CN115745998A - 光催化合成水粉蕈素及其类似物的方法 - Google Patents
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- MRWXACSTFXYYMV-FDDDBJFASA-N nebularine Chemical compound O[C@@H]1[C@H](O)[C@@H](CO)O[C@H]1N1C2=NC=NC=C2N=C1 MRWXACSTFXYYMV-FDDDBJFASA-N 0.000 title claims abstract description 20
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/55—Design of synthesis routes, e.g. reducing the use of auxiliary or protecting groups
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Abstract
本发明公开了光催化合成水粉蕈素及其类似物的方法,属于药物化学技术领域。在有机溶剂中,以6‑位带有离去基团的嘌呤衍生物为原料,加入催化量乙基黄原酸盐和氢源,采用有机胺作为缚酸剂,可见光照射反应,得到水粉蕈素及其类似物。本发明光催化脱除离去基团的方法,不需要额外添加光催化剂,无需重金属催化剂,仅采用可见光照射,成本低,操作简单,安全系数高。
Description
技术领域
本发明属于药物化学技术领域,具体涉及一种光催化反应合成水粉蕈素及其类似物的方法。
背景技术
嘌呤衍生物和天然存在的腺嘌呤结构的区别是6位没有取代基,从而作为腺嘌呤的类似物,可以作为“万能核苷”与其他四种核苷发生碱基配对,具有重要的生物学意义,在化学治疗、生物化学和化学合成方面有着广泛的应用。如水粉蕈素,又叫烟云杯伞素,英文名Nebularine,是从真菌水粉杯伞中分离得到的一种天然核苷类化合物,具有强烈的抗真菌活性,能抑制分枝杆菌和噬菌体的增生,同时对小白鼠肉瘤180有抑制作用。同样,6位不带取代基的嘌呤衍生物法昔洛韦是一种抗病毒药物,用于治疗带状疱疹和生殖器疱。另外,水粉蕈素及其类似物还具有重要的合成意义,其嘌呤环上含有三个活泼的C-H键,可以通过发生官能团化反应而作为合成非天然核苷的原料,如用于合成6-烷基嘌呤核苷、脱氨酶抑制剂助间型霉素等。
水粉蕈素及其类似物现有合成方法有:(1)腺嘌呤衍生物经保护基保护敏感基团后,氨基在亚硝酸酯作用下发生重氮化-脱氨反应。该方法不仅用到易燃的亚硝酸酯,而且重氮化反应容易爆炸,难以扩大反应规模。(2)6-氯嘌呤核苷及其类似物在Pd/C催化下氢解还原得到。该方法缺点是催化剂成本高,操作难度大,而且6-氯嘌呤核苷的合成步骤多,价格较高。(3)申请人公开报道采用6-三苯基膦嘌呤、6-肼基嘌呤或6-巯基嘌呤衍生物转化为水粉蕈素及其类似物的方法,但是总体上反应条件较为苛刻。
发明内容
为了解决现有技术的不足,本发明提供了一种6-位带有离去基团的嘌呤衍生物(Ⅰ)为原料,加入催化量乙基黄原酸盐,以有机胺作为缚酸剂,在氢源存在下,可见光照射室温反应,得到水粉蕈素及其类似物(Ⅱ)的方法。通过采用该方法得到水粉蕈素及其类似物,成本低,操作简便,反应条件温和,底物适应性好,表明了该合成方法的优越性和简便性。
本发明的技术方案是:光催化合成水粉蕈素及其类似物的方法,反应方程式如下:
包括以下步骤:在有机溶剂中,以6-位带有离去基团的嘌呤衍生物(Ⅰ)为原料,在催化量乙基黄原酸盐和氢源存在下,采用有机胺作为缚酸剂,可见光照射反应,得到水粉蕈素及其类似物(Ⅱ);
其中:LG选自氯、溴、碘、磺酰基、吡啶盐;乙基黄原酸盐中M选自碱金属或碱土金属;氢源选自1,4-环己二烯、次磷酸、甲酸钠;R1选自氢、烷基、烯丙基、苄基、2-氯苄基、 P选自氢、乙酰基或苯甲酰基;R2选自氢、氯、氟、甲氧基或氨基。
进一步地,在上述技术方案中,所述6-位带有离去基团嘌呤衍生物I与乙基黄原酸盐摩尔比为1:0.1~0.5。
进一步地,在上述技术方案中,所述有机溶剂为乙腈、氯仿、二甲基亚砜、乙酸乙酯、二氯甲烷中的一种或多种。
进一步地,在上述技术方案中,反应温度为0-30℃,反应时间为1~24h。
进一步地,在上述技术方案中,所述可见光为LED灯产生的光,LED灯功率2~50W,反应时LED灯距离反应容器2~10cm。
通过采用该方法得到水粉蕈素及其类似物,成本低,操作简便,反应条件温和,底物适应性好,表明了该合成方法的优越性和简便性。
具体实施方式
下面结合实施例对本发明做详细说明。
实施例1:
在透明玻璃反应瓶内,加入(0.245g,1mmol)和乙基黄原酸钾(0.016g,0.1mmol)加入到乙腈(2mL)中,再加入三乙胺(0.152mL,1.1mmol),打开10W可见白光,搅拌,室温下照射反应10h,TLC显示原料反应完全,将反应液减压浓缩,柱层析分离得到0.172g,收率82%。白色固体,m.p.90-92℃;1H NMR(400MHz,CDCl3)δ9.14(s,1H),9.01(s,1H),8.08(s,1H),7.35-7.28(m,5H),5.45(s,2H);13C NMR(100MHz,CDCl3)δ152.6,151.2,148.1,145.1,134.6,133.7,129.0,128.3,127.3,47.0。
实施例3:
在透明玻璃反应瓶内,加入(0.324g,1mmol)和乙基黄原酸钾(0.016g,0.1mmol)加入到乙腈(2mL)中,再加入三乙胺(0.152mL,1.1mmol),打开10W可见白光,搅拌,室温下照射反应10h,TLC显示原料反应完全,将反应液减压浓缩,柱层析分离得到0.168g,收率80%。白色固体,m.p.90-92℃;1H NMR(400MHz,CDCl3)δ9.14(s,1H),9.01(s,1H),8.08(s,1H),7.35-7.28(m,5H),5.45(s,2H);13C NMR(100MHz,CDCl3)δ152.6,151.2,148.1,145.1,134.6,133.7,129.0,128.3,127.3,47.0。
实施例4:
在透明玻璃反应瓶内,加入(0.380g,1mmol)和乙基黄原酸钾(0.016g,0.1mmol)加入到乙腈(2mL)中,再加入三乙胺(0.152mL,1.1mmol),打开10W可见白光,搅拌,室温下照射反应10h,TLC显示原料反应完全,将反应液减压浓缩,柱层析分离得到0.178g,收率85%。白色固体,m.p.90-92℃;1H NMR(400MHz,CDCl3)δ9.14(s,1H),9.01(s,1H),8.08(s,1H),7.35-7.28(m,5H),5.45(s,2H);13C NMR(100MHz,CDCl3)δ152.6,151.2,148.1,145.1,134.6,133.7,129.0,128.3,127.3,47.0。
实施例5:
在透明玻璃反应瓶内,加入(0.194g,1mmol)和乙基黄原酸钾(0.016g,0.1mmol)加入到乙腈(2mL)中,再加入2,6-二甲基吡啶(0.128mL,1.1mmol),打开10W可见白光,搅拌,室温下照射反应10h,TLC显示原料反应完全,将反应液减压浓缩,柱层析分离得到0.124g,收率78%。白色固体,m.p.50-52℃;1H NMR(CDCl3,400MHz)δ9.15(s,1H),8.93(s,1H),8.08(s,1H),6.02-6.10(m,1H),5.30(d,J=9.6Hz,2H),5.24(d,J=17.2Hz,1H);13C NMR(CDCl3,100MHz)δ153.2,152.2,149.1,134.6,132.5,121.7,118.0,48.7。
实施例6:
在透明玻璃反应瓶内,加入(0.413g,1mmol)和乙基黄原酸钾(0.016g,0.1mmol)加入到乙腈(2mL)中,再加入2,6-二甲基吡啶(0.128mL,1.1mmol),打开10W可见白光,搅拌,室温下照射反应10h,TLC显示原料反应完全,将反应液减压浓缩,柱层析分离得0.291g,收率77%。无色油状物;1H NMR(CDCl3,400MHz)δ9.12(s,1H),8.99(s,1H),8.22(s,1H),6.22(d,J=5.2Hz,1H),5.94(s,1H),5.60(s,1H),4.41-4.30(m,3H),2.13(s,3H),2.10(s,3H),2.07(s,3H);13C NMR(CDCl3,100MHz)δ170.5,169.0,168.6,152.0,150.9,149.2,143.6,134.5,86.2,80.0,73.0,70.9,63.5,20.2,20.1,19.8。
以上显示和描述了本发明的基本原理和主要特征和本发明的优点。本行业的技术人员应该了解,本发明不受上述实施例的限制,上述实施例和说明书中描述的只是说明本发明的原理,在不脱离本发明精神和范围的前提下,本发明还会有各种变化和改进,这些变化和改进都落入要求保护的本发明范围内。本发明要求保护范围由所附的权利要求书及其等效物界定。
Claims (5)
2.根据权利要求1所述光催化合成水粉蕈素及其类似物的方法,其特征在于:6-位带有离去基团的嘌呤衍生物I与乙基黄原酸盐摩尔比为1:0.1~0.5。
3.根据权利要求1所述光催化合成水粉蕈素及其类似物的方法,其特征在于:所述有机溶剂为乙腈、氯仿、二甲基亚砜、乙酸乙酯、二氯甲烷中的一种或多种。
4.根据权利要求1所述光催化合成水粉蕈素及其类似物的方法,其特征在于:反应温度为0-30℃,反应时间为1~24h。
5.根据权利要求1-4任意一项所述光催化合成水粉蕈素及其类似物的方法,其特征在于:所述可见光为LED灯产生的光,LED灯功率2~50W,反应时LED灯距离反应容器2~10cm。
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