CN114149297A - 一种微波辅助的选择性芳基甲醛的绿色合成方法 - Google Patents
一种微波辅助的选择性芳基甲醛的绿色合成方法 Download PDFInfo
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Abstract
本发明提供了一种微波辅助的选择性芳基甲醛的绿色合成方法。该方法在微波辅助条件下,以DMSO作为反应溶剂,以芳基甲醇化合物作为反应底物,以DMSO/Ac2O作为氧化剂,选择性的将芳基甲醇氧化成芳基甲醛。本发明在微波辅助条件下进行,反应时间10‑15min,极大的缩短了反应时间。本发明所用反应溶剂DMSO,直接参与了反应,减少了大量反应溶剂的使用,反应对环境友好、试剂易得、成本低、反应快,拓宽了芳基甲醇氧化成醛在有机合成中的应用,具有广阔的应用前景。
Description
技术领域
本发明属于有机合成技术领域,具体涉及一种微波辅助的选择性芳基甲醛的绿色合成方法。
背景技术
在有机合成领域,芳基甲醛是一种重要的合成中间体,被广泛应用于药物、香料、染料、树脂等多个行业。芳基甲醇化合物的选择性氧化是制备芳基甲醛化合物的重要方法。
目前,关于芳基甲醇氧化成芳基甲醛的方法有很多,例如可用过渡金属催化剂,包括铬(Cr)、铜(Cu)、钌(Ru)等,或使用次氯酸钠、N-氯代丁二酰亚胺(NCS)、间氯过氧苯甲酸(m-CPBA)等,但这些方法都存在着一些缺点,如很多过渡金属在地球上的存量有限,具有不可再生性。它们的使用不仅会加快不可再生资源的消耗,而且易造成重金属污染。此外,还存在着价格昂贵、反应时间长、后处理复杂、对环境不友好等诸多缺点。这些缺点严重限制了芳基甲醛的大量合成,限制了其广泛的应用。
因此,开发一种操作简便、反应迅速且环境友好的选择性氧化芳基甲醇成醛的方法意义重大。
发明内容
本发明的目的是开发一种选择性氧化芳基甲醇成醛的绿色合成方法。该法能够克服现有技术的缺点,以提高反应的选择性,并使反应在较短时间内完成,进而改进现有合成方法。
本发明采用的技术方案为:
一种微波辅助的选择性芳基甲醛的绿色合成方法:
反应于溶剂中进行,所用溶剂为DMSO。通过DMSO/Ac2O为氧化剂,在微波辅助条件下,短时间内将芳基甲醇选择性氧化成芳基甲醛。
反应以芳基甲醇化合物为原料,反应底物具有的官能团可为烷烃、烯烃、炔烃、脂环烃、酯基等不同官能团或呋喃、噻吩、吡啶、吡咯以及其他杂环等不同取代基。还包括萘甲醇,蒽甲醇等具有芳基甲醇结构的化合物。
具体操作时,提供一种方案:将反应底物、DMSO、Ac2O、AcOH依次加入到微波反应管中,在微波条件下,反应温度50-70℃,反应10-15min。反应后加入NaHCO3溶液,在室温下搅拌30min。用乙酸乙酯萃取,收集有机相,水相用乙酸乙酯萃取2-3次。合并有机相后依次用水洗,无水硫酸钠干燥,过滤,减压浓缩,即可得产物。
本发明的有益效果:
本发明与现有技术相比具有以下优点和效果:
本发明实现了将芳基甲醇选择性氧化成芳基甲醛的反应。与现有方法相比,本发明以DMSO为溶剂,以DMSO/Ac2O为氧化剂,通过微波辅助的方法,快速的实现了芳基甲醛的合成。具有环境友好、试剂易得、成本低、反应快、官能团耐受性好等特点。具有良好的应用前景。
附图说明
图1和图2是实施例1的1H-NMR及13C-NMR谱图
图3和图4是实施例2的1H-NMR及13C-NMR谱图
图5和图6是实施例3的1H-NMR及13C-NMR谱图
图7和图8是实施例4的1H-NMR及13C-NMR谱图
图9和图10是实施例5的1H-NMR及13C-NMR谱图
图11和图12是实施例6的1H-NMR及13C-NMR谱图
图13和图14是实施例7的1H-NMR及13C-NMR谱图
图15和图16是实施例8的1H-NMR及13C-NMR谱图
图17和图18是实施例9的1H-NMR及13C-NMR谱图
图19和图20是实施例10的1H-NMR及13C-NMR谱图
具体实施方式
下面用具体实施方案详述本发明,但本发明的保护范围不仅限于此。
以下实施例中的1H-NMR及13C-NMR谱均在室温条件下测定,记录在400 MHz光谱仪上,1H为400MHz,13C为100MHz,光谱仪来自布鲁克公司。
实施例1
将1a(0.82mmol,0.1g)、DMSO 2.5mL、Ac2O 1.76mL、AcOH 0.31mL依次加入到15mL微波反应管中,微波功率150w,加热温度60℃,反应时间10 min,冷却后加入NaHCO3溶液,在室温下搅拌30min。用乙酸乙酯萃取,收集有机相,水相用乙酸乙酯萃取2-3次。合并有机相后依次用水洗,无水硫酸钠干燥,过滤,减压浓缩,即可得目标产物1b(产率:62%)。该化合物的表征数据如下:1H-NMR(400MHz,Chloroform-d)δ9.95(s,1H),7.76(d,J=8.1Hz,2H),7.32 (d,J=7.9Hz,2H),2.43(s,3H).13C-NMR(100MHz,Chloroform-d)δ192.1,145.6,134.3,129.9,129.8,22.0.IR 2824.6,2733.2,1691.5,1602.8,1386.5,1301.7,1208.8,1109.2,1040.0,844.9cm-1;HRMS(ESI+)(m/z)calcd.for C8H9O[M+H]+121.0648; found121.0654.
实施例2
将2a(0.72mmol,0.1g)、DMSO 2.5mL、Ac2O 1.56mL、AcOH 0.28mL依次加入到15mL微波反应管中,微波功率150w,加热温度50℃,反应时间10 min,冷却后加入NaHCO3溶液,在室温下搅拌30min。用乙酸乙酯萃取,收集有机相,水相用乙酸乙酯萃取2-3次。合并有机相后依次用水洗,无水硫酸钠干燥,过滤,减压浓缩,即可得目标产物2b(产率:67%)。该化合物的表征数据如下:1H-NMR(400MHz,Chloroform-d)δ9.97(s,1H),7.47-7.43(m,2H),7.40-7.38 (m,1H),7.17(dt,J=6.4,2.7Hz,1H),3.86(s,3H).13C-NMR(100MHz, Chloroform-d)δ192.3,160.3,137.9,130.2,123.7,121.7,112.2,55.6.IR 2837.8, 2730.0,1697.0,1589.8,1482.7,1459.9,1389.1,1146.2,1038.2,778.5cm-1;HRMS (ESI+)(m/z)calcd.forC8H9O2[M+H]+137.0597;found 137.0601.
实施例3
将3a(0.79mmol,0.1g)、DMSO 2.5mL、Ac2O 1.70mL、AcOH 0.31mL依次加入到15mL微波反应管中,微波功率150w,加热温度60℃,反应时间10 min,冷却后加入NaHCO3溶液,在室温下搅拌30min。用乙酸乙酯萃取,收集有机相,水相用乙酸乙酯萃取2-3次。合并有机相后依次用水洗,无水硫酸钠干燥,过滤,减压浓缩,即可得目标产物3b(产率:61%)。该化合物的表征数据如下:1H-NMR(400MHz,Chloroform-d)δ10.33(s,1H),7.84(td,J=7.4,1.9Hz,1H), 7.64-7.57(m,1H),7.29-7.23(m,1H),7.19-7.12(m,1H).13C-NMR(100MHz,Chloroform-d)δ186.8(d,J=6Hz),163.2(d,J=257Hz),136.2(d,J=9Hz),128.5 (d,J=2Hz),124.5(d,J=3Hz),124.0(d,J=8Hz),116.2(d,J=20Hz).IR 1693.7, 1609.6,1583.1,1481.5,1457.5,1400.5,1273.1,1188.0,1095.9,758.7cm-1;HRMS (ESI+)(m/z)calcd.for C7H6FO[M+H]+125.0397;found 125.0398.
实施例4
将4a(0.54mmol,0.1g)、DMSO 1.65mL、Ac2O 1.16mL、AcOH 0.21mL 依次加入到15mL微波反应管中在,微波功率150w,加热温度50℃,反应时间15min,冷却后加入NaHCO3溶液,在室温下搅拌30min。用乙酸乙酯萃取,收集有机相,水相用乙酸乙酯萃取2-3次。合并有机相后依次用水洗,无水硫酸钠干燥,过滤,减压浓缩,即可得目标产物4b(产率:69%)。该化合物的表征数据如下:1H-NMR(400MHz,Chloroform-d)δ9.97(s,1H),7.76-7.71(m,2H),7.70-7.65(m,2H).13C-NMR(100MHz,Chloroform-d)δ191.2,135.2,132.6,131.1, 129.9.IR1685.5,1576.3,1473.0,1379.3,1198.1,1147.2,1058.3,806.8cm-1;HRMS (ESI+)(m/z)calcd.for C7H6BrO[M+H]+184.9597;found 184.9590.
实施例5
将5a(0.56mmol,0.1g)、DMSO 1.55mL、Ac2O 1.22mL、AcOH 0.22mL 依次加入到15mL微波反应管中在,微波功率150w,加热温度60℃,反应时间10min,冷却后加入NaHCO3溶液,在室温下搅拌30min。用乙酸乙酯萃取,收集有机相,水相用乙酸乙酯萃取2-3次。合并有机相后依次用水洗,无水硫酸钠干燥,过滤,减压浓缩,即可得目标产物5b(产率:65%)。该化合物的表征数据如下:1H-NMR(400MHz,Chloroform-d)δ10.38(s,1H),7.84(d,J=8.4Hz,1H), 7.44(s,1H),7.34(d,J=8.4Hz,1H).13C-NMR(100MHz,Chloroform-d)δ188.5, 141.2,138.6,131.0,130.5,130.4,128.0.IR 3081.5,2884.8,2639.7,1683.1,1576.9, 1461.3,1412.3,1248.9,1043.4,820.6cm-1;HRMS(ESI+)(m/z)calcd.for C7H5Cl2O [M+H]+174.9712;found 174.9719.
实施例6
将6a(0.63mmol,0.1g)、DMSO 1.95mL、Ac2O 1.36mL、AcOH 0.24mL 依次加入到15mL微波反应管中在,微波功率150w,加热温度70℃,反应时间10min,冷却后加入NaHCO3溶液,在室温下搅拌30min。用乙酸乙酯萃取,收集有机相,水相用乙酸乙酯萃取2-3次。合并有机相后依次用水洗,无水硫酸钠干燥,过滤,减压浓缩,即可得目标产物6b(产率:58%)。该化合物的表征数据如下:1H-NMR(400MHz,Chloroform-d)δ10.13(s,1H),8.28(s,1H),7.99-7.84 (m,4H),7.65-7.53(m,2H).13C-NMR(100MHz,Chloroform-d)δ192.2,136.4, 134.6,134.1,132.6,129.5,129.1,129.1,128.1,127.1,122.8.IR 2825.3,1683.0, 1458.0,1339.6,1158.4,870.0,745.2cm-1;HRMS(ESI+)(m/z)calcd.for C11H9O [M+H]+157.0648;found 157.0646.
实施例7
将7a(0.67mmol,0.1g)、DMSO 2.05mL、Ac2O 1.43mL、AcOH 0.26mL 依次加入到15mL微波反应管中在,微波功率150w,加热温度60℃,反应时间15min,冷却后加入NaHCO3溶液,在室温下搅拌30min。用乙酸乙酯萃取,收集有机相,水相用乙酸乙酯萃取2-3次。合并有机相后依次用水洗,无水硫酸钠干燥,过滤,减压浓缩,即可得目标产物7b(产率:65%)。该化合物的表征数据如下:1H-NMR(400MHz,Chloroform-d)δ9.80(s,1H),7.73-7.70(m,1H),7.66-7.62(m,1H),6.85(d,J=8.3Hz,1H),4.66(t,J=8.8Hz,2H),3.24(t,J=8.8 Hz,2H).13C-NMR(100MHz,Chloroform-d)δ190.7,165.7,133.1,130.5,128.5, 126.0,109.7,72.5,28.8.IR 2906.3,2833.3,2742.8,1677.6,1596.9,1486.1,1441.2, 1327.5,1239.7,1091.9,816.4cm-1;HRMS(ESI+)(m/z)calcd.for C9H9O2[M+H]+ 149.0597;found 149.0592.
实施例8
将8a(0.61mmol,0.1g)、DMSO 1.90mL、Ac2O 1.31mL、AcOH 0.23mL 依次加入到15mL微波反应管中在,微波功率150w,加热温度60℃,反应时间10min,冷却后加入NaHCO3溶液,在室温下搅拌30min。用乙酸乙酯萃取,收集有机相,水相用乙酸乙酯萃取2-3次。合并有机相后依次用水洗,无水硫酸钠干燥,过滤,减压浓缩,即可得目标产物8b(产率:71%)。该化合物的表征数据如下:1H-NMR(400MHz,Chloroform-d)δ9.98(s,1H),7.82(d,J=8.3Hz,2H), 7.55(d,J=8.2Hz,2H),1.36(s,9H).13C-NMR(100MHz,Chloroform-d)δ192.2, 158.6,134.2,129.8,126.1,35.5,31.2.IR 2906.5,2870.8,2823.3,2726.9,1697.1,1604.4,1467.6,1414.1,1368.9,1217.2,1105.6,825.9cm-1;HRMS(ESI+)(m/z) calcd.for C11H15O[M+H]+163.1117;found 163.1112.
实施例9
将9a(0.48mmol,0.1g)、DMSO 1.50mL、Ac2O 1.04mL、AcOH 0.18mL 依次加入到15mL微波反应管中在,微波功率150w,加热温度60℃,反应时间10min,冷却后加入NaHCO3溶液,在室温下搅拌30min。用乙酸乙酯萃取,收集有机相,水相用乙酸乙酯萃取2-3次。合并有机相后依次用水洗,无水硫酸钠干燥,过滤,减压浓缩,即可得目标产物9b(产率:68%)。该化合物的表征数据如下:1H-NMR(400MHz,Chloroform-d)δ11.53(s,1H),8.99(dd,J=9.0,1.0Hz, 2H),8.70(s,1H),8.07(d,J=8.4Hz,2H),7.71-7.66(m,2H),7.58-7.53(m,2H).13C-NMR(100MHz,Chloroform-d)δ193.2,135.4,132.3,131.2,129.4,129.3, 125.8,124.9,123.7.IR 1659.8,1547.3,1515.4,1437.8,1242.5,1155.0,1041.6, 843.8,723.7cm-1;HRMS(ESI+)(m/z)calcd.for C15H11O[M+H]+207.0804;found 207.0808.
实施例10
将10a(0.60mmol,0.1g)、DMSO 1.85mL、Ac2O 1.30mL、AcOH 0.23mL 依次加入到15mL微波反应管中在,微波功率150w,加热温度60℃,反应时间10min,冷却后加入NaHCO3溶液,在室温下搅拌30min。用乙酸乙酯萃取,收集有机相,水相用乙酸乙酯萃取2-3次。合并有机相后依次用水洗,无水硫酸钠干燥,过滤,减压浓缩,即可得目标产物10b(产率:64%)。该化合物的表征数据如下:1H-NMR(400MHz,Chloroform-d)δ10.10(s,1H),8.21-8.17(m,2H),7.97-7.93(m,2H),3.96(s,3H).13C-NMR(100MHz,Chloroform-d)δ191.8,166.2, 139.3,135.2,130.3,129.6,52.7.IR 1720.7,1682.2,1572.2,1500.4,1432.6,1387.8, 1193.9,1102.3,1007.8,849.3cm-1;HRMS(ESI+)(m/z)calcd.for C9H9O3[M+H]+ 165.0546;found165.0542.
Claims (9)
2.根据权利要求1所述的方法,其特征在于:反应于溶剂中进行,所用溶剂为DMSO,芳基甲醇化合物与溶剂DMSO的用量比例为1mmol/3-5mL。
3.根据权利要求1所述的方法,其特征在于:反应在微波辅助下进行。
4.根据权利要求1所述的方法,其特征在于:反应时间为10-15min。
5.根据权利要求1所述的方法,其特征在于:微波时间为150w。
6.根据权利要求1所述的方法,其特征在于:反应温度为50-70℃。
7.根据权利要求1所述的方法,其特征在于:反应以DMSO/Ac2O为氧化剂,DMSO与Ac2O的比例为1.4-1.5∶1。
8.根据权利要求1所述的方法,其特征在于:具体操作时,将反应底物、DMSO、Ac2O、AcOH依次加入到微波反应管中,在微波条件下,微波功率150w,反应温度50-70℃,反应10-15min。
9.根据权利要求1所述的方法,其特征在于:所述微波辅助的选择性氧化芳基甲醇成醛的后处理方法为,反应后加入NaHCO3溶液,在室温下搅拌30min。用乙酸乙酯萃取,收集有机相,水相用乙酸乙酯萃取2-3次。合并有机相后依次用水洗,无水硫酸钠干燥,过滤,减压浓缩,即可得产物。
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