CN114133322A - 一种催化二硫缩醛/酮脱保护为羰基化合物的绿色方法 - Google Patents
一种催化二硫缩醛/酮脱保护为羰基化合物的绿色方法 Download PDFInfo
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Abstract
本发明提供了一种催化二硫缩醛/酮脱保护为羰基化合物的绿色方法,属于绿色有机合成领域。该方法以绿色溶剂乙醇作反应溶剂,在中性、敞口、室温条件下,由协同催化体系H2O2‑CeBr3原位生成次溴酸作为直接氧化剂,迅速将二硫缩醛/酮类化合物氧化为相应的羰基化合物。本发明所用溶剂乙醇绿色环保,试剂H2O2、CeBr3廉价易得,反应成本低,温和高效,底物适用范围广,产物收率高,操作简便,将进一步扩大二硫缩醛/酮类保护基团在现代有机合成中的应用,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,具体涉及一种催化二硫缩醛/酮脱保护为羰基化合物的绿色合成方法。
背景技术
在有机合成领域,特别是多步有机合成反应中,各种官能团的保护和去保护是一种常见的做法。在各种保护基团中,硫代缩醛/酮类化合物在天然产物的全合成中起着至关重要的作用,它们对羰基的脱保护,特别是在温和的反应条件下,一直是有机合成领域研究的热点。
目前,虽然已经开发了许多方法用于硫代缩醛/酮类化合物的脱保护,如使用Hg(II)、Zn(II)、Ag(I)、Ga(III)等重金属盐,或使用SeO2、(PhSeO)2O等有毒试剂,或使用NBS、高价碘试剂等,但这些方法都存在一些缺点,如试剂价格昂贵、反应时间长、官能团兼容性差、对环境不友好等,这些缺点严重限制了硫代缩醛/酮类保护基团在有机合成领域的应用。
因此,开发一种操作简便、温和高效且环境友好的硫代缩醛/酮类化合物脱保护为相应羰基化合物的方法意义重大。
发明内容
本发明的目的是,开发一种催化二硫缩醛/酮类化合物脱保护为相应羰基化合物的绿色合成方法。
本发明采用的技术方案为:
一种催化二硫缩醛/酮脱保护为羰基化合物的绿色方法:
在中性、敞口、室温条件下,以乙醇作反应溶剂,通过协同催化体系CeBr3-H2O2原位生成次溴酸作为直接氧化剂,短时间内完成二硫缩醛/酮类化合物转化为相应醛/酮类化合物的脱保护反应。
反应于溶剂中进行,所用溶剂为绿色溶剂乙醇。
反应在催化条件下进行,包括H2O2-CeBr3组成的协同催化体系,其中CeBr3也可替换为Ce(NO3)3-KBr、CeCl3-KBr、Ce(CF3SO3)3-KBr等Ce3+与Br-组成的金属盐组合。
反应底物为具有不同类型硫代缩醛/酮保护基的化合物,其中保护基团二硫缩醛/酮不仅可以是闭环化合物,如1,3-二硫杂环戊烷,也可以是开环化合物,如不同类型醛/酮类化合物分别与两分子2-巯基乙醇、4-甲基苯硫醇、苯甲硫醇以及2-巯基苯酚等反应形成的不同结构的硫代缩醛/酮保护基,反应底物具有的官能团可为氢基、烷基、烯基、炔基、芳基、酯基、脂环烃等不同官能团或呋喃、噻吩、吲哚、吡啶、吡咯以及其他杂环等不同取代基,可耐受常用保护基团如Bn、Ac、TBS、THP、Boc和TIPS等。
具体操作时,提供一种方案:将反应底物二硫缩醛/酮类化合物、CeBr3(0.01-0.1eq)依次加入装有适量乙醇的玻璃反应容器中,室温下搅拌均匀,然后加入H2O2水溶液(30wt%,1-2eq),反应混合物在室温下继续搅拌反应5-10min。TLC点板监测反应,反应完成后用稀释的Na2S2O3溶液(0.1M)淬灭和乙酸乙酯萃取。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:
本发明实现了在温和条件下由CeBr3-H2O2组成协同催化体系催化氧化二硫缩醛/酮类化合物脱保护为相应羰基化合物的可放大反应。与现有方法相比,本发明以绿色溶剂乙醇作反应溶剂,由协同催化体系CeBr3-H2O2原位生成次溴酸作为直接氧化剂进行脱保护反应,具有环境友好、试剂易得、成本低廉、反应温和高效、官能团耐受性好等特点,比之前所有的方法更具优势,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
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400MHz光谱仪上,1H为400MHz,13C为100MHz,光谱仪来自布鲁克公司。
实施例1
将乙醇40mL、1a(4mmol,0.92g)依次加入100mL圆底烧瓶中,搅拌均匀,然后向二者混合物中依次加入CeBr3(0.4mmol,0.152g),H2O2水溶液(30wt%,8mmol,0.82mL),在室温下搅拌反应10min。反应完成后用Na2S2O3溶液(0.1M,20mL)淬灭反应,用乙酸乙酯(100mL)萃取。收集有机相,水相用乙酸乙酯(2x 50mL)萃取。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:99%)。该化合物的表征数据如下:1H-NMR(400MHz,Chloroform-d)δ7.93-7.80(m,2H),7.48-7.32(m,2H),2.56(s,3H).13C-NMR(100MHz,Chloroform-d)δ196.8,139.6,135.5,129.8,128.9,26.6.IR 3066.7,3005.6,1682.3,1585.2,1485.8,1395.4,1356.5,1255.6,1092.3,1011.7,956.3,823.6,758.7cm-1;HRMS(ESI+)(m/z)calcd.for C8H8ClO[M+H]+155.0258;found 155.0254.
实施例2
将乙醇40mL、2a(4mmol,1.1g)依次加入100mL圆底烧瓶中,搅拌均匀,然后向二者混合物中依次加入CeBr3(0.4mmol,0.152g),H2O2水溶液(30wt%,8mmol,0.82mL),在室温下搅拌反应10min。反应完成后用Na2S2O3溶液(0.1M,20mL)淬灭反应,用乙酸乙酯(100mL)萃取。收集有机相,水相用乙酸乙酯(2x 50mL)萃取。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:90%)。该化合物的表征数据如下:1H-NMR(400MHz,Chloroform-d)δ7.89-7.71(m,2H),7.64-7.53(m,2H),2.57(s,3H).13C-NMR(100MHz,Chloroform-d)δ197.1,135.9,132.0,129.9,128.4,26.6.IR 1666.1,1576.2,1390.4,1350.7,1258.7,1171.7,1068.0,998.9,951.1,818.4,739.8cm-1;HRMS(ESI+)(m/z)calcd.for C8H8BrO[M+H]+198.9753;found 198.9742.
实施例3
将乙醇30mL、3a(3mmol,0.97g)依次加入100mL圆底烧瓶中,搅拌均匀,然后向二者混合物中依次加入CeBr3(0.3mmol,0.114g),H2O2水溶液(30wt%,6mmol,0.61mL),在室温下搅拌反应10min。反应完成后用Na2S2O3溶液(0.1M,15mL)淬灭反应,用乙酸乙酯(100mL)萃取。收集有机相,水相用乙酸乙酯(2x 50mL)萃取。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:92%)。该化合物的表征数据如下:1H-NMR(400MHz,Chloroform-d)δ7.88-7.76(m,2H),7.71-7.60(m,2H),2.56(s,3H).13C-NMR(100MHz,Chloroform-d)δ197.4,138.0,136.5,129.8,101.2,26.6.IR 3326.9,1668.1,1573.4,1417.8,1386.4,1354.0,1259.8,1171.5,996.3,951.3,813.5cm-1;HRMS(ESI+)(m/z)calcd.for C8H8IO[M+H]+246.9614;found 246.9611.
实施例4
将乙醇50mL、4a(5mmol,1.07g)依次加入100mL圆底烧瓶中,搅拌均匀,然后向二者混合物中依次加入CeBr3(0.5mmol,0.19g),H2O2水溶液(30wt%,10mmol,1.02mL),在室温下搅拌反应10min。反应完成后用Na2S2O3溶液(0.1M,25mL)淬灭反应,用乙酸乙酯(100mL)萃取。收集有机相,水相用乙酸乙酯(2x 50mL)萃取。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:77%)。该化合物的表征数据如下:1H-NMR(400MHz,Chloroform-d)δ8.02-7.91(m,2H),7.19-7.02(m,2H),2.58(s,3H).13C-NMR(100MHz,Chloroform-d)δ196.6,164.6(d,J=253Hz),133.7(d,J=3Hz),131.0(d,J=9Hz),115.7(d,J=21Hz),26.6.IR 3073.3,3006.7,1682.2,1594.3,1504.5,1408.4,1357.5,1261.7,1227.6,1155.1,958.2,835.0cm-1;HRMS(ESI+)(m/z)calcd.for C8H8FO[M+H]+139.0554;found 139.0549.
实施例5
将乙醇40mL、5a(4mmol,0.96g)依次加入100mL圆底烧瓶中,搅拌均匀,然后向二者混合物中依次加入CeBr3(0.4mmol,0.152g),H2O2水溶液(30wt%,8mmol,0.82mL),在室温下搅拌反应10min。反应完成后用Na2S2O3溶液(0.1M,20mL)淬灭反应,用乙酸乙酯(100mL)萃取。收集有机相,水相用乙酸乙酯(2x 50mL)萃取。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:94%)。该化合物的表征数据如下:1H-NMR(400MHz,Chloroform-d)δ10.10(s,1H),8.22-8.15(m,2H),8.00-7.91(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.IR2958.8,1720.7,1682.2,1572.2,1500.4,1432.6,1387.8,1276.6,1193.9,1102.3,1007.8,950.6,849.3,802.5,752.7cm-1;HRMS(ESI+)(m/z)calcd.for C9H9O3[M+H]+165.0546;found165.0542.
实施例6
将乙醇25mL、6a(2.5mmol,1g)依次加入100mL圆底烧瓶中,搅拌均匀,然后向二者混合物中依次加入CeBr3(0.25mmol,0.095g),H2O2水溶液(30wt%,5mmol,0.51mL),在室温下搅拌反应10min。反应完成后用Na2S2O3溶液(0.1M,12.5mL)淬灭反应,用乙酸乙酯(100mL)萃取。收集有机相,水相用乙酸乙酯(2x 50mL)萃取。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:94%)。该化合物的表征数据如下:1H-NMR(400MHz,Chloroform-d)δ10.06(s,1H),7.99-7.93(m,2H),7.79-7.73(m,2H),7.67-7.61(m,2H),7.52-7.45(m,2H),7.45-7.39(m,1H).13C-NMR(100MHz,Chloroform-d)δ192.0,147.3,139.8,135.3,130.4,129.1,128.6,127.8,127.5.IR 3025.1,2833.8,2742.7,1687.7,1598.2,1560.8,1382.7,1303.6,1213.0,1166.7,999.7,830.3,758.2,723.4,697.7cm-1;HRMS(ESI+)(m/z)calcd.for C13H11O[M+H]+183.0804;found 183.0810.
实施例7
将乙醇30mL、7a(3mmol,1.1g)依次加入100mL圆底烧瓶中,搅拌均匀,然后向二者混合物中依次加入CeBr3(0.3mmol,0.114g),H2O2水溶液(30wt%,6mmol,0.61mL),在室温下搅拌反应10min。反应完成后用Na2S2O3溶液(0.1M,15mL)淬灭反应,用乙酸乙酯(100mL)萃取。收集有机相,水相用乙酸乙酯(2x 50mL)萃取。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:97%)。该化合物的表征数据如下:1H-NMR(400MHz,Chloroform-d)δ9.88(s,1H),7.83(d,J=8.4Hz,2H),7.00(d,J=8.4Hz,2H),3.88(s,3H).13C-NMR(100MHz,Chloroform-d)δ190.9,164.7,132.1,130.1,114.4,55.7.IR3009.5,2966.0,2837.6,2738.7,1681.7,1596.0,1508.3,1460.3,1428.5,1311.2,1253.1,1213.5,1154.8,1021.2,827.1cm-1;HRMS(ESI+)(m/z)calcd.for C8H9O2[M+H]+137.0597;found 137.0597.
实施例8
将乙醇30mL、8a(3mmol,1.1g)依次加入100mL圆底烧瓶中,搅拌均匀,然后向二者混合物中依次加入CeBr3(0.3mmol,0.114g),H2O2水溶液(30wt%,6mmol,0.61mL),在室温下搅拌反应10min。反应完成后用Na2S2O3溶液(0.1M,15mL)淬灭反应,用乙酸乙酯(100mL)萃取。收集有机相,水相用乙酸乙酯(2x 50mL)萃取。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:75%)。该化合物的表征数据如下:1H-NMR(400MHz,Chloroform-d)δ7.75(d,J=7.7Hz,1H),7.60-7.54(m,1H),7.47(d,J=7.7Hz,1H),7.36(t,J=7.6Hz,1H),3.16-3.12(m,2H),2.70-2.66(m,2H).13C-NMR(100MHz,Chloroform-d)δ207.2,155.3,137.2,134.7,127.4,126.8,123.8,36.3,25.9.IR 3236.9,3049.6,2943.9,2893.5,1704.0,1601.8,1471.1,1439.6,1274.8,1195.5,1033.3,756.1cm-1;HRMS(ESI+)(m/z)calcd.for C9H9O[M+H]+133.0648;found 133.0644.
实施例9
将乙醇30mL、9a(3mmol,1.1g)依次加入100mL圆底烧瓶中,搅拌均匀,然后向二者混合物中依次加入CeBr3(0.3mmol,0.114g),H2O2水溶液(30wt%,6mmol,0.61mL),在室温下搅拌反应10min。反应完成后用Na2S2O3溶液(0.1M,15mL)淬灭反应,用乙酸乙酯(100mL)萃取。收集有机相,水相用乙酸乙酯(2x 50mL)萃取。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:90%)。该化合物的表征数据如下:1H-NMR(400MHz,Chloroform-d)δ10.77(s,1H),9.40(d,J=9.2Hz,1H),8.42(d,J=7.8Hz,1H),8.32-8.26(m,3H),8.22(dd,J=14.0,8.3Hz,2H),8.11-8.05(m,2H).13C-NMR(100 MHz,Chloroform-d)δ193.2,193.2,135.6,131.5,131.2,131.1,130.9,130.8,130.5,127.5,127.3,127.2,127.0,126.7,124.8,124.7,124.2,123.1.IR 2705.2,1675.1,1577.8,1498.3,1370.5,1174.1,1051.6,892.3,835.7,778.8,750.0,705.3 cm-1;HRMS(ESI+)(m/z)calcd.for C17H11O[M+H]+231.0804;found 231.0797.
Claims (9)
1.一种催化二硫缩醛/酮脱保护为羰基化合物的绿色方法,其特征在于,所述方法包括:在中性、敞口、室温条件下,以绿色溶剂乙醇作反应溶剂,以具有不同类型硫代缩醛/酮保护基的化合物为反应底物,其中保护基团二硫缩醛/酮不仅可以是环状化物,如1,3-二硫杂环戊烷,也可以是开链化合物,如不同类型醛/酮类化合物分别与两分子2-巯基乙醇、4-甲基苯硫醇、苯甲硫醇以及2-巯基苯酚等反应形成的R3为不同结构的硫代缩醛/酮保护基,R1、R2可为氢基、芳基、烯基、炔基、烷基、酯基、脂环烃等不同官能团或噻吩、呋喃、吲哚、吡啶、吡咯以及其他杂环等不同取代基,反应由协同催化体系H2O2-CeBr3原位生成次溴酸作为直接氧化剂,迅速地将二硫缩醛/酮类化合物催化氧化为相应的羰基化合物,可以耐受常用保护基团如Bn、Ac、TBS、THP、Boc和TIPS等。
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,所用溶剂为绿色溶剂乙醇,二硫缩醛/酮类化合物与溶剂乙醇的用量比例为1mmol/5-10mL。
3.根据权利要求1所述的方法,其特征在于:反应以H2O2-CeBr3组成协同催化体系,其中H2O2浓度为30%,H2O2与反应底物二硫缩醛/酮类化合物的摩尔比为1-2∶1;CeBr3与反应底物二硫缩醛/酮类化合物的摩尔比为0.01-0.1∶1,其中CeBr3也可替换为Ce(NO3)3-KBr、CeCl3-KBr、Ce(CF3SO3)3-KBr等Ce3+与Br-组成的金属盐组合。
4.根据权利要求1所述的方法,其特征在于:反应时间为5-10min即可。
5.根据权利要求1所述的方法,其特征在于:反应在pH为中性条件下即可进行。
6.根据权利要求1所述的方法,其特征在于:反应在不排除空气和水分的条件下进行,即敞口条件下进行。
7.根据权利要求1所述的方法,其特征在于:反应温度为室温。
8.根据权利要求1所述的方法,其特征在于:具体操作时,将二硫缩醛/酮类化合物、CeBr3依次加入装有适量乙醇的玻璃反应容器中,室温下搅拌均匀,然后加入H2O2水溶液,反应混合物在室温下继续搅拌反应5-10min,将二硫缩醛/酮类化合物催化氧化为相应的醛/酮类化合物。
9.根据权利要求1所述的方法,其特征在于:所述二硫缩醛/酮类化合物脱保护成相应醛/酮类化合物反应的后处理方法为,反应完成后用Na2S2O3溶液淬灭,乙酸乙酯萃取,收集有机相,水相再用有机溶剂萃取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,即可得相应的醛/酮类化合物。
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