CN105646154A - 一种新型含保护基的3-烯丙基苯酚衍生物的合成和脱保护的方法 - Google Patents
一种新型含保护基的3-烯丙基苯酚衍生物的合成和脱保护的方法 Download PDFInfo
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Abstract
本发明公开了一种新型含保护基的3-烯丙基苯酚衍生物的合成和脱保护的方法。本发明以市售的含对甲氧苄基保护基的3-溴苯酚为原料,经过硼酸酯化反应和Suzuki偶联,生成含对甲氧苄基保护基的3-烯丙基苯酚衍生物,该衍生物经过酸处理,很容易地得到3-烯丙基苯酚,填补了该新型分子的合成方法的空白,后处理简单,适合工业化。
Description
技术领域
本发明涉及的是有机化学技术领域,具体涉及一种新型含保护基的3-烯丙基苯酚衍生物的合成和脱保护的方法。
背景技术
烯丙基苯酚及其衍生物由于其具有特殊的结构,表现出许多独特的性能及生物活性,在制备金属有机化合物的配体、有机高性能功能材料、染料、农药和医药等多领域具有的广泛研究和应用。本发明所涉及到的3-烯丙基苯酚被报道作为重要的中间体用于BACE的抑制剂的新药(WO2008135488(A1))。令人遗憾的是,目前和3-烯丙基苯酚相关的合成的报道很少,且仅限于有甲基和苄基保护基的和方法和用很苛刻的方法脱保护基。文献的方法具体归纳如下:
此种方法的特点:格氏试剂的合成条件较苛刻,收率低(文献报道28%),成本高,脱保护要用到低沸点的BBr3、BCl3,三废量大,放大反应容易出现事故,不利于工业化生产。
此种方法的特点:有机锡试剂毒性大,脱保护用到低沸点的BBr3、BCl3,三废量大,放大反应容易出现事故,不利于工业化生产。
发明内容
针对现有技术上存在的不足,本发明目的是在于提供一种新型含保护基的3-烯丙基苯酚衍生物的合成和脱保护的方法,以市售的含对甲氧苄基保护基的3-溴苯酚为原料,经过硼酸酯化反应和Suzuki偶联,生成含对甲氧苄基保护基的3-烯丙基苯酚衍生物,该衍生物经过酸处理,很容易地得到3-烯丙基苯酚,填补了该新型分子的合成方法的空白,后处理简单,适合工业化。
为了实现上述目的,本发明是通过如下的技术方案来实现:一种新型含保护基的3-烯丙基苯酚衍生物的合成和脱保护的方法,其反应式为:
其反应步骤为:(a)在惰性气体保护下,将原料6、7,NaOAc,Pd(dppf)Cl2溶解在惰性溶剂(通常用到的该反应类型的溶剂,如甲苯、二氧六环、DMF、DMAC、NMP等等)里,在50-130℃溶液温度下搅拌反应,检测6完全转化以后(通常反应0.5~24小时),减压蒸馏除去溶剂,残留物用难溶于水的惰性溶剂(通常用二氯甲烷、三氯甲烷、甲苯、乙酸乙酯等等)溶解,将不溶物过滤除去。用水洗涤滤液,浓缩得到8的粗产品,用有机化学中常用的纯化方法纯化(层析、重结晶、蒸馏)或者直接用于下一步反应。
8的粗产品纯化:用有机化学中常用的纯化方法纯化(层析、重结晶、蒸馏)或者直接用于下一步反应。
原料配方摩尔比:6/7/NaOAc/Pd(dppf)Cl2=1/1~3/1~3/0.005~0.05;
(b)该反应为有机合成通常的反应条件和方法。优选的方法如下:在惰性气体保护下,将8、烯丙基溴、Pd(PPh3)4,Na2CO3溶解在含有10%水的二氧六环中,在60~120℃溶液温度下搅拌反应,检测6完全转化以后(通常反应0.1~12小时),后处理。处理方法为通常有机合成方法中该反应类型的常用方法:减压蒸馏,柱层析,或者低温重结晶。
(c)该反应为有机合成通常的反应条件和方法。优选的方法如下:在惰性气体保护下,将9溶解在含有10%的三氟乙酸的二氯甲烷中,在0~40℃溶液温度下搅拌反应,检测9完全转化以后(通常反应0.1~12小时),后处理。处理方法为通常有机合成方法中该反应类型的常用方法:减压蒸馏,柱层析,或者低温重结晶。
本发明的有益效果:本发明以市售的含对甲氧苄基保护基的3-溴苯酚为原料,经过硼酸酯化反应和Suzuki偶联,生成含对甲氧苄基保护基的3-烯丙基苯酚衍生物,该衍生物经过酸处理,很容易地得到3-烯丙基苯酚,填补了该新型分子的合成方法的空白,后处理简单,适合工业化。
具体实施方式
为使本发明实现的技术手段、创作特征、达成目的与功效易于明白了解,下面结合具体实施方式,进一步阐述本发明。
本具体实施方式采用以下技术方案:一种新型含保护基的3-烯丙基苯酚衍生物的合成和脱保护的方法,其反应式为:
其反应步骤为:(a)在惰性气体保护下,将原料6、7,NaOAc,Pd(dppf)Cl2溶解在惰性溶剂(通常用到的该反应类型的溶剂,如甲苯、二氧六环、DMF、DMAC、NMP等等)里,在50-130℃溶液温度下搅拌反应,检测6完全转化以后(通常反应0.5~24小时),减压蒸馏除去溶剂,残留物用难溶于水的惰性溶剂(通常用二氯甲烷、三氯甲烷、甲苯、乙酸乙酯等等)溶解,将不溶物过滤除去。用水洗涤滤液,浓缩得到8的粗产品,用有机化学中常用的纯化方法纯化(层析、重结晶、蒸馏)或者直接用于下一步反应。
的粗产品纯化:用有机化学中常用的纯化方法纯化(层析、重结晶、蒸馏)或者直接用于下一步反应。
原料配方摩尔比:6/7/NaOAc/Pd(dppf)Cl2=1/1~3/1~3/0.005~0.05;
(b)该反应为有机合成通常的反应条件和方法。优选的方法如下:在惰性气体保护下,将8、烯丙基溴、Pd(PPh3)4,Na2CO3溶解在含有10%水的二氧六环中,在60~120℃溶液温度下搅拌反应,检测6完全转化以后(通常反应0.1~12小时),后处理。处理方法为通常有机合成方法中该反应类型的常用方法:减压蒸馏,柱层析,或者低温重结晶。
(c)该反应为有机合成通常的反应条件和方法。优选的方法如下:在惰性气体保护下,将9溶解在含有10%的三氟乙酸的二氯甲烷中,在0~40℃溶液温度下搅拌反应,检测9完全转化以后(通常反应0.1~12小时),后处理。处理方法为通常有机合成方法中该反应类型的常用方法:减压蒸馏,柱层析,或者低温重结晶。
实施例1:合成含对甲氧苄基保护的3-烯丙基苯酚衍生物和脱保护工艺
8的合成:在惰性气体保护下,将原料10mmol的6、11mmol的7,12mmol的NaOAc,0.1mmol的Pd(dppf)Cl2加入到10mL的无水二氧六环,在80℃溶液温度下搅拌反应8小时,TLC检测6完全转化,减压蒸馏除去溶剂,残留物加入10mL乙酸乙酯充分萃取产物,减压过滤不溶物。滤液用水洗涤3次,减压蒸馏,得到粗产品8直接用于下一步反应。MS(ESI):341[M+1]+
9的合成:在惰性气体保护下,将10mmol的8、11mmol的烯丙基溴、0.1mmol的Pd(PPh3)4,12mmol的Na2CO3溶解在含有10mL的含10%水的二氧六环中,在90℃溶液温度下搅拌反应6小时,TLC检测8完全转化。溶液减压蒸馏出去溶剂。残留物加入10mL乙酸乙酯充分萃取产物,减压过滤不溶物。滤液用水洗涤3次,减压蒸馏,得到粗产品9,粗产品经柱层析(300~400目硅胶,石油醚、乙酸乙酯为洗脱剂),得到9.3mmol的9,收率93%。1HNMR(400MHz,CDCl3):δ7.36(d,2H),7.33-7.35(m,1H),6.92(d,2H),6.81-6.83(m,3H),5.93-5.97(m,1H),5.06-5.11(m,2H),4.97(s,2H)3.82(s,3H),3.37(d,J=4.0Hz,2H)。MS(ESI):255[M+1]+。
的合成:在惰性气体保护下,将10mmol9溶解在含有10mL的10%的三氟乙酸的二氯甲烷溶液中,在25℃温度下搅拌反应2小时,检测9完全转化。将溶剂减压蒸馏,得到粗产品3,经柱层析(300~400目硅胶,石油醚、乙酸乙酯为洗脱剂),得到9.5mmol的3,收率95%。
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 (3)
1.一种新型含保护基的3-烯丙基苯酚衍生物的合成和脱保护的方法,其特征在于,合成路线为有机化学中适合于工业生产的反应路线,其反应式为:
其反应步骤为:(a)在惰性气体保护下,将原料6、7,NaOAc,Pd(dppf)Cl2溶解在惰性溶剂里,在50-130℃溶液温度下搅拌反应,检测6完全转化以后,减压蒸馏除去溶剂,残留物用难溶于水的惰性溶剂溶解,将不溶物过滤除去;用水洗涤滤液,浓缩得到8的粗产品,用有机化学中常用的纯化方法纯化(层析、重结晶、蒸馏)纯化或者直接用于下一步反应;
(b)在惰性气体保护下,将8、烯丙基溴、Pd(PPh3)4,Na2CO3溶解在含有10%水的二氧六环中,在60~120℃溶液温度下搅拌反应,检测6完全转化以后,后处理;纯化处理方法为将溶剂减压蒸馏,残留物用柱层析、减压蒸馏或者低温重结晶;
(c)在惰性气体保护下,将9溶解在含有酸的溶剂中,优选10%的三氟乙酸的二氯甲烷中,在0~80℃溶液温度下搅拌反应,检测9完全转化以后,后处理;将溶剂减压蒸馏,得到残留液体,通过减压蒸馏或者柱层析分离纯化得到产物。
2.根据权利要求1所述的一种新型含保护基的3-烯丙基苯酚衍生物的合成和脱保护的方法,其特征在于,所述的反应步骤(a)的反应为合成有机硼化合物,时间为0.5~24小时,6/7/NaOAc/Pd(dppf)Cl2的配方摩尔比为:1/(1~3)/(1~3)/(0.005~0.05)。
3.根据权利要求1所述的一种新型含保护基的3-烯丙基苯酚衍生物的合成和脱保护的方法,其特征在于,所述的反应步骤(b)和反应步骤(c)的反应时间为0.1~12小时。
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US3678122A (en) * | 1970-10-05 | 1972-07-18 | Universal Oil Prod Co | Allylation or benzylation of aromatic compounds |
WO2008135488A1 (en) * | 2007-05-04 | 2008-11-13 | Medivir Ab | Aspartyl protease inhibitors |
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