CN104592276A - 三芳基硼类荧光化合物及其制备方法和用途 - Google Patents
三芳基硼类荧光化合物及其制备方法和用途 Download PDFInfo
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Abstract
本发明公开了一系列三芳基硼化合物及基于该类化合物的纳米水凝胶荧光巯基探针。该化合物对巯基化合物有很好的选择性,可用作巯基化合物的荧光探针,可在有机溶液或有机-水混合溶液中检测巯基化合物。基于该类化合物的纳米水凝胶荧光探针,可在水溶液或缓冲溶液中检测巯基化合物,并可自主进入细胞中,用于细胞内巯基化合物单光子或双光子荧光成像。本发明的荧光探针具有灵敏度高、响应速度快、专一性好、生物毒性低、响应范围宽等优点。
Description
技术领域
本发明涉及一系列三芳基硼化合物及含有该化合物的纳米水凝胶探针的制备和使用方法。该探针可用于巯基化合物的荧光检测,特别是活细胞内巯基化合物的检测。
背景技术
巯基化合物在包括细胞内氧化还原、异生物质代谢、细胞内信号传递、基因调节等许多生理过程中起重要作用。生物体内巯基化合物的含量异常与诸多疾病相关,如癌症、早老性痴呆症、心血管疾病、神经管缺陷、炎性肠病、骨质疏松症等。因此,对巯基化合物的检测具有重要的意义。
目前检测巯基化合物的方法包括高效液相色谱法、毛细管电泳法、比色检测法、荧光检测法等。其中荧光检测法具有灵敏度高、特异性强、响应速度快、可实时监测等优点,引起广泛关注。带有电子给体的三芳基硼化合物具有分子内电荷转移性质,展现出较强的环境响应性和较大的双光子吸收截面,是一种性能优异的荧光染料。
发明内容
本发明的目的在于提供一类能够用于检测巯基化合物的荧光化合物及其制备方法。
本发明的另一目的在于提供由这一荧光化合物所制备的荧光纳米水凝胶及其制备方法和使用方法。
本发明的荧光化合物是一类三芳基硼化合物,具有如下所示的通式I结构:
其中R1为芳基或杂芳基;R2、R3、R4、R5、R6相同或不相同,任选自烷基、烷氧基、烯基、炔基、环烷基、芳基、杂芳基、芳烷基、杂环基;所述R1、R2、R3、R4、R5、R6还可任选被以下取代基取代:烷基、氨基、烷氧基、烯基、炔基、环烷基、芳基、芳烷基、芳氧基、杂芳基、杂环基,上述取代基可以进一步被取代基取代,所述取代基可以为烷基、烷氧基、卤素等。
所述的烷基代表碳原子数为1-6的直链或支链烷基,例如,甲基、乙基、丙基、丁基、异丁基、叔丁基等。
所述的烯基代表碳原子数为2-6的直链或支链烯基,例如,乙烯、丙烯、丁烯等。
所述的炔基代表碳原子数为2-6的直链或支链炔基,例如,乙炔、丙炔、丁炔等。
所述的环烷基代表具有3-6个环原子的碳环,例如环己烷基。
所述的芳基指具有6-20个碳原子的单环或多环芳族基团,代表性的芳基包括:苯基、萘基、蒽基、芘基等。
所述的杂芳基指具有1-20个碳原子、1-4个选自N、S、O杂原子的单环或多环杂芳族基团,代表性的杂芳基包括:吡咯基、吡啶基、嘧啶基、咪唑基、噻唑基、吲哚基、氮杂萘基、氮杂蒽基、氮杂芘基等。
所述的杂环基指具有1-20个碳原子、1-4个选自N、S、O杂原子的饱和或不饱和的单环或多环杂环基团,优选具有1-10个碳原子、1-4个选自N、S、O杂原子的饱和或不饱和的单环或多环杂环基团,如氮杂环基,氮、氧杂环基,代表性的杂环基包括:四氢吡咯基、四氢吡啶基、哌嗪基、吗啉基等。
所述氨基代表基团-NX2,其中,X独立的选自氢、烷基、芳基、杂芳基、 杂环基。
本发明优选的技术方案是通式I化合物,其中R1任选自
本发明特别优选的技术方案选自:
本发明还提供了一种上述通式I化合物的制备方法,包括如下步骤:
其中R1、R2、R3、R4、R5、R6如前述所定义,
(a)在烷基锂存在下,将化合物1与化合物2进行反应,得到化合物3;
(b)将步骤(a)得到的化合物3与N,N-二取代甲酰胺和酰卤进行反应,得到化合物4;
(c)将步骤(b)中的化合物4与还原剂反应,得到化合物5;
(d)在三级膦和偶氮二羧酸酯或偶氮二羧酸酰胺存在下,将化合物5与化合物6(呋喃保护的马来酰亚胺)反应,然后再脱保护基,得到化合物I。
根据本发明,所述步骤(a)中,所述反应优选在有机溶剂(例如乙醚)下进行。所述烷基锂优选正丁基锂。优选的,在-120℃~-20℃(优选-78℃)的温度下向其中滴加烷基锂,并反应5min~1h(优选15min),接着升温至0℃~50℃ (优选25℃)后,反应10min~2h(优选30min)。优选的,在-120℃~-20℃(优选-78℃),滴加化合物1的溶液,并反应5min~1h(优选15min),接着升温至0℃~50℃(优选25℃)后,再反应2h~24h(优选12h)。优选的,在反应完成后用水洗,制得化合物3。所述化合物3的提纯方式优选硅胶柱色谱,优选石油醚-二氯甲烷体系或石油醚-乙酸乙酯体系。
根据本发明,所述步骤(b)中,所述反应优选在有机溶剂(例如1,2-二氯乙烷)下进行。所述N,N-二取代甲酰胺优选N,N-二甲基甲酰胺。所述酰氯优选三氯氧磷、二氯亚砜、草酰氯、二溴三苯基膦、三聚氰氯,更优选三氯氧磷。优选的,在-50℃~0℃(优选-20℃)的温度下向N,N-二取代甲酰胺中滴加三氯氧磷,反应5min~2h(优选30min)后升温至0℃~50℃(优选20℃),加入溶剂,反应5min~2h(优选30min)后降温至-100℃~0℃(优选-20℃),滴加化合物3的溶液,反应1h~8h(优选2h),再升温至50℃~120℃(优选83℃),反应2h~10h(优选3h),冷却至室温后加入水后生成化合物4。所述化合物4的提纯方式优选硅胶柱色谱,优选石油醚-二氯甲烷体系或石油醚-乙酸乙酯体系。
根据本发明,所述步骤(c)中,所述反应优选在有机溶剂(四氢呋喃)下进行。所述还原剂优选为硼氢化钠。优选的,反应温度-20℃~50℃(优选25℃),反应时间5min~3h(优选30min)。所述化合物5的提纯方式优选硅胶柱色谱,优选石油醚-二氯甲烷体系或石油醚-乙酸乙酯体系。
根据本发明,所述步骤(d)中,所述反应优选在有机溶剂(四氢呋喃)下进行。所述三级膦优选三苯基膦。所述偶氮二羧酸酯或偶氮二羧酸酰胺优选偶氮二甲酸二乙酯、偶氮二甲酸二叔丁酯、偶氮二甲酸二异丙酯、偶氮二甲酸二苄酯、偶氮二甲酰二哌啶、偶氮二甲酰胺,更优选偶氮二甲酸二异丙酯。所述脱保护反应优选在高温下脱去保护基,例如温度80℃~150℃(优选120℃)。优选的,在-100℃~-20℃(优选-78℃)的温度下,向三级膦溶液(溶剂优选四氢呋喃)中加入偶氮二羧酸酯或偶氮二羧酸酰胺,然后滴加化合物5的溶液(溶剂优选四氢呋喃),再加入化合物6,接着升温至0℃~80℃(优选25℃),反应5h~48h(优选24h),抽干溶剂后溶于沸点高于80℃溶剂(优选间三甲苯),温度80℃~150℃(优选120℃),反应15min~2h(优选30min),制得化合物I,提纯方式优选硅胶柱色谱,优选石油醚-二氯甲烷体系或石油醚-乙酸乙酯体系。
根据本发明,所述化合物1可以用现有技术中已知的方法制备。例如,将2-溴-1,3,5-三甲基苯加入含有镁、格氏试剂引发剂的体系中反应,再与硼酸酯进行反应,得到化合物1。所述反应优选在有机溶剂(例如四氢呋喃)下进行。所述格氏试剂引发剂优选为碘甲烷、碘或1,2-二溴乙烷,更优选为1,2-二溴乙烷。所述硼酸酯优选硼酸三甲酯。2-溴-1,3,5-三甲基苯与镁、格氏试剂引发剂的反应温度优选为40℃~120℃(更优选66℃),反应时间优选为30min~10h(更优选2h)。硼酸酯参与的反应优选分段控温,第一阶段温度-100℃~0℃(优选-20℃),反应时间10min~3h(优选1h),第二阶段温度0℃~80℃(优选25℃),反应时间4~48h(优选12h)。所述化合物1的提纯方式优选减压蒸馏。
本发明的式I化合物可作为巯基化合物的单、双光子荧光探针。在式I化合物中,所含有的马来酰亚胺基团向硼-π-氮结构(硼-芳基-氮结构或者硼-杂芳基-氮结构)发生光致电子转移作用,导致原本具有较强单光子、双光子光致发光性质的硼-π-氮结构的发光被猝灭,而巯基可以与式I化合物中的马来酰亚胺基团发生Michael加成反应,使马来酰亚胺基团的双键被破坏,从而阻碍了该光致电子转移过程,使得式I化合物中硼-π-氮结构的发光重新显现,因此,通过检测式I化合物的发光变化,即可检测巯基化合物的存在与否,示意图见图3。
因此本发明进一步提供了所述式I化合物的用途,其用作巯基化合物的单、双光子荧光探针。
本发明还提供了式I化合物对巯基化合物的检测方法,包括:配制式I化合物的溶液(浓度优选为10-7~10-4mol/l),加入含有巯基化合物的待检测溶液,紫外灯下肉眼观察或者光谱记录式I化合物的单光子或双光子荧光变化。
本发明的式I化合物对巯基化合物的检测,可以在有机溶剂(例如环己烷、正己烷、甲苯、邻二甲苯、间二甲苯、对二甲苯、苯、邻二氯苯、间二氯苯、对二氯苯、二氯甲烷、氯仿、四氢呋喃、乙醚、乙酸乙酯、1,4-二氧六环、甲醇、乙醇、乙腈、二甲基亚砜、三氯甲烷等可溶解式I化合物的一种或几种的混合溶剂)中进行,也可以在有机溶剂-水混合体系(有机溶剂包括四氢呋喃、乙醇、甲醇、乙腈、二甲基亚砜、N,N-二甲基甲酰胺等可以与水混溶的一种或几种,优选水的含量不超过10%体积分数)中进行。
本发明进一步提供了一种含有上述式I化合物的纳米水凝胶。
本发明还提供了一种制备所述含有式I化合物的纳米水凝胶的方法,包括:
1)将聚(环氧乙烷)-聚(环氧丙烷)嵌段高分子溶于水中,加入自由基引发剂进行反应,得到纳米水凝胶;
2)将纳米水凝胶溶胀于有机溶剂中,加入式I化合物的溶液,再除去溶剂,然后将所得到的固体分散在水或缓冲溶液中,制得含有式I化合物的纳米水凝胶体系。
根据本发明,在所述制备方法的步骤1)中,优选的,将聚(环氧乙烷)-聚(环氧丙烷)嵌段高分子溶于水中制成浓度为1%~25%w/v的溶液(优选10%w/v),加入自由基引发剂,自由基引发剂与聚(环氧乙烷)-聚(环氧丙烷)嵌段高分子的质量比为1:(5~200)(优选1:10),在惰性气体的保护下,在20℃~90℃(优选60℃)反应12h~72h(优选24h),纯化方法优选透析后抽干水分,制得纳米水凝胶。
根据本发明,所述聚(环氧乙烷)-聚(环氧丙烷)嵌段高分子为聚(环氧乙烷)-聚(环氧丙烷)二嵌段高分子或聚(环氧乙烷)-聚(环氧丙烷)-聚(环氧乙烷)三嵌段高分子,优选聚(环氧乙烷)-聚(环氧丙烷)-聚(环氧乙烷)三嵌段高分子,更优选地,为P-105、F-127、P-123、F-108。
根据本发明,所述自由基引发剂为有机过氧化物类引发剂,偶氮类引发剂的一种或几种。优选地,所述有机过氧化物类引发剂选自氢过氧化异丙苯、氢过氧化特丁基、过氧化二苯甲酰、过氧化十二酰、过氧化二特丁基、过氧化二 异丙苯、过氧化二碳酸二异丙酯。优选地,所述偶氮类引发剂包括偶氮二异丁腈、偶氮二异庚腈。更优选地,所述引发剂为过氧化苯甲酰或偶氮二异丁腈。
根据本发明,在所述制备方法的步骤2)中,优选的,将式I化合物浓度为0.01~1mg/ml(优选0.1mg/ml)的溶液(溶剂优选四氢呋喃)加入纳米水凝胶浓度为0.1~10mg/ml(优选1mg/ml)有机溶剂分散体系(溶剂优选甲醇)中,式I化合物与纳米水凝胶质量比为1:(5~500)(优选1:10),真空除去溶剂,加入水或缓冲溶液(如磷酸缓冲液、HEPES缓冲液、Tris-HCl缓冲液等,pH值为3~9,优选7.2)分散,纳米水凝胶与加入水或缓冲溶液的质量/体积比为(0.01~100)mg/ml(优选1mg/ml),制得含有式I化合物的纳米水凝胶巯基探针体系。
本发明还提供了一种所述含有式I化合物的纳米水凝胶的用途,其用作巯基(特别是生物巯基化合物)探针。用于特异性检测底物中的巯基。
本发明制备的含有式I化合物的纳米水凝胶巯基探针对生物巯基化合物的选择具有专一性,与生物巯基化合物结构类似的其他化合物(如其他19种生物氨基酸)对化合物的发光性能和检测过程几乎无影响。
本发明制备的含有式I化合物的纳米水凝胶巯基探针可自主进入NIH/3T3细胞,并用于细胞内巯基化合物的单光子、双光子荧光标记和单光子、双光子荧光显微成像。
本发明还进一步提供了一种检测水溶液体系中巯基化合物的方法,包括:将本发明所述的含有式I化合物的纳米水凝胶巯基探针体系加入到含有巯基化合物的待检测水溶液(优选含有生物巯基化合物的水溶液)中,紫外灯下肉眼观察或者光谱记录式I化合物的单光子或双光子荧光变化。
根据本发明,所述生物巯基化合物包括半胱氨酸、同型半胱氨酸、谷胱甘肽等。
本发明提供的基于三芳基硼类化合物的荧光探针及含有该化合物的纳米水凝胶探针的优点在于:既可用于单光子荧光检测,又可以用于双光子荧光检测;既可用于有机溶液体系,也可用于水体系;对巯基化合物响应的专一性好,速度快(5min~2h),范围宽(0.2~5000μmol/l);纳米水凝胶探针的生物相容性好,细胞毒性低,可自主进入细胞。
附图说明
图1:本发明实施例7中制备的含有化合物Ia的交联F-127纳米水凝胶巯基探针体系加入0.5mmol/l半胱氨酸之后的(a)单光子荧光光谱及(b)双光子荧光光谱随时间变化情况。
图2:本发明实施例7中制备的含有化合物Ia的交联F-127纳米水凝胶巯基探针体系加入0.5mmol/l其他氨基酸10min后470nm处单光子荧光强度与不加入氨基酸该处荧光强度的比值(黑色),以及加入0.5mmol/l其他氨基酸30min后再加入0.5mmol/l半胱氨酸10min后470nm处单光子荧光强度与不加入氨基酸该处荧光强度的比值(斜线),其中1为空白,2为丙氨酸,3为精氨酸,4为天冬酰胺,5为天冬氨酸,6为谷氨酰胺,7为谷氨酸,8为甘氨酸、 9为组氨酸、10为异亮氨酸、11为亮氨酸、12为赖氨酸、13为蛋氨酸、14为苯丙氨酸、15为脯氨酸、16为丝氨酸、17为苏氨酸、18为色氨酸、19为酪氨酸、20为缬氨酸。
图3:使用本发明化合物检测巯基化合物的原理图。
具体实施例
为了进一步说明本发明的指导思想,给出下列系列具体实施例,但本发明并不受这些具体实施例的限制,任何了解该领域的技术人员对本发明的些许改动将可以达到类似的结果,这些改动也包含在本发明之中。
实施例1
制备化合物1:
在氩气保护下,19.909g(100.00mmol)2-溴-1,3,5-三甲基苯溶于50ml四氢呋喃中,滴加入含有0.25ml(2.9mmol)1,2-二溴乙烷、4.860g(200.0mmol)镁、5ml四氢呋喃的混合体系中,加热回流3h,冷却至室温,制得棕色混合物。将棕色混合物滴加至50ml含有5.196g(50mmol)硼酸三甲酯的四氢呋喃溶液中,冰盐浴1h,再升至室温反应12h,减压蒸馏得到1,为白色固体,9.107g(产率65%)。 1H-NMR(300MHz,CDCl3,ppm)δ=2.17(s,12H),2.24(s,6H),3.68(s,3H),6.65(s,4H).EI-MS(C19H25BO):m/z=280.2.
实施例2
制备Ia的中间体3(Ia):
氩气保护下,2.7ml正丁基锂(浓度为2.2M的正己烷溶液,6.0mmol)滴加入40.0ml含有1.945g(6.000mmol)二(4-溴苯基)苯胺的乙醚溶液,反应温度为-78℃,搅拌15min后,升至室温,搅拌1h,再降至-78℃,滴加含有1.401g(5.000mmol)的化合物1,升至室温,反应12h,真空除去溶剂,水洗,柱色谱(硅胶,展开剂:二氯甲烷:石油醚=1:10,v/v)分离,得到3(Ia),黄色固体1.703g(产率69%)。1HNMR(300MHz,d-DMSO)δ=7.36-7.31(m,6H),7.23–7.10(m,6H),7.01–6.90(m,2H),6.83(s,4H),2.35(s,6H),2.06(s,12H).MALDI-TOF(C36H36BN):m/z=493.3.
实施例3
制备Ia的中间体4(Ia):
氩气保护下,1.135g(7.500mmol)三氯氧磷滴加至冰盐浴冷却的0.365g(5.000mmol)N,N-二甲基甲酰胺,反应30min后升至室温,加入10ml 1,2-二氯乙烷,反应30min后用冰盐浴冷却,滴加25ml含有1.233g(2.500mmol)化 合物3(Ia)的1,2-二氯乙烷溶液,反应2h后,撤去冰盐浴,升温回流3h,冷却至室温,醋酸钠水溶液洗,水洗后,抽干溶剂,柱色谱(硅胶,展开剂:二氯甲烷:石油醚=1:1,v/v)分离,得到4(Ia),黄色粉末0.965g(产率74%)。1H-NMR(300MHz,CDCl3,ppm)δ=9.85(s,1H),7.72(d,J=8.6Hz,2H),7.44(d,J=8.3Hz,2H),7.36(t,J=8.0Hz,2H),7.22-7.12(m,5H),7.04(d,J=8.3Hz,2H),6.81,(s,4H),2.30(s,6H),2.05(s,12H).MALDI-TOF(C37H36BNO):[M+H]+=522.4.
实施例4
制备Ia中间体5(Ia):
将0.113g(3.00mmol)硼氢化钠加入20ml含有0.782g(1.50mmol)化合物4(Ia)的四氢呋喃溶液,室温反应30min,抽干溶剂,水洗,柱色谱(硅胶,展开剂:二氯甲烷:石油醚=3:2,v/v)分离,得到5(Ia),黄色粉末0.743g(产率95%)。 1H-NMR(300MHz,d-DMSO,ppm)δ=7.40-7.25(m,4H),7.21(d,J=8.5,2H),7.17-7.03(m,5H),6.86-6.71(m,6H),5.18(t,J=5.7Hz,1H),4.47(d,J=5.7Hz,2H),2.22(s,6H),1.96(s,12H).MALDI-TOF(C37H38BNO):m/z=523.3.
实施例5
制备化合物Ia:
在氩气保护下,0.242g(1.20mmol)偶氮二甲酸二异丙基酯加入冷却至-70℃的25.0ml含有0.315g(1.20mmol)三苯基膦的四氢呋喃溶液,然后滴加25.0ml含有0.524g(1.00mmol)化合物5(Ia)的四氢呋喃溶液,再加入0.198g(1.20mmol)呋喃保护的马来酰亚胺,接着升至室温,反应24h,抽干溶剂,再溶于50.0ml间三甲苯,120℃反应30min,抽干溶剂,柱色谱(硅胶,乙酸乙酯:石油醚=1:10)分离,得到化合物Ia,黄色固体0.282g(产率47%)。1H-NMR(300MHz,d-DMSO,ppm)δ=7.35(t,J=7.8Hz,2H),7.22(d,J=8.4Hz,4H),7.16(d,J=7.4Hz,1H),7.13–7.02(m,6H),6.88–6.74(m,6H),4.56(s,2H),2.23(s,6H),1.96(s,12H).HR MALDI-TOF(C41H39BN2O2):m/z=602.31001,calc.602.31046.
实施例6
制备含有化合物Ia的交联F-127纳米水凝胶巯基探针体系,其制备路线如下:
将0.200g过氧化苯甲酰加入20.0ml含有2.000gF-127的水溶液中,通入氩气1h后,升温至60℃,持续通入氩气并搅拌反应24h,冷却至室温后,对水透析24h,平均3h换一次水,真空抽干水分,得到交联F-127纳米水凝胶,白色蜡状固体。
将100μl浓度为0.10mg/ml的化合物Ia的THF溶液加入含有10.0交联 F-127纳米水凝胶的20.0ml甲醇溶液分散体系中,抽干溶剂,加入10.0mM磷酸缓冲液(10mM,pH值7.2),固体充分分散后得到含有化合物Ia的交联F-127纳米水凝胶巯基探针体系。
实施例7
利用含有化合物Ia的交联F-127纳米水凝胶巯基探针体系的单、双光子荧光检测水溶液中半胱氨酸的方法,具体如下:
取实施例6中制备的化合物Ia的交联F-127纳米水凝胶巯基探针体系,向其中加入半胱氨酸,使它们的浓度为0.5mmol/l,测量不同时间的单光子和双光子荧光光谱(见附图1),单光子荧光的激发波长为385nm,双光子荧光的激发波长为790nm,随着时间变化,化合物Ia在470nm处的荧光不断增强,在10min之内达到最大值。
相同条件下加入相同浓度的丙氨酸、精氨酸、天冬酰胺、天冬氨酸、谷氨酰胺、谷氨酸、甘氨酸、组氨酸、异亮氨酸、亮氨酸、赖氨酸、蛋氨酸、苯丙氨酸、脯氨酸、丝氨酸、苏氨酸、色氨酸、酪氨酸、缬氨酸,化合物Ia的在470nm处几乎没有发光(见附图2)。
相同条件下加入相同浓度的丙氨酸、精氨酸、天冬酰胺、天冬氨酸、谷氨酰胺、谷氨酸、甘氨酸、组氨酸、异亮氨酸、亮氨酸、赖氨酸、蛋氨酸、苯丙氨酸、脯氨酸、丝氨酸、苏氨酸、色氨酸、酪氨酸、缬氨酸,再加入相同浓度的半胱氨酸,化合物Ia的在470nm处的单光子发光与只加入半胱氨酸的情况基本一致(见附图2)。
实施例8
利用含有化合物Ia的交联F-127纳米水凝胶巯基探针体系对NIH/3T3细胞中巯基化合物单、双光子荧光成像的方法,具体如下:
取两组NIH/3T3细胞,向其中一组细胞的培养液(1ml)中加入100μl实施例6中制备的化合物Ia的交联F-127纳米水凝胶巯基探针体系,另一组作为对照,培养30min后,在荧光共聚焦显微镜和双光子显微镜下成像,对照组无荧光,而实验组呈现强烈的荧光。
Claims (10)
1.通式I化合物,
其中R1为芳基或杂芳基;R2、R3、R4、R5、R6相同或不相同,任选自烷基、烷氧基、烯基、炔基、环烷基、芳基、杂芳基、芳烷基、杂环基;所述R1、R2、R3、R4、R5、R6还可任选被以下取代基取代:烷基、氨基、烷氧基、烯基、炔基、环烷基、芳基、芳烷基、芳氧基、杂芳基、杂环基,上述取代基可以进一步被取代基取代,所述取代基可以为烷基、烷氧基、卤素等。
2.如权利要求1所述的化合物,其中R1任选自
3.如权利要求1所述的化合物,其选自:
4.权利要求1-2任一项所述的化合物的制备方法,包括如下步骤:
其中R1、R2、R3、R4、R5、R6如前述所定义,
(a)在烷基锂存在下,将化合物1与化合物2进行反应,得到化合物3;
(b)将步骤(a)得到的化合物3与N,N-二取代甲酰胺和酰卤进行反应,得到化合物4;
(c)将步骤(b)中的化合物4与还原剂反应,得到化合物5;
(d)在三级膦和偶氮二羧酸酯或偶氮二羧酸酰胺存在下,将化合物5与化合物6(呋喃保护的马来酰亚胺)反应,然后再脱保护基,得到通式I化合物。
5.权利要求1-3任一项所述的化合物的用途,其用作巯基化合物的单或双光子荧光探针。
6.一种巯基化合物的检测方法,包括:将权利要求1-3任一项所述的式I化合物(例如浓度优选为10-7~10-4mol/l的溶液),加入含有巯基化合物的待检测溶液,紫外灯下肉眼观察或者光谱记录式I化合物的单光子或双光子荧光变化;
优选的,所述检测方法可以在有机溶剂(例如环己烷、正己烷、甲苯、邻二甲苯、间二甲苯、对二甲苯、苯、邻二氯苯、间二氯苯、对二氯苯、二氯甲烷、氯仿、四氢呋喃、乙醚、乙酸乙酯、1,4-二氧六环、甲醇、乙醇、乙腈、二甲基亚砜、三氯甲烷等可溶解式I化合物的一种或几种的混合溶剂)中进行,也可以在有机溶剂-水混合体系(有机溶剂包括四氢呋喃、乙醇、甲醇、乙腈、二甲基亚砜、N,N-二甲基甲酰胺等可以与水混溶的一种或几种,优选水的含量不超过10%体积分数)中进行。
7.含有权利要求1-3任一项所述的式I化合物的纳米水凝胶。
8.一种制备权利要求7所述的纳米水凝胶的方法,包括:
1)将聚(环氧乙烷)-聚(环氧丙烷)嵌段高分子溶于水中,加入自由基引发剂进行反应,得到纳米水凝胶;
2)将纳米水凝胶溶胀于有机溶剂中,加入权利要求1-3任一项所述的式I化合物的溶液,除去溶剂,再将所得到的固体分散在水或缓冲溶液中,得到含有式I化合物的纳米水凝胶体系;
在步骤1)中,优选的,将聚(环氧乙烷)-聚(环氧丙烷)嵌段高分子溶于水中制成浓度为1%~25%w/v的溶液(优选10%w/v),加入自由基引发剂,自由基引发剂与聚(环氧乙烷)-聚(环氧丙烷)嵌段高分子的质量比为1:(5~200)(优选1:10),在惰性气体的保护下,在20℃~90℃(优选60℃)反应12h~72h(优选24h);
优选的,所述聚(环氧乙烷)-聚(环氧丙烷)嵌段高分子为聚(环氧乙烷)-聚(环氧丙烷)二嵌段高分子或聚(环氧乙烷)-聚(环氧丙烷)-聚(环氧乙烷)三嵌段高分子,优选聚(环氧乙烷)-聚(环氧丙烷)-聚(环氧乙烷)三嵌段高分子,更优选地,为P-105、F-127、P-123、F-108;
优选的,所述自由基引发剂为有机过氧化物类引发剂、偶氮类引发剂的一种或几种;优选地,所述有机过氧化物类引发剂选自氢过氧化异丙苯、氢过氧化特丁基、过氧化二苯甲酰、过氧化十二酰、过氧化二特丁基、过氧化二异丙苯、过氧化二碳酸二异丙酯;优选地,所述偶氮类引发剂包括偶氮二异丁腈、偶氮二异庚腈;更优选地,所述引发剂为过氧化苯甲酰或偶氮二异丁腈;
在步骤2)中,优选的,将式I化合物浓度为0.01~1mg/ml(优选0.1mg/ml)的溶液(溶剂优选四氢呋喃)加入纳米水凝胶浓度为0.1~10mg/ml(优选1mg/ml)有机溶剂分散体系(溶剂优选甲醇)中,式I化合物与纳米水凝胶质量比为1:(5~500)(优选1:10),真空除去溶剂,加入水或缓冲溶液(如磷酸缓冲液、HEPES缓冲液、Tris-HCl缓冲液等,pH值为3~9,优选7.2)分散,纳米水凝胶与加入水或缓冲溶液的质量/体积比为(0.01~100)mg/ml(优选1mg/ml),制得含有式I化合物的纳米水凝胶。
9.权利要求7所述的纳米水凝胶的用途,其用作巯基探针,特别的,用于生物巯基化合物,优选的,所述纳米水凝胶能够自主进入到细胞中,用于细胞内巯基化合物的单光子、双光子荧光标记和单光子、双光子荧光显微成像。
10.一种检测水溶液体系中巯基化合物的方法,包括:将权利要求7所述的纳米水凝胶加入到含有巯基化合物的待检测水溶液(优选含有生物巯基化合物的水溶液)中,紫外灯下肉眼观察或者光谱记录式I化合物的单光子或双光子荧光变化;所述生物巯基化合物优选包括半胱氨酸、同型半胱氨酸、谷胱甘肽等。
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