compton,D.R.;Martin,B.R.Med.Chem.Res.1994,5,54.Lan,R.;Liu,Q.;Fan,p.;Lin,S.;Fernando,S.R.;McCallion,D.;Pertwee,R.;Makriyannis,A.J.Med.Chem.1999,42,769.Nakamura-Palacios,E.M.;Moerschbaecher,J.M.;Barker,L.A.CNS Drug Rev.1999,5,43)。胺烷基吲哚已揭示可作为CB1受体拮抗剂。代表性实例为在1995年介纽之碘普瓦多啉(Iodopravadoline)(AM-630).AM-630为CB1受体拮抗剂,但有时呈现弱的部份促效剂(Hosohata,K.;Quock,R.M.;Hosohata,Y.;Burkey,T.H.;Makriyannis,A.;Consroe,P.;Roeske,W.R.;Yamamura,H.I.Life Sc.1997,61,PL115)。更最近之研究员提出芳基-芳酰基取代之苯并呋喃为选择性CB1受体拮抗剂(如LY-320135)(Felder,C.C.;Joyce,K.E.;Briley,E.J.;Glass,M.;Mackie,K.P.;Fahey,K.J.Cullinan,G.J.;Hunden D.C.;Johnson,D.W.;Chaney,M.O.;Koppel,G.A.;Brownstein,M.J.Pharmacol.Exp.Ther.1998,284,291)。最近,提出3-烷基-5,5’-二苯基咪唑啶二酮为类大麻受体配位体,其预示为类大麻拮抗剂(Kanyonyo,M.;Govaerts,S.J.;Hermans,E.;Poupaert,J.H.;Lambert,D.M.Biorg.Med.Chem.Lett.1999,9,2233)有趣的是许多CB1受体拮抗剂已被报道为活体外之反促效剂(Landsman,R.S.;Burkey,T.H.;Consroe,P.;Roeske,W.R.;Yamamura,,H.I.Eur.J.Pharmacol.1997,334,R1)。最近的回顾提供类大麻研究。领域现阶段状况之良好综述(Mechoulam,R.;Hanus,L.;Fride,E.Prog.Med.Chem.1998,35,199.Lambert,D.M. Curr. Med. Chem.1999,6,635.Mechoulam,R.;Fride,E.;Di Marzo.V. Eur.J.Pharmacol.1998,359,1)。
目前,意外地发现在其下式(1)的4,5-二氢吡唑环的第4位置具有S构型之4,5-二氢-1H-吡唑衍生物的新颖对映体,其前体药物、互变体及盐比对应之R-对映体为更具强效及选择性之大麻CB1-受体之拮抗剂;
其中
-R和R1可为相同或不同且代表相同或不同且代表3-吡啶基或4-吡啶基,或可经卤素或甲氧基取代之苯基,
-R2和R3可为相同或不同且代表氢可为相同或不同且代表氢、烷基(1-3C)或二甲胺基,
-R4代表可经1,2或3个选自卤原子、三氟甲基、甲氧基及烷基(1-3C)所成组群之取代基取代之苯基,
及其互变体、前体药物及盐。
本发明化合物由于具有强效CB1拮抗活性而适用于治疗精神疾病如精神病、焦虑、抑郁、注意力不足、记意疾病及食欲疾病、肥胖症,神经疾病如痴呆、双口畸形、帕金森氏症、阿尔茨海默症、癫痫病、亨丁顿氏舞蹈病、杜莱德氏病、脑缺血,以及用以治疗疼痛疾病和其他涉及类大麻神经传达之CNS-疾病,及治疗胃肠疾病及心血管疾病。
本发明化合物对类大麻CB1受体之亲和性系利用中国苍鼠卵巢(CHO)细胞的膜制剂测定,其中人类大麻CB1受体以[3H]CP-55,940作为放射配位体稳定地转染。添加或未添加本发明化合物以[3H]-配位体培育新制作之细胞膜制剂后,利用玻璃纤维滤纸过滤分离结合及游离之配位体。利用液体闪烁计数测定滤液上之放射活性。
本发明化合物之类大麻CB1拮抗活性系利用CHO细胞之功能研究加以测定,其中人类类大麻CB1受体已稳定表现。使用forskolin刺激腺酰基环酶及利用定量积之还状AMP量而测定。在浓度依存方法中,因CB1受受体促放剂(如CP-55,940)或(R)-WIN-55,212-2)活化CB1受体,可减弱forskolin-诱发之cAMP累积。此CB1受体调节之反应可藉CB1受体拮抗剂如本发明化合物拮抗。
本发明有关式(I)化合物E-异构物、Z-异构物及E/Z混合物。
该化合物可利用一般制程,使用辅助物质液体或固体载体物质制成适于投药之剂型。
具有式(III)之本发明化合物(参见如下)可依据例如a)EP0021506;b)DE 2529689之知方法获得。
本发明消旋化合物之适当合成如下:
合成路径A
路径A之步骤1
式(III)化合物:
与式(IV)化合物或其适当盐在碱存在下反应:
其中R5代表低级烷基,例如2-甲基-2-硫代假脲。此反应获得式(V)之4,5-二氢-1H-吡唑-1-甲脒衍生物:
其中各符号如上述定义。其中R、R1、R2及R3具有化合物(I)定义之式(V)化合物为新颖。
或者,式(III)化合物与所谓脒化剂反应。脒化剂实例为1H-吡唑-1-甲脒及其盐(例如盐酸盐),和3,5-二甲基-1H-吡唑-1-甲脒衍生物及其盐(例如硝酸盐)等。该反应得出式(V)的甲脒衍生物。
或者,式(III)化合物与所谓经保护之脒化剂反应。经保护脒化剂实例为N-(苄氧基羰基)-1H-吡唑-1-甲脒、N-(叔-丁氧基羰基)-1H-吡唑-1-甲脒和N,N′-双(叔-丁氧基羰基)-1H-吡唑-1-甲脒等。
此反应去保护后获得式(V)化合物。
路径A之步聚2
式(V)化合物与式R4-SO2X之选择性取代之化合物反应,其中R4如前述定义及X代表卤原子。此反应较好在碱如三乙胺存在下于非质子性溶液如乙腈中进行。
合成路径A1
路径A1之步骤1
式(III)化合物:
与式(VI)之硫代异氰酸酯衍生物反应:
此反应较好在惰性有机溶液如乙腈中进行。
此反应获得式(VII)之硫代甲酰胺衍生物,其中R、R1及R4具有化合物(I)定义之式(VII)合物为新颖。
路径A1之步骤2
式(VII)化合物与胺在汞(II)监例如HgCl2存在下反应,得到式(I)化合物。
此反应较好在极性有机溶液中例如乙腈中进行。
合成路径A2
路径A2之步骤1
式(III)之化合物:
与式(VIII)之胺基甲酸酯衍生物反应:
其中R6代表低级烷基,例如甲基。
此反应较好于惰性有机溶液如1,4-二氧杂环己烷中进行。
此反应得到式(IX)之4,5-二氢吡唑-1-甲酰胺衍生物。其中R、R1和R4具有化合物(I)所述定义之式(IX)化合物为新颖。
路径A2之步骤2
式(IX)化合物于卤化剂例如PCl5反应,得到式(X)之4,5-二氢吡唑-1-甲酰亚胺酰基卤化物(carboximidoyl halogenide)衍生物:
其中R7代表卤原子,例如氯。上反应较好于惰性有机溶液例如氯苯中进行。
其中R、R1和R4如化合物(I)之定义及R7代表卤原子之式(X)化合物为新颖。
路径A2之步骤3
式(X)化合物与胺反应,得到式(I)化合物。
此反应较好惰性有机溶液如二氯甲烷中进行。
合成路径A3
路径A3之步骤1
式(III)化合物:
与式(XI)之二硫代亚胺碳酸酯衍生物反应:
其中R8代表C1-3烷基。
此反应较好与极性有机溶液如乙腈中进行。
此反应得到式(XII)之甲酰亚胺硫代酸酯。
其中R、R1和R4具有化合物(I)定义且其中R8代表C1-3烷基之式(XII)化合物为新颖。
路径A3之步骤2
式(XII)化合物与胺反应得到式(I)化合物。
此反应较好于极性有机溶液如甲醇中进行。
实施例I
3-(4-氯苯基)-4,5-二氢-N-((4-氟苯基)磺酰基)-4-苯基-1H-吡唑-1-甲脒
A部份:3-(4-氯苯基)-4,5-二氢-4-苯基-1H-吡唑(5.13克,20.0毫摩尔)、2-甲基-2-硫代假脲氢碘盐(5.00克,23.0毫摩尔)及吡啶(10毫升)之搅拌混合在110℃加热1小时。室温置放隔夜后,添加二乙基醚,利用过滤法收集沉淀物。沉淀物以二乙基醚清洗三次得到固体(9克),熔点:~230℃。此固体物溶于甲醇(20毫升)中。
依序添加2N氢氧化钠溶液(12毫升)和水(200毫升)至所得溶液中。利用过滤法收集沉淀物,以二乙基醚清洗二次及随后以二丙基醚清洗。所得固体加经真空干燥得到3-(4-氯苯基)-4,5-二氢-4-苯基-1H-吡唑-1甲脒(5.1克,产率88%),熔点:187-189℃。
B部分:3-(4-氯苯基)-4,5-二氢-4-苯基-1H-吡唑-1-甲脒(0.50克,1.68毫摩尔)及4-氟苯基磺酰氯(0.34克,1.75毫摩尔)之乙腈(10毫升)搅拌混合物中,添加N,N-二甲基-4-胺基吡啶(0.020克,0.175毫摩尔)及三乙胺(1毫升)。所得溶液于室温搅拌30分钟。添加2N氢氧化钠溶液及以乙酸乙酯(400毫升)萃取后,真空浓缩乙酸乙酯层。所得粗残留物进一步用快速层析法(石油醚/二乙基醚=1/1(v/v),接著乙酸乙酯)方式纯化。接着真空浓缩得到固体3-(4-氯苯基)-4,5-二氢-N-((4-氟苯基)磺酰基)-4-苯基-1H-吡唑-1-甲脒(0.55克,产率72%),熔点:214-215℃。
依类似方式制作下列之式(I)化合物:
4,5-二氢-N-((4-氟苯基)磺酰基)-3-(4-甲氧苯基)-4-(4-甲氧基苯基)-1H-吡唑-1-甲脒,熔点155-156℃。
4,5-二氢-3-(4-甲氧基苯基)-4-(4-甲氧苯基)-N-((4-甲氧基苯基)磺酰基)-1H-吡唑-1-甲脒,熔点148-150℃。
3-(4-氯苯基)-4,5-二氢-4-苯基-N-((2,4,6-三甲基苯基)磺酰基)-1H-吡唑-1-甲脒,熔点221-222℃。
实例II
N1,N1-二甲基-N2-((4-氯苯基)磺酰基)-3-(4-氯苯基)-4,5-二氢-4-苯基-1H-吡唑-1-甲脒
A部份:3-(4-氯苯基)-4,5-二氢-4-苯基-1H-吡唑(12.0克,46.8毫摩尔)、[(4-氯苯基)磺酰基]二硫代亚胺碳酸二甲酯(CAS:13068-12-7)(9.20克,31.1毫摩尔)、及三乙基胺(15毫升)之乙腈(200毫升)搅拌混合回流加热20小时。再添加3-(4-氯苯基)-4,5-二氢-4-苯基-1H-吡唑(12.0克,46.8毫摩尔),及所得混合物再回流加热16小时。真空浓缩后,加入二氯甲烷,所得溶液以水清洗二次,以无水Na2SO4脱水。过滤和真空蒸发后,残留物进一步利用快速层析法(二乙基醚/石油醚=1/1(v/v))纯化,得到非晶形固体之3-(4-氯苯基)-N-((4-氯苯基)磺酰基)-4,5-二氢-4-苯基-1H-吡唑-1-甲酰亚胺基硫代酸甲酯(12.5克以[(4-氯苯基)磺酰基]二硫代亚胺碳酸二甲酯计,产率80%)。
B部份:于3-(4-氯苯基)-N-((4-氯苯基)磺酰基)-4,5-二氯-4-苯基-1H-吡唑-1-甲酰亚胺基硫代酸甲酯(4.20克,8.30毫摩尔之甲醇(75毫升),搅拌混合物中,添加二甲基胺(10毫升)及二氯甲烷(75毫升),所得溶液于室温搅拌6小时。真空蒸发及接著进行快速层析(二乙基醚/石油醚=1/1(v/v),接著二乙基醚)纯化,得到固体,其进一步自二异丙基醚再结晶纯化,得到N1-二甲基-N2-((4-(氯苯基)磺酰基)-3-(4-氯苯基)-4,5-二氢-4-苯基-1H-吡唑-1-甲脒(2.63克,63%)产率),熔点:182℃。
依类似方法,制作下列式(I)化合物:
N-甲基-N’-((4-氯苯基)磺酰基)-3-(4-氯苯基)-4,5-二氢-4-(3-吡啶基)-1H-吡唑-1-甲脒,熔点:101-105℃。
N-甲基-N’-((4-氯苯基)磺酰基)-3-(4-氯苯基)-4,5-二氢-4-(4-吡啶基)-1H-吡唑-1-甲脒,熔点:112-115℃。
实例III
N-甲基-N’-((4-氯苯基)磺酰基)-3-(4-氯苯基)-4,5-二氢-4-苯基-1H-吡唑-1-甲脒
A部分:N-((4-氯苯基)磺酰基胺基甲酸甲酯(CAS:34543-04-9)(2.99克,12.0毫摩尔)及吡啶(4毫升)之1,4-二氧杂环己烷(20毫升)溶液中,添加3-(4-氯苯基)-4,5-二氢-4-苯基-1H-吡唑(3.39克,13.2毫摩尔),所得混合溶液在100℃搅拌4小时。真空浓缩后,残留物溶于二氯甲烷中,再依序用水、1N HCl和水清洗,以无水Na2SO4脱水,过滤及真空缩体只成为20毫升。添加甲基-叔-丁基醚(60毫升)及所得溶液浓缩体积成为20毫升。过滤收集所形成之结晶及自甲基-叔-丁基醚再结晶,得到3-(4-氯苯基)-N-((4-氯苯基)磺酰基)-4,5-二氢-4-苯基-1H-吡唑-1-甲脒(4.75克,76%产率),熔点:211-214℃。
B部份:3-(4-氯苯基)-N-((4-氯苯基)磺酰基)-4,5-二氢-4-苯基-1H-吡唑-1-甲脒(3.67克,7.75毫摩尔)及五氯化磷(1.69克,8.14毫摩尔)之氯苯(40毫升)摩尔)混合加热回流1小时。真空浓缩后,所形成之N-((4-氯苯基)磺酰基)-3-(4-氯苯基)-4,5-二氢-4-苯基-1H-吡唑-1-甲亚酰胺基氯悬浮于二氯甲烷中,并于冷却甲基胺(1.5毫升)反应。在室温搅拌1小时后,混合物真空浓缩。残留物自二乙基醚结晶,得到N-甲基-N’-((4-氯苯基磺酰基)-3-(4-氯苯基)-4,5-二氢-4-苯基-1H-吡唑-1-甲脒(2.29克,61%产率),熔点:96-98℃。
依类似方式制作下列式(1)化合物:
N-甲基-N’-((3-氯苯基)磺酰基)-3-(4-氯苯基)-4,5-二氢-4-苯基-1H-吡唑-1-甲脒,熔点:156-160℃。
N-丙基-N’-((4-氟苯基)磺酰基)-3-(4-吡啶基)-4,5-二氢-4-苯基-1H-吡唑-1-甲脒,熔点:129-138℃。
N-(2-丙基)-N’-((4-氟苯基)磺酰基)-3-(4-氯苯基)-4,5-二氢-4-苯基-1H-吡唑-1-甲脒,熔点:110-112℃。
N-(2-丙基)-N’-((4-氯苯基)磺酰基)-3-(4-吡啶基)-4,5-二氢-4-苯基-1H-吡唑-1-甲脒,熔点:非晶型。
N1-乙基-N1-甲基-N2-((4-氯苯基)磺酰基)-3-(4-氯苯基)-4,5-二氢-4-苯基-1H-吡唑-1-甲脒,熔点:184℃。
N1-乙基-N1-甲基-N2-((4-氯苯基)磺酰基)-3-(4-氯苯基)-4,5-二氢-4-苯基-1H-吡唑-1-甲脒,熔点:173-176℃。
N1,N1-二甲基-N2-((4-三氟甲基)苯基)磺酰基)-3-(4-氯苯基)-4,5-二氢-4-苯基-1H-吡唑-1-甲脒,熔点:195-196℃。
N1,N1-二甲基-N2-((3-甲基苯基)磺酰盐)-3-(4-氯苯基)-4,5-二氢-4-苯基-1H-吡唑-1-甲脒,熔点:195-198℃。
N1,N1-二甲基-N2-((3-甲氧基苯基)磺酰盐)-3-(4-氯苯基)-4,5-二氢-4-苯基-1H-吡唑-1-甲脒,熔点:204-206℃。
N-乙基-N1-((4氯苯基)磺酰基)-3-(4-氯苯基)-4,5-二氢-4-苯基-1H-吡唑-1-甲脒,熔点:非晶型。
N-二甲胺基-N1-((4-氯苯基)磺酰基)-3-(4氯苯基)-4,5-二氢-4-苯基-1H-吡唑-1-甲脒,熔点:155-159℃。
N-甲基-N1-((4-三氟甲基)苯基)磺酰基)-3-(4-氯苯基)-4,5-二氢-4-苯基-1H吡唑-1-羧脒,熔点:非晶型。
N1,N1-二甲基-N2-((2-甲基苯基)磺酰基)-3-(4-氯苯基)-4,5-二氢-4-苯基-1H-吡唑-1-甲脒,熔点:148-151℃。
N-甲基-N’-((2,4-二氟苯基)磺酰基)-3-(4-氯苯基)-4,5-二氢-4-苯基-1H-吡唑-1-甲脒,熔点:85℃。
实例IV
(-)-(4S)-N-甲基-N’-((4-氯苯基)磺酰基)-3-(4-氯苯基)-4,5-二氢-4-苯基-1H-吡唑-1-甲脒
使用Chiralpak AD,20微米手性固定相,分离消旋N-甲基N’-((4-氯苯基)磺酰基)-3-(4-氯苯基)-4,5-二氢苯基-4-苯基-1H-吡唑-1-甲脒(18克,0.037摩尔),得到(-)-(4S)-N-((4-氯苯基)磺酰基)-3-(4-氯苯基)-4,5-二氢-4-苯基-1H-吡唑-1-甲脒(7.16克,0.0147摩尔)([α25 D]=-150°,c=0.01,MeOH)(熔点:169-170℃。移动相由己烷/乙醇(80/20(v/v)及0.1%氢氧化铵(25%水溶液)之混合所构成。
依类似方式自对应消旋物制作下列光学纯化合物:
(-)-(4S)-N-乙基-N’-((4-氯苯基)磺酰基)-3-(4-氯苯基)-4,5-二氢-4-苯基-1H-吡唑-1-甲脒:([α25 D]=-126°,c=0.01,CHCl3),熔点:172-175℃,固定相:Chiralcel OD。移动相;庚烷/2-丙醇(85/15(v/v))混合溶液。
(-)-(4S)-N-二甲胺基-N’-((4-氯苯基)磺酰基)-3-(4氯苯基)-4,5-二氢-4-苯基-1H-吡唑-1-甲脒:([α25 D]=-132°,c=0.01,CHCl3,熔点218-224℃,固定相:Chiralcel OD。移动相:庚烷/2-丙醇(85/15(v/v))混合溶液。
(-)-(4S)-N-甲基-N’-((4-三氟甲基)苯基)磺酰基)-3-(4-氯苯基)-4,5二氢-4-苯基-1H-吡唑-1-甲脒;([α25 D]=-131°,c=0.01,CHCl3),熔点:157-160℃,固定相:Chiralcel OD。移动相:庚烷/2-丙醇(85/15(v/v))混合溶液。
(-)-(4S)-N1,N1-二甲基-N2-((2-甲基苯基)磺酰基)-3-(4-氯苯基)-4,5-二氢-4-苯基-1H-吡唑-1-甲脒:[α25 D]=-88°,c=0.01,MeOH),熔点:非晶型,固定相:Chiralpak AD。移动相:乙醇。
(-)-(4S)-N-甲基-N’-((2,4-二氟苯基)磺酰基)-3-(4-氯苯基)-4,5-二氯-4-苯基1H-吡唑-H-羧脒::[α25 D]=-129°,c=0.01,MeOH,熔点:非晶型,固定相:Chiralpak AD。移动相:甲醇。
Claims (8)
2.如权利要求1之式(I)化合物,其中R为4-氯苯基,R1为苯基,R2为氢,R3为甲基及R4为4-氯苯基;及基盐类。
3.一种医药组合物,含有如权利要求1之至少一种化合物作为活性成份。
4.一种制备医药组合物之方法,其特征在于使权利要求1之化合物制成适于给药之剂型。
5.一种制备权利要求1的式I化合物之方法,其特征在于使式I化合物的消旋混合物分离成左旋及右旋对映体。
6.权利要求1的化合物在制备治疗精神疾病的药物中的用途,其中该精神疾病选自精神病、焦虑、抑郁、注意力不足、记忆疾病及食欲疾病,肥胖症,选自帕金森氏症、痴呆、肌张力障碍、阿尔茨海默症、癫病、亨丁顿氏舞蹈病、杜莱德氏病、脑缺血、疼痛疾病的神经疾病和其他涉及类大麻神经传达之CNS-疾病。
7.权利要求1的化合物在制备治疗涉及类大麻神经传达之胃肠疾病的药物中的用途。
8.权利要求1的化合物在制备治疗涉及类大麻神经传达之心血管疾病的药物中的用途。
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