CN106243073B - 一种2-h苯并吡喃衍生物及其合成方法 - Google Patents
一种2-h苯并吡喃衍生物及其合成方法 Download PDFInfo
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- CN106243073B CN106243073B CN201610565962.0A CN201610565962A CN106243073B CN 106243073 B CN106243073 B CN 106243073B CN 201610565962 A CN201610565962 A CN 201610565962A CN 106243073 B CN106243073 B CN 106243073B
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- 150000002148 esters Chemical class 0.000 claims abstract description 7
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- 230000001590 oxidative effect Effects 0.000 claims abstract description 6
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Classifications
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D311/00—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only hetero atom, condensed with other rings
- C07D311/02—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only hetero atom, condensed with other rings ortho- or peri-condensed with carbocyclic rings or ring systems
- C07D311/04—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
本发明属于有机合成技术领域,公开了一种2‑H苯并吡喃衍生物及其合成方法。本发明所述2‑H苯并吡喃衍生物具有式(1)所示的结构式,其制备方法为:在反应器中,加入炔醚、烯酸酯及溶剂,加入钯盐催化剂和氧化剂,在20~150℃搅拌反应3~48小时,反应结束后冷却至室温,减压蒸除溶剂得粗产物,经柱层析提纯得到所述2‑H苯并吡喃衍生物。本发明的合成方法操作安全简单,原料容易得到、价格便宜,对功能团适应性好,对底物适应性广,环境友好,有利于工业生产,在农药、医药及天然产物合成中应用广泛。
Description
技术领域
本发明属于有机合成技术领域,具体涉及一种2-H苯并吡喃衍生物及其合成方法。
背景技术
随着社会经济的不断发展,全球化的环境污染和能耗问题日趋严重,在化学化工行业研究中,实现可持续发展已成为重要主题。如何发展环境友好的绿色合成新方法,实现资源的高效利用,是有机化学进展的其中一个主要方向。
苯并吡喃又称为色烯,有α-和γ-两个异构体,含苯并吡喃环结构的化合物具有多种生物活性和药理活性,报告显示该类物质具有抗菌、抗真菌、抗氧化和抗炎活性,此外它们还可作为认知增强剂,用于治疗神经退化性疾病,包括老年痴呆症、肌萎缩性脊髓侧索硬化症、亨廷顿氏病、帕金森病、唐氏综合症以及精神分裂症等(罗东辉.4H-苯并吡喃及天然产物Inulavosin的合成[D].哈尔滨工业大学.2015)。因此,这类化合物的合成引起了人们极大的兴趣。苯并吡喃是一种重要的天然产物骨架结构,不仅大量存在于陆地天然产物中,最新发现的很多海洋天然产物中也可以找到它们的身影,如Sargachromenols(Kusumi T.,Shibata Y.,Ishitsuka M.,et al.Chem.Lett.,1979,8(3):277),Tuberatolides(ChoiH.,Hwang H.,Chin J.,et al.J.Nat.Prod.2011,74(1):90),Fallachromenoic acids(Reddy P.,Sylvia U.Phytochemistry,2009,70(2):250)和Smenochromenes(YenmandraV.,Faulkner D.,J.Jorge L.R.S.,et al.J.Org.Chem.,1991,56(22):6271)。
同时,它们的某些衍生物却很重要,广泛地存在于自然界,并显示出重要的生物活性(Yao-Chang Xu,Elaine Lebeau,John W.Gillard,Giorgio Attardo.Xu Y M,Lebeau E,Gillard JW,etal.Tetrahedron Lett,1993,34,3841)。比如说,维生素E属于色烯的二氢化物——色满(chromen)的衍生物;印度学者研制的异色满并甾体化合物A可用于激素的研究;延边大学姜贵吉教授等合成的异色满曼尼西碱具有良好的降压作用B;而辛可芬类化台物C也表现出相当理想的抗炎作用(刘超,王朋,张朋,赵丽丽,王进军.2,4-二芳基吡啶并[4.3-C]异苯并-3,4-二氢-1H-吡喃的合成[J].烟台大学学报,2010,23(2),96)。
近年来,苯并吡喃的合成研究已经取得一定的进展,不停地有新的合成策略被提出。其中主要有(1)格式试剂法(Houben.Chem.Ber.,1904,37(1):489);(2)钌手性催化剂法(Sawant,K.B.;Jennings,M.P.J.Org.Chem.2006,71,7911;Miehaelis,S.;Blechert,S.Org.Lett.2005,7,5513;Roulland,E.;Ermolenko,M.S.Org.Lett.2005,7,2225)。而利用炔醚和烯酸酯为原料,在极少量钯盐的作用下,发生heck反应一步合成苯并吡喃衍生物的方法还没有报道。
发明内容
为了解决以上现有技术的缺点和不足之处,本发明的首要目的在于提供一种2-H苯并吡喃衍生物的合成方法。
本发明的另一目的在于提供一种通过上述方法合成得到的2-H苯并吡喃衍生物。
本发明目的通过以下技术方案实现:
一种2-H苯并吡喃衍生物的合成方法,包括以下步骤:
在反应器中,加入具有式(1)结构式的炔醚、式(2)结构式的烯酸酯及溶剂,加入钯盐催化剂和氧化剂,在20~150℃搅拌反应3~48小时,反应结束后冷却至室温,减压蒸除溶剂得粗产物,经柱层析提纯得到所述2-H苯并吡喃衍生物;
式中,R1为苯基(C6H5),对氟苯基(p-FC6H5),对甲苯基(p-CH3C6H5),对甲氧基苯基(p-OCH3C6H5)或乙基(C2H5);R2为甲基(CH3)、乙基(C2H5)、丁基(C4H9)、苯基(C6H5)、环己基(C6H11)或己基(C6H13)。
优选地,所述烯酸酯与炔醚的摩尔比为(0.2~5):1。
优选地,所述钯盐催化剂为三氟乙酸钯、氯化钯、醋酸钯、二氯二三苯基膦钯、钯碳、四三苯基膦钯、三(二亚苄基丙酮)二钯中一种以上;钯盐催化剂的加入量与炔醚的摩尔比为(0.02~1):1。
优选地,所述的溶剂为乙腈、四氢呋喃、甲苯、甲醇、醋酸、N,N-二甲基甲酰胺或1,4-二氧六环中的一种或两种以上的混合。
优选地,所述的氧化剂为氧化银、氧化铜、醋酸银、氯化铜、过硫酸钾、过硫酸钠、氧气中的一种;氧化剂的加入量与炔醚的摩尔比为(0.50~3):1。
优选地,所述炔醚与溶剂的摩尔体积比为0.5:(1~5)(mmol/mL)。
优选地,所述的柱层析是指以石油醚和乙酸乙酯的体积比为(1~100):1的混合溶剂为洗脱液的柱层析。
上述合成方法所涉及的反应如下式所示:
其中,R1为C6H5、p-FC6H5、p-CH3C6H5、p-OCH3C6H5或C2H5。
R2为CH3、C2H5、C4H9、C6H5、C6H11或C6H13。
一种2-H苯并吡喃衍生物,通过以上方法制备得到;所述2-H苯并吡喃衍生物具有下式所示的结构通式:
其中,R1为C6H5、p-FC6H5、p-CH3C6H5、p-OCH3C6H5或C2H5。
R2为CH3、C2H5、C4H9、C6H5、C6H11或C6H13。
本发明的合成方法具有如下优点及有益效果:
(1)本发明利用炔醚和烯酸酯为原料,在钯盐的催化作用下,发生heck反应一步合成2-H苯并吡喃衍生物,该合成方法操作安全简单,原料低毒、价格较低、容易得到,且对环境友好,具有良好的经济效益和环保效益;
(2)本发明2-H苯并吡喃衍生物的合成方法对功能团适应性好,对底物适应性广,具有良好的工业应用前景。
附图说明
图1和图2分别为实施例11所得2-H苯并吡喃衍生物的氢谱图和碳谱图;
图3和图4分别为实施例12所得2-H苯并吡喃衍生物的氢谱图和碳谱图;
图5和图6分别为实施例13所得2-H苯并吡喃衍生物的氢谱图和碳谱图;
图7和图8分别为实施例14所得2-H苯并吡喃衍生物的氢谱图和碳谱图;
图9和图10分别为实施例15所得2-H苯并吡喃衍生物的氢谱图和碳谱图;
图11和图12分别为实施例16所得2-H苯并吡喃衍生物的氢谱图和碳谱图。
具体实施方式
下面结合实施例及附图对本发明作进一步详细的描述,但本发明的实施方式不限于此。
实施例1
在螺口试管中加入0.25毫摩尔苯基对甲苯丙炔醚(制备方法:在封管里加入5毫摩尔苯基炔丙基醚、5毫摩尔对甲碘苯、0.25毫摩尔二氯二三苯基膦钯、0.5毫摩尔碘化亚铜、3毫升三乙胺,在室温下搅拌反应3小时后,停止搅拌。反应物料减压旋蒸去除溶剂,再通过柱层析分离纯化即得该原料,所用柱层析洗脱液为石油醚)(参考文献:V.S.Prasada RaoLingam.Tetrahedron Letters,2008,49(27),4260)、0.25毫摩尔丙烯酸乙酯、0.025毫摩尔氯化钯、0.25毫摩尔氧化银、2毫升乙腈,在80℃搅拌反应5小时后,停止加热及搅拌,冷却至室温。反应物料减压旋蒸去除溶剂,再通过柱层析分离纯化,得到2-H苯并吡喃衍生物,所用的柱层析洗脱液为体积比为3:1的石油醚:乙酸乙酯混合溶剂,产率85%。
实施例2
在螺口试管中加入0.25毫摩尔苯基对甲苯丙炔醚、0.40毫摩尔丙烯酸乙酯、0.020毫摩尔醋酸钯、0.50毫摩尔醋酸银、3毫升甲苯,在70℃搅拌反应6小时后,停止加热及搅拌,冷却至室温。反应物料减压旋蒸去除溶剂,再通过柱层析分离纯化,得到2-H苯并吡喃衍生物,所用的柱层析洗脱液为体积比为5:1的石油醚:乙酸乙酯混合溶剂,产率80%。
实施例3
在螺口试管中加入0.25毫摩尔苯基对甲苯丙炔醚、0.30毫摩尔丙烯酸乙酯、0.025毫摩尔钯碳、2毫升乙腈,套上氧气球,在90℃搅拌反应30小时后,停止加热及搅拌,冷却至室温。反应物料减压旋蒸去除溶剂,再通过柱层析分离纯化,得到2-H苯并吡喃衍生物,所用的柱层析洗脱液为体积比为1:1的石油醚:乙酸乙酯混合溶剂,产率81%。
实施例4
在螺口试管中加入0.25毫摩尔苯基对甲苯丙炔醚、0.35毫摩尔丙烯酸乙酯、0.050毫摩尔氯化钯、0.50毫摩尔氯化铜、2毫升甲苯,在120℃搅拌反应10小时后,停止加热及搅拌,冷却至室温。反应物料减压旋蒸去除溶剂,再通过柱层析分离纯化,得到2-H苯并吡喃衍生物,所用的柱层析洗脱液为体积比为15:1的石油醚:乙酸乙酯混合溶剂,产率86%。
实施例5
在螺口试管中加入0.25毫摩尔苯基对甲苯丙炔醚、0.80毫摩尔丙烯酸乙酯、0.030毫摩尔三氟乙酸钯、0.30毫摩尔过硫酸钾、2毫升N,N-二甲基甲酰胺,在80℃搅拌反应4小时后,停止加热及搅拌,冷却至室温。反应物料减压旋蒸去除溶剂,再通过柱层析分离纯化,得到2-H苯并吡喃衍生物,所用的柱层析洗脱液为体积比为1:1的石油醚:乙酸乙酯混合溶剂,产率81%。
实施例6
在螺口试管中加入0.25毫摩尔苯基对甲苯丙炔醚、0.35毫摩尔丙烯酸乙酯、0.050毫摩尔二氯二三苯基膦钯、0.050毫摩尔过硫酸钠,2毫升甲苯,在100℃搅拌反应6小时后,停止加热及搅拌,冷却至室温。反应物料减压旋蒸去除溶剂,再通过柱层析分离纯化,得到2-H苯并吡喃衍生物,所用的柱层析洗脱液为体积比为10:1的石油醚:乙酸乙酯混合溶剂,产率82%。
实施例7
在螺口试管中加入0.25毫摩尔苯基对甲苯丙炔醚、0.75毫摩尔丙烯酸乙酯、0.020毫摩尔醋酸钯、0.25毫摩尔氧化铜、2毫升乙腈,在90℃搅拌反应10小时后,停止加热及搅拌,冷却至室温。反应物料减压旋蒸去除溶剂,再通过柱层析分离纯化,得到2-H苯并吡喃衍生物,所用的柱层析洗脱液为体积比为6:1的石油醚:乙酸乙酯混合溶剂,产率78%。
实施例8
在螺口试管中加入0.25毫摩尔苯基对甲苯丙炔醚、0.55毫摩尔丙烯酸乙酯、0.075毫摩尔三(二亚苄基丙酮)二钯、0.45毫摩尔氧化银、2毫升甲苯,在50℃搅拌反应48小时后,停止加热及搅拌,冷却至室温。反应物料减压旋蒸去除溶剂,再通过柱层析分离纯化,得到2-H苯并吡喃衍生物,所用的柱层析洗脱液为体积比为8:1的石油醚:乙酸乙酯混合溶剂,产率84%。
实施例9
在螺口试管中加入0.25毫摩尔苯基对甲苯丙炔醚、0.40毫摩尔丙烯酸乙酯、0.025毫摩尔四三苯基膦钯、0.50毫摩尔醋酸银、2毫升醋酸,在140℃搅拌反应3小时后,停止加热及搅拌,冷却至室温。反应物料减压旋蒸去除溶剂,再通过柱层析分离纯化,得到2-H苯并吡喃衍生物,所用的柱层析洗脱液为体积比为2:1的石油醚:乙酸乙酯混合溶剂,产率80%。
实施例10
在螺口试管中加入0.25毫摩尔苯基对甲苯丙炔醚、0.65毫摩尔丙烯酸乙酯、0.035毫摩尔醋酸钯、2毫升甲苯,套上氧气球,在150℃搅拌反应24小时后,停止加热及搅拌,冷却至室温。反应物料减压旋蒸去除溶剂,再通过柱层析分离纯化,得到2-H苯并吡喃衍生物,所用的柱层析洗脱液为体积比为15:1的石油醚:乙酸乙酯混合溶剂,产率83%。
实施例11
在螺口试管中加入0.25毫摩尔苯基对甲苯丙炔醚、0.20毫丙烯酸乙酯、0.030毫摩尔氯化钯、0.50毫摩尔醋酸银、2毫升四氢呋喃,在60℃搅拌反应4小时后,停止加热及搅拌,冷却至室温。反应物料减压旋蒸去除溶剂,再通过柱层析分离纯化,得到2-H苯并吡喃衍生物,所用的柱层析洗脱液为体积比为5:1的石油醚:乙酸乙酯混合溶剂,产率79%。
本实施例所得2-H苯并吡喃衍生物的氢谱图和碳谱图分别如图1和图2所示,其结构表征数据如下:
IR(KBr,cm-1):3448,2920,1707,1610,1169,756;
1H NMR(400MHz,CDCl3)δ7.35(d,J=16.1Hz,1H),7.25(d,J=7.2Hz,2H),7.17(t,J=7.2Hz,1H),7.09(d,J=7.6Hz,2H),6.90(d,J=8.0Hz,1H),6.84–6.74(m,2H),5.79(d,J=16.1Hz,1H),5.01(s,2H),4.21–4.11(m,2H),2.40(d,J=10.5Hz,3H),1.24(t,J=7.1Hz,3H);
13C NMR(100MHz,CDCl3)δ166.91,154.73,141.39,139.99,138.11,131.86,130.42,130.00,129.14,127.78,124.27,124.03,121.41,117.08,115.89,77.32,77.00,76.68,65.37,60.29,21.24,14.18;
ESI-HRMS calcd for C21H20O3[M+Na]+343.1305;found,343.1305.
根据以上数据推断所得产物的结构式如下式所示:
实施例12
在螺口试管中加入0.25毫摩尔苯基苯丙炔醚(制备方法:在封管里加入5毫摩尔苯基炔丙基醚、5毫摩尔碘苯、0.25毫摩尔二氯二三苯基膦钯、0.5毫摩尔碘化亚铜、3毫升三乙胺,在室温下搅拌反应3小时后,停止搅拌。反应物料减压旋蒸去除溶剂,再通过柱层析分离纯化即得该原料,所用柱层析洗脱液为石油醚)(参考文献:V.S.Prasada RaoLingam.Tetrahedron Letters,2008,49(27),4260)、0.30毫摩尔丙烯酸乙酯、0.025毫摩尔二氯二三苯基膦钯、2毫升四氢呋喃,套上氧气球,在80℃搅拌反应36小时后,停止加热及搅拌,冷却至室温。反应物料减压旋蒸去除溶剂,再通过柱层析分离纯化,得到2-H苯并吡喃衍生物,所用的柱层析洗脱液为体积比为1:1的石油醚:乙酸乙酯混合溶剂,产率81%。
本实施例所得2-H苯并吡喃衍生物的氢谱图和碳谱图分别如图3和图4所示,其结构表征数据如下:
IR(KBr,cm-1):3447,2922,1625,1256,751;
1H NMR(400MHz,CDCl3)δ7.49–7.41(m,3H),7.31(d,J=16.1Hz,1H),7.19(ddd,J=13.9,7.6,1.8Hz,3H),6.95–6.88(m,1H),6.85–6.78(m,1H),6.74(dd,J=7.8,1.6Hz,1H),5.81(d,J=16.1Hz,1H),5.03(s,2H),4.15(q,J=7.1Hz,2H),1.31–1.17(m,3H);
13C NMR(100MHz,CDCl3)δ166.86,154.70,141.29,139.77,134.97,130.53,130.10,128.48,128.35,127.76,124.19,121.50,117.41,115.96,77.32,77.00,76.68,65.37,60.37,14.20;
ESI-HRMS calcd for C20H18O3[M+Na]+329.1148;found,329.1153.
根据以上数据推断所得产物的结构式如下式所示:
实施例13
在螺口试管中加入0.25毫摩尔苯基戊炔醚(制备方法:在敞口试管中加入5毫摩尔苯酚、5毫摩尔1-溴-2-戊炔、3毫升乙腈、在80℃搅拌反应4小时后,停止加热及搅拌,冷却至室温。反应物料减压旋蒸去除溶剂,再通过柱层析分离纯化即可得该原料,所用柱层析洗脱液为石油醚)(参考文献:Rafaela Gai.Tetrahedron,2014,20(24),3251)、0.80毫摩尔丙烯酸乙酯、0.045毫摩尔醋酸钯、0.60毫摩尔过硫酸钠、2毫升甲苯,在100℃搅拌反应8小时后,停止加热及搅拌,冷却至室温。反应物料减压旋蒸去除溶剂,再通过柱层析分离纯化,得到2-H苯并吡喃衍生物,所用的柱层析洗脱液为体积比为50:1的石油醚:乙酸乙酯混合溶剂,产率82%。
本实施例所得2-H苯并吡喃衍生物的氢谱图和碳谱图分别如图5和图6所示,其结构表征数据如下:
IR(KBr,cm-1):3450,2924,1634,1174,746;
1H NMR(400MHz,CDCl3)δ7.82(d,J=15.9Hz,1H),7.36(dd,J=7.8,1.3Hz,1H),7.23–7.17(m,1H),6.97(td,J=7.7,1.1Hz,1H),6.88(dd,J=8.1,1.0Hz,1H),5.81(d,J=15.9Hz,1H),4.84(s,2H),4.25(q,J=7.1Hz,2H),2.77(q,J=7.6Hz,2H),1.33(t,J=7.1Hz,3H),1.18(t,J=7.6Hz,3H).
13C NMR(100Hz,CDCl3)δ167.28,155.13,141.21,137.69,130.24,124.72,122.93,122.85,121.66,117.06,116.38,77.32,77.00,76.68,64.91,60.49,20.01,14.51,14.32.
ESI-HRMS calcd for C16H18O3[M+Na]+281.1148;found,281.1148.
根据以上数据推断所得产物的结构式如下式所示:
实施例14
在螺口试管中加入0.25毫摩尔苯基对甲苯丙炔醚、0.35毫摩尔丙烯酸甲酯、0.030毫摩尔钯碳、0.030毫摩尔醋酸银、2毫升1,4-二氧六环,在90℃搅拌反应48小时后,停止加热及搅拌,冷却至室温。反应物料减压旋蒸去除溶剂,再通过柱层析分离纯化,得到2-H苯并吡喃衍生物,所用的柱层析洗脱液为体积比为3:1的石油醚:乙酸乙酯混合溶剂,产率83%。
本实施例所得2-H苯并吡喃衍生物的氢谱图和碳谱图分别如图7和图8所示,其结构表征数据如下:
IR(KBr,cm-1):3445,2930,1704,1605,1172,745;
1H NMR(400MHz,CDCl3)δ7.34(d,J=16.1Hz,1H),7.25(d,J=2.9Hz,1H),7.21–7.15(m,1H),7.09(d,J=8.0Hz,2H),6.94–6.87(m,1H),6.84–6.75(m,2H),5.80(d,J=16.1Hz,1H),5.02(s,2H),3.70(s,3H),2.42(d,J=6.3Hz,3H).
13C NMR(100MHz,CDCl3)δ167.39,154.79,141.62,140.23,138.21,131.89,130.52,130.04,129.22,127.87,124.32,124.02,121.48,116.72,115.95,77.32,77.00,76.68,65.42,51.57,21.31.
ESI-HRMS calcd for C20H18O3[M+Na]+329.1148;found,329.1153.
根据以上数据推断所得产物的结构式如下式所示:
实施例15
在螺口试管中加入0.25毫摩尔苯基对甲苯丙炔醚、0.90毫摩尔丙烯酸丁酯、0.050毫摩尔四三苯基膦钯、0.80毫摩尔氧化铜、2毫升1,4-二氧六环,在60℃搅拌反应4小时后,停止加热及搅拌,冷却至室温。反应物料减压旋蒸去除溶剂,再通过柱层析分离纯化,得到2-H苯并吡喃衍生物,所用的柱层析洗脱液为体积比为1:1的石油醚:乙酸乙酯混合溶剂,产率84%。
本实施例所得2-H苯并吡喃衍生物的氢谱图和碳谱图分别如图9和图10所示,其结构表征数据如下:
IR(KBr,cm-1):3450,2923,1636,1267,745;
1H NMR(400MHz,CDCl3)δ7.34(d,J=16.1Hz,1H),7.28–7.23(m,2H),7.20–7.15(m,1H),7.09(d,J=7.9Hz,2H),6.90(d,J=8.1Hz,1H),6.84–6.77(m,2H),5.74(dd,J=37.3,14.2Hz,1H),5.02(s,2H),4.10(t,J=6.6Hz,2H),2.42(s,3H),1.63–1.55(m,2H),1.35(dq,J=14.6,7.4Hz,2H),0.91(t,J=7.4Hz,3H).
13C NMR(100MHz,CDCl3)δ167.04,154.76,141.43,140.07,138.14,131.90,130.45,130.03,129.15,127.82,124.29,124.09,121.45,117.08,115.93,77.32,77.00,76.68,65.40,64.24,30.66,21.27,19.13,13.68.
ESI-HRMS calcd for C23H24O3[M+Na]+371.1618;found,371.1625.
根据以上数据推断所得产物的结构式如下式所示:
实施例16
在螺口试管中加入0.25毫摩尔苯基对甲苯丙炔醚、0.35毫摩尔丙烯酸苯酯、0.050毫摩尔四三苯基膦钯、0.50毫摩尔过硫酸钾、2毫升乙腈,在50℃搅拌反应10小时后,停止加热及搅拌,冷却至室温。反应物料减压旋蒸去除溶剂,再通过柱层析分离纯化,得到2-H苯并吡喃衍生物,所用的柱层析洗脱液为体积比为25:1的石油醚:乙酸乙酯混合溶剂,产率86%。
本实施例所得2-H苯并吡喃衍生物的氢谱图和碳谱图分别如图11和图12所示,其结构表征数据如下:
IR(KBr,cm-1):3450,2922,1632,1135,745;
1H NMR(400MHz,CDCl3)δ7.51(d,J=16.1Hz,1H),7.35(t,J=7.8Hz,2H),7.25(d,J=4.0Hz,2H),7.23–7.18(m,2H),7.10(dd,J=14.2,7.9Hz,4H),6.93(d,J=8.1Hz,1H),6.83(q,J=7.6Hz,2H),6.02–5.96(m,1H),5.09(s,2H),2.42(d,J=9.7Hz,3H).
13C NMR(100MHz,CDCl3)δ165.43,154.94,150.77,142.65,141.92,138.38,131.73,130.80,130.03,129.42,129.29,129.22,128.06,125.64,124.24,123.94,121.55,116.03,77.32,77.00,76.68,65.40,21.28.
ESI-HRMS calcd for C25H20O3[M+Na]+391.1309;found,391.1309.
根据以上数据推断所得产物的结构式如下式所示:
上述实施例为本发明较佳的实施方式,但本发明的实施方式并不受上述实施例的限制,其它的任何未背离本发明的精神实质与原理下所作的改变、修饰、替代、组合、简化,均应为等效的置换方式,都包含在本发明的保护范围之内。
Claims (6)
1.一种2-H苯并吡喃衍生物的合成方法,其特征在于:所述2-H苯并吡喃衍生物具有下式所示的结构通式:
所述合成方法包括以下步骤:
在反应器中,加入具有式(1)结构式的炔醚、式(2)结构式的烯酸酯及溶剂,加入催化剂和氧化剂,在20~150℃搅拌反应3~48小时,反应结束后冷却至室温,减压蒸除溶剂得粗产物,经柱层析提纯得到所述2-H苯并吡喃衍生物;
式中,R1为苯基,对氟苯基,对甲苯基,对甲氧基苯基或乙基;R2为甲基、乙基、丁基、苯基、环己基或己基;
所述催化剂为三氟乙酸钯、氯化钯、醋酸钯、二氯二三苯基膦钯、钯碳、四三苯基膦钯、三(二亚苄基丙酮)二钯中的一种以上;所述的氧化剂为氧化银、氧化铜、醋酸银、氯化铜、过硫酸钾、过硫酸钠、氧气中的一种;所述的溶剂为乙腈、四氢呋喃、甲苯、甲醇、醋酸、N,N-二甲基甲酰胺或1,4-二氧六环中的一种或两种以上的混合。
2.根据权利要求1所述的一种2-H苯并吡喃衍生物的合成方法,其特征在于:所述烯酸酯与炔醚的摩尔比为(0.2~5):1。
3.根据权利要求1所述的一种2-H苯并吡喃衍生物的合成方法,其特征在于:所述钯盐催化剂的加入量与炔醚的摩尔比为(0.02~1):1。
4.根据权利要求1所述的一种2-H苯并吡喃衍生物的合成方法,其特征在于:所述氧化剂的加入量与炔醚的摩尔比为(0.50~3):1。
5.根据权利要求1所述的一种2-H苯并吡喃衍生物的合成方法,其特征在于:所述炔醚与溶剂的摩尔体积比为0.5:(1~5)mmol/mL。
6.根据权利要求1所述的一种2-H苯并吡喃衍生物的合成方法,其特征在于:所述的柱层析是指以石油醚和乙酸乙酯的体积比为(1~100):1的混合溶剂为洗脱液的柱层析。
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