7-溴-3,4-二氢-2H-1-萘酮的制备及其应用
发布日期:2022/9/8 10:38:40
基本描述
7-溴-3,4-二氢-2H-1-萘酮的CAS号是32281-97-3,分子式是C10H9BrO,以及分子量为225.08。熔点是78 °C,沸点是157°C/8mmHg(lit.),密度是1.511±0.06 g/cm3(Predicted),在乙醇中的紫外吸收波长为305nm。一般将其储存在2-8°C下。7-溴-3,4-二氢-2H-1-萘酮多合成不同种类的荧光探针被广泛应用到食品药品的检测当中[1]。
图1 7-溴-3,4-二氢-2H-1-萘酮的结构式。
合成
图2 7-溴-3,4-二氢-2H-1-萘酮的合成路线[2]。
乙醇(1 mmol)和新戊醇(2-4 mmol)的甲苯溶液(4 mL)通过玻璃柱(Omnifit®,6.6 mm i.d. × 100.0 mm长),并填充含水氧化锆(2.0 g,空隙体积2.0 mL),并在40°C加热。反应时间(流速)取决于底物的性质。在反应器后放置了一个100 psi的压力调节器。得到的溶液与蒸馏水相结合,通过通用相分离器得到的有机相在真空中浓缩。得到棕色固体产品7-溴-3,4-二氢-2H-1-萘酮。熔点75-79 °C; δH(400 MHz; CDCl3; 25 °C) 2.13 (2 H, q, J 6.2), 2.65 (2 H, t, J 6.2), 2.90 (2 H, t, J 6.2), 7.14 (1 H, d, J 8.6), 7.56 (1 H, d, J 8.6), 8.14 (1 H, s). δC(100 MHz; CDCl3; 25 °C) 22.96 (CH2), 29.15 (CH2), 36.76 (CH2), 120.64 (C), 129.99 (CH), 130.60 (CH), 134.06 (C), 136.09 (CH), 143.09 (C), 196.96 (C). FT-IR (neat, ν): 2949, 1676, 1585, 1404, 1259, 1221, 1190, 1065, 910, 824, 809 cm-1. LC-MS: retention time 4.79 min, m/z [M+H] = 224.99; HRMS (ESI): m/z calcd. for C10H10OBr+: 224.9905; found 224.9910.
图3 7-溴-3,4-二氢-2H-1-萘酮的合成路线[3]。
放入保持在0°C的圆底烧瓶中。,加入AlCl3(19.6g,146.8mmol),并将反应体系置于氮气下。在10分钟内加入8毫升四氢萘酮(8.62克,58.9毫摩尔),此时,将反应混合物在油浴中加热至90°C。在加入3.6ml Br2(11.2g、70.1mmol)之前保持约45分钟。将反应混合物在90°C下搅拌。在加入30ml冰水和20ml NaHCO3之前搅拌1小时。将产物用Et2O从水相中萃取两次,所得有机相用NaHCO3洗涤一次,用盐水洗涤一次并在Na2SO4下干燥。粗反应混合物通过快速色谱(2.5%EtOAc/97.5%hex)纯化,得到5.36g(23.8mmol)产物,产率为40%。7-溴-3,4-二氢-2H-1-萘酮,1H NMR(300MHz,CDCl3,δ)产率为40%:8.14(d,J=2.2,ArH,1H),7.56(dd,J=8.1,2.2,ArH,1 H),7.13(d,J=8.2,ArH,1H),2.90(t,J=6.1,CH2,2H),2.64(dd,J=5.7,5.5,CH2,2H),和2.12(td,J=12.7,6.4,CH2.2H)。DEP135NMR(75MHz,CDCl3):δ136.1(CH)、130.7(CH)、30.0(CH)、38.8(CH2)、29.2(CH2)和23.1(CH2)。EIMS:m/z(相对强度百分比)226(m++2100)、224(m+,100)、211(25)、209(25),198(75)、196(75),170(60)、168(60)、145(25)、115(45)、89(58)和63(28)。
图4 7-溴-3,4-二氢-2H-1-萘酮的合成路线[4]。
步:将4-(8-甲氧基萘-2-基)-2-甲基-1,2,3,4-四氢异喹啉马来酸盐(57 g,223mmol)、氢氧化钾(43 g,760mmol)和水合肼(26 m1,830mmol)在二甘醇(2865 ml)中的混合物在195°C下搅拌3小时。冷却至40℃以下后,将混合物用水(300ml)稀释,倒入3M NaOH中,并用二氯甲烷洗涤三次。加入盐水使乳液破碎。用6M HCl将水层酸化至pH 1,并用甲基叔丁基醚萃取三次。合并的有机提取物用硫酸镁干燥,得到4-(4-溴苯基)丁酸(41克,75%)。1H NMR(300 MHz,DMSO-d6)δ为7.44-7.48(m,2H),7.14-7.20(m,2H),2.56(t,J=7.2 Hz,2H)、2.20(t,J=7.5 Hz,2H)和1.72-1.82(m,2k)。
第二步:将上步产物(97g,397mmol)添加到多磷酸(580g)中,并将所得混合物在90°C下搅拌10分钟。冷却至0℃后,加入6M NaOH,并用甲基叔丁基醚萃取混合物。用硫酸镁干燥有机萃取物,得到7-溴-3,4-二氢萘-1-酮(49g,55%),色谱(6:1至4:1庚烷/乙酸乙酯)并从环己烷重结晶得到产物7-溴-3,4-二氢-2H-1-萘酮。1H NMR(300 MHz,DMSO-d6)δ7.91(d,J=2.1 Hz,1H),7.71(dd,J=8.1,2.1 Hz,1H)、7.34(d,J=8.1Hz,1H)、2.90(t,J=6.0Hz,2H)、2.61(t,J=6.3 Hz,2H)、1.99-2.07(m,2H)。
应用
7-溴-3,4-二氢-2H-1-萘酮是常见的双环芳香共轭结构,是许多化学和医药中间体的主要结构单元。在7-溴-3,4-二氢-2H-1-萘酮的双环结构上连接基团进行修饰,能够获得新型的荧光染料,与待测物反应后,在分子内形成电子推拉体系,发生荧光信号变化[5-6]。因此,7-溴-3,4-二氢-2H-1-萘酮对于荧光探针的构建具有重要的意义。用7-溴-3,4-二氢-2H-1-萘酮做成的荧光探针具有灵敏度高、响应时间短、选择性好、操作方便、非侵入性,能与荧光成像技术结合等优势,被广泛应用于食品、生物医学和环境等领域[7-9]。例如,筛选应用的高通量分析,医学和环境测量的光纤构造和目测分析物的检测等。此外,还可通过改变探针结构来调控激发和发射波长、靶标结合亲和力、化学反应活性和亚细胞定位[10-12]。
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