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1、橙皮素的18个新席夫碱化合物制备及其结构表征研究,应用化学论文橙皮苷和橙皮素是柑橘类果皮的主要药效成分。近年的研究表示清楚,二者在抗氧化和去除自由基、调节心血管系统功能、保卫神经系统、抗过敏、抗皮炎、抗菌抗癌及基因毒性等方面表现出较好的生物活性。席夫碱指由含有活泼羰基的化合物与含氨基的化合物通过缩水构成的含碳氮双键的亚氨基(RHCRN)R或烷亚氨基(RRCRN)R类有机化合物。席夫碱中RCRNR双键上的RNR原子有孤对电子,具有重要的化学与生物学意义,近年来,对其在抗肿瘤、抗氧化和抗菌活性研究方面获得了很大进展。 自由基是生物体生命活动经过中由机体生物化学反响所产生的中间产物,对机体的衰老和疾
2、病、正常的免疫代谢和细胞信号传导等经过均起着重要作用。研究发现生物体的多种疾病均与自由基对机体的氧化损伤有关。因而,开发能够去除自由基的抗氧化剂成为医药生物学研究的热门。 本文从中药陈皮中提取橙皮苷,酸水解制备橙皮素,然后分别与苯肼类、苯甲酰肼类、苯氨基脲类、苯氨基硫脲类、苯乙酰肼类、苯氧乙酰肼类和苯氨基乙酰肼类等含氨基化合物缩合反响得到橙皮素的18R个新席夫碱化合物,根据RUV、IR、1HRNMR、MSR图谱及元素分析对目的化合物的构造进行了表征,比拟了橙皮苷、橙皮素和橙皮素席夫碱去除超氧自由基(RO 2)R、羟自由基( OH)R和(RDPPH )R自由基的活性并测定了它们的总复原能力,为以
3、橙皮黄酮为原料的新生物活性药物的开发和应用提供了实验数据。 1、R实验部分 1R1R仪器和试剂 X-4R型显微熔点测定仪(R北京泰克公司)R,温度计未校正;RUV-2550R型紫外可见分光光度计(R日本岛津公司)R;RVarioRELRcubeR型元素分析仪(R德国RElementarR公司)R;RFT-IRR6700R型红外光谱仪(R美国RNicoletR公司)R,KBrR压片;RAvanceRAVR400MHzR超导核磁共振仪(R德国RBrukerR公司)R,溶剂为RDMSO-d6;RDSQR型质谱仪(R美国RThermoR公司)R。陈皮购自本地市场;R硅胶为青岛海洋化工厂生产;R二苯代苦
4、味肼基自由基DPPH 为RSigmaR产品;R苯肼类、苯甲酰肼类、苯氨基脲类、苯氨基硫脲类、苯乙酰肼类、苯氧乙酰肼类和苯氨基乙酰肼类化合物均为自制;R其余试剂为国产化学纯或分析纯。 1R2R橙皮素席夫碱衍生物的制备 橙皮苷的提取和分离纯化以下为参考文献方式方法进行。所得橙皮苷为白色片状结晶,产率为R1.R3%,mp为R260R262R,微溶于甲醇、乙醇,易溶于二甲亚砜、N,N-二甲基甲酰胺,其盐酸-镁粉实验为红色,1%AlCl3实验为黄色,10%KOHR实验为黄色。 橙皮素的制备以下为参考文献方式方法进行。所得橙皮素为淡黄色针状结晶,产率为R52.R1%,mpR为R224R226RR,不溶于石
5、油醚,易溶于甲醇、乙醇,盐酸-镁粉实验为红色,1%RAlCl3实验为黄色,10%RKOHR实验为黄色。 橙皮素席夫碱衍生物的制备:R将R1RmmolR橙皮素和R1.R1RmmolR含氨基化合物溶于R20RmLR无水乙醇中并滴加少量冰醋酸或R1R滴浓盐酸,混合液搅拌回流R24R60Rh,薄层层析检测反响进程,得棕黄色溶液,减压除去部分乙醇,有黄色固体析出,抽滤,蒸馏水洗涤固体,再用少量乙醇洗涤,室温晾干,无水乙醇/二甲亚砜重结晶,得到相应的橙皮素席夫碱类化合物。合成道路如RSchemeR1R所示。 1R3R去除自由基活性实验 橙皮苷、橙皮素及其席夫碱类衍生物去除自由基活性试验以下为参考文献方式方
6、法进行,华而不实羟自由基由RFe2R+-H2O2-亚甲蓝体系产生,超氧自由基采用碱性条件下邻苯三酚的自氧化产生,DPPH 自由基直接用无水乙醇配制使用,复原能力测定采用铁氰化钾复原法。试样为浓度R1.R0Rg/LR的二甲亚砜溶液。 2、R结果与讨论 2R1R橙皮素席夫碱衍生物的构造表征橙皮素对氯苯腙(R1a)R:R棕黄色粉末,产率R19.R7%,mpR232RR234R,不溶于石油醚,易溶于甲醇、乙醇,盐酸-镁粉实验为红色,1%AlCl3实验为黄褐色,10%KOHR实验为黄褐色。UV(RDMSO)R, max/Rnm:R339,297;REI-MS(RmR/Rz,%R)R:R426(RM+,3
7、.R36)R,411(R3.R12)R,300(R4.R25)R,179(R33.R17)R,137(R100)R,107(R19.R12)R,77(R24.R03)R;1HRNMR(RDMSO-d6)R, :R2.R72(Rdd,JR=R2.R80,17.R10RHz,1H,3-HRcis)R,3.R04(Rdd,JR=R12.R70,17.R09Hz,1H,3-HRtrans)R,3.R86(Rs,3H,4 -OCH3)R,5.R29(Rdd,JR=R2.R72,12.R52RHz,1H,2-H)R,5.R61(Rs,1H,3 -OH)R,5.R90(Rs,2H,6,8-H)R,6.R89
8、RR6.R95(Rm,3H,2 ,5 ,6 -H)R,7.R22R(Rd,JR=R8.R77RHz,2H,2 ,6 -H)R,7.R57R(Rd,JR=8.R81RHz,2H,3 ,5 -H)R,9.R38R(Rs,1H,7-OH)R,10.R05R(Rs,1H, NH)R,12.R05R(Rs,1H,5-OH)R;RIRR(RKBr)R, R/cmR1:3497、3446(ROH)R,3326(RNH)R,2915,1608(RCRN)R,1587,1539,1515,1445;RC22H19ClN2O5元素分析(R计算值)R/%:RCR60.R03(R61.R90)R,HR4.R59(R4
9、.R46)R,NR6.R71(R6.R57)R。 橙皮素对氯苯甲酰腙(R2a)R:R棕黄色粉末,产率R37.R8%,mpR246RR248R,不溶于石油醚,易溶于甲醇、乙醇,盐酸-镁粉实验为红色,1%RAlCl3实验为黄褐色,10%RKOHR试验为黄褐色。UV(RDMSO)R, max/Rnm:R351,307;REI-MS(RmR/Rz,%R)R:R454(RM+,3.R04)R,436(R23.R45)R,297(R69.R16)R,185(R23.R79)R,139(R100)R,111(R32.R19)R,77(R9.R45)R;1HRNMR(RDMSO-d6)R, :R2.R77(R
10、dd,JR=2.R90,17.R08RHz,1H,3-HRcis)R,3.R07(Rdd,JR=12.R71,17.R09RHz,1H,3-HRtrans)R,3.R70R(Rs,3H,4 -OCH3)R,5.R32(Rdd,JR=R2.R75,12.R52RHz,1H,2-H)R,5.R64(Rs,1H,3 -OH)R,5.R89(Rs,2H,6,8-H)R,6.R92RR7.R05(Rm,3H,2 ,5 ,6 -H)R,7.R24(Rd,JR=R8.R82RHz,2H,2 ,6 -H)R,7.R59(Rd,JR=R8.R86RHz,2H,3 ,5 -H)R,9.R40(Rs,1H,7-OH
11、)R,10.R25(Rs,1H, NH)R,12.R05(Rs,1H,5-OH)R;IR(RKBr)R, R/RcmR1:R3495、3450(ROH)R,3331(RNH)R,2925,1610(RCRN)R,1543,1520,1465;RC23H19ClN2O6元素分析(R计算值)R/%:RCR59.R93(R60.R73)R,HR4.R39(R4.R18)R,NR6.R71(R6.R16)R。 橙皮素对羟基苯甲酰腙(R2b)R:R淡黄色粉末,产率42.R66%,mpR300R。 1HRNMR(RDMSO-d6)R, :R2.R96(Rdd,JR=R5.R08,12.R16RHz,1H,
12、3-HRcis)R,3.R42(Rdd,JR=R12.R04,17.R28RHz,1H,3-HRtrans)R,3.R78(Rs,3H,4 -OCH3)R,5.R10(Rdd,JR=R2.R68,9.R24RHz,1H,2-H)R,5.R64(Rs,1H,3 -OH)R,5.R90(Rs,1H,6-H)R,5.R93(Rs,1H,Ph OH)R,5.R97R(Rs,1H,8-H)R,6.R84RR7.R82R(Rm,7H,Ph H)R,9.R42R(Rs,1H,7-OH)R,10.R99R(Rs,1H, NH)R,13.R11(Rs,1H,5-OHR)R;RIRR(RKBrR)R, R/Rcm
13、R1:R3508R(ROH)R,3339R(RNH)R,2939,2843,1654R(RCRO)R,1606(RCRN)R,1503,1480,1270,1173,1077,838。 橙皮素对硝基苯甲酰腙(R2c)R:R黄色粉末,产率R15.R05%,mpR300R。 1HRNMR(RDMSO-d6)R, :R3.R07(Rdd,JR=R5.R24,11.R88RHz,1H,3-HRcis)R,3.R45(Rdd,JR=R12.R02,17.R32RHz,1H,3-HRtrans)R,3.R79(Rs,3H,4 -OCH3)R,5.R19(Rdd,JR=R2.R84,8.R94RHz,1H,
14、2-H)R,5.R69(Rs,1H,3 -OH)R,5.R91(Rs,1H,6-H)R,5.R93(Rs,1H,8-H)R,6.R86RR7.R41R(Rm,7H,Ph H)R,9.R07R(Rs,1H,7-OH)R,10.R26R(Rs,1H, NH)R,12.R87R(Rs,1H,5-OH)R;RIR(RKBr)R, /cmR1:R3378(ROH)R,3299(RNH)R,2938,2845,2641,1629(RCRO)R,1596(RCRN)R,1516,1461,1275,1156,1078,1023,835。 橙皮素间甲基苯甲酰腙(R2d)R:R黄色粉末,产率R15.R21%,m
15、pRR300R。 1HRNMR(RDMSO-d6)R, :R1.R07(Rs,3H,-CH3)R,3.R07(Rdd,JR=5.R24,11.R88RHz,1H,3-HRcis)R,3.R46(Rdd,JR=12.R70,17.R12RHz,1H,3-HRtrans)R,3.R79(Rs,3H,4 -OCH3)R,5.R19(Rdd,JR=R2.R80,8.R8RHz,1H,2-H)R,5.R68(Rs,1H,3 -OH)R,5.R90(Rs,1H,6-H)R,5.R91(Rs,1H,8-H)R,6.R86RR7.R35(Rm,7H,Ph H)R,9.R12(Rs,1H,7-OH)R,10.R
16、24(Rs,1H, NH)R,12.R87(Rs,1H,5-OH)R;RIRR(RKBr)R, R/RcmR1:R3300(ROH)R,3287(RNH)R,2961,2936,2841,1635(RCRO)R,1597(RCRNRN)R,1515,1462,1278,1157,1080,1019,813。 橙皮素苯氨基脲腙(R3a)R:R黄色粉末,产率R19.R77%,mpRR300R。 1HRNMR(RDMSO-d6)R, :R3.R07(Rdd,JR=R4.R44,12.R32RHz,1H,3-HRcis)R,3.R30(Rdd,JR=R12.R71,17.R10RHz,1H,3-HRt
17、rans)R,3.R79(Rs,3H,4 -OCH3)R,5.R19(Rdd,JR=R2.R83,8.R90RHz,1H,2-H)R,5.R62(Rs,1H,3 -OH)R,5.R91(Rs,2H,6-H,8-H)R,6.R87RR7.R50(Rm,8H,Ph H)R,8.R76(Rs,1H, NH)R,9.R12(Rs,1H,7-OH)R,10.R24(Rs,1H, NH)R,12.R87(Rs,1H,5-OH)R;RIR(RKBr)R, R/cmR1:R3405(ROH)R,3231(RNH)R,2956,2834,1858,1662(RCRO)R,1595(RCRN)R,1533,151
18、6,1441,1386,1279,1156,1088,1028,823。 橙皮素对甲基苯氨基脲腙(R3b)R:R黄色粉末,产率16.R84%,mpR300R。 1HRNMR(RDMSO-d6)R, :R1.R12(Rs,3H, CH3)R,3.R07(Rdd,JR=R3.R45,12.R52RHz,1H,3-HRcis)R,3.R30(Rdd,JR=R12.R69,17.R08RHz,1H,3-Htrans)R,3.R79(Rs,3H,4 -OCH3)R,5.R19(Rdd,JR=2.R91,9.R06RHz,1H,2-H)R,5.R71(Rs,1H,3 -OH)R,5.R91(Rs,2H,6
19、-H,8-H)R,6.R86RR7.R37R(Rm,7H,Ph H)R,8.R64R(Rs,1H, NH)R,9.R10R(Rs,1H,7-OH)R,10.R24R(Rs,1H, NH)R,12.R87(Rs,1H,5-OHR)R;RIRR(RKBrR)R, R/RcmR1:R3409R(ROH)R,3298、3225R(RNH)R,2917,1670R(RCRO)R,1600(RCRN)R,1551,1516,1451,1332,1243,822。 橙皮素对氯苯氨基脲腙(R3c)R:R黄色粉末,产率R21.R73%,mpRR300R。EI-MS(Rm/z,%)R:R469(RM+,0.R36
20、)R,211R(R7.R02R)R,185R(R14.R35R)R,153R(R100R)R,127R(R54.R32R)R,111R(R13.R12R)R,99R(R19.R88R)R,90R(R47.R31R)R,75(R17.R23)R,63(R32.R15)R,55(R9.R01)R;1HRNMR(RDMSO-d6)R, :R3.R07(Rdd,JR=5.R12,11.R92RHz,1H,3-HRcis)R,3.R44(Rdd,JR=12.R70,16.R96RHz,1H,3-HRtrans)R,3.R79(Rs,3H,4 -OCH3)R,5.R19(Rdd,JR=2.R48,9.R0
21、0RHz,1H,2-H)R,5.R65(Rs,1H,3 -OH)R,5.R91(Rs,2H,6,8-H)R,6.R87RR7.R55(Rm,7H,Ph H)R,8.R79(Rs,1H, NH)R,9.R11(Rs,1H,7-OH)R,10.R24(Rs,1H, NH)R,12.R87R(Rs,1H,5-OH)R;RIRR(RKBr)R, R/RcmR1:R3397(ROH)R,3299、3224(RNH)R,2999,2958,1671R(RCROR)R,1596R(RCRNR)R,1536,1442,1360,1242,825;RC23H20ClN3O6元素分析(R计算值)R/%:RCR59
22、.R03(R58.R79)R,HR4.R59(R4.R26)R,NR8.R71R(R8.R95)R。 橙皮素苯氨基硫脲腙(R4a)R:R黄色粉末,产率R21.R29%,mpRR300R。 1HRNMRR(RDMSO-d6)R, :R3.R07(Rdd,JR=R5.R10,12.R21RHz,1H,3-HRcis)R,3.R41(Rdd,JR=R12.R69,17.R08RHz,1H,3-HRtrans)R,3.R79(Rs,3H,4 -OCH3)R,5.R18(Rdd,JR=3.R03,9.R20RHz,1H,2-H)R,5.R71(Rs,1H,3 -OH)R,5.R91(Rs,2H,6-H,
23、8-H)R,6.R87RR7.R43(Rm,8H,Ph H)R,8.R74(Rs,1H, NH)R,9.R11(Rs,1H,7-OH)R,10.R24(Rs,1H, NH)R,12.R87(Rs,1H,5-OH)R;RIR(RKBr)R, /cmR1:R3410(ROH)R,3295、3221(RNH)R,2955,2835,1597(RCRN)R,1555,1500,1446,1242,1156,1087,757。 橙皮素对甲基苯氨基硫脲腙(R4b)R:R黄色粉末,产率R32.R26%,mpRR300R。 1HRNMR(RDMSO-d6)R, : 1.R07(Rs,3H,CH3)R,3.R0
24、7(Rdd,JR=R5.R08,12.R13RHz,1H,3-HRcis)R,3.R40(Rdd,JR=R12.R71,17.R38RHz,1H,3-Htrans)R,3.R79(Rs,3H,4 -OCH3)R,5.R20(Rdd,JR=2.R92,8.R94RHz,1H,2-H)R,5.R67(Rs,1H,3 -OH)R,5.R90(Rs,2H,6-H,8-H)R,6.R85RR7.R34R(Rm,7H,Ph H)R,8.R71R(Rs,1H, NH)R,9.R11R(Rs,1H,7-OH)R,10.R24R(Rs,1H, NH)R,12.R87(Rs,1H,5-OH)R;RIR(RKBr)
25、R, R/RcmR1:R3408(ROH)R,3229(RNH)R,2956,2834,1596(RCRN)R,1569,1532,1442,1278,1191(RCRSR)R,1088,823。 橙皮素对氯苯氨基硫脲腙(R4c)R:R黄色粉末,产率R32.R96%,mpRR300R。EI-MS(Rm/z,%)R:R450(R13.R65)R,300(R62.R15)R,285(R33.R72)R,178(R100)R,150(R38.R24)R,137(R79.R05)R,107(R51.R23)R,77(R43.R55)R,55(R58.R03)R;1HRNMRR(RDMSO-d6)R,
26、:R3.R07R(Rdd,JR=R5.R03,12.R12RHz,1H,3-HRcis)R,3.R42R(Rdd,JR=R12.R08,17.R26RHz,1H,3-HRtrans)R,3.R79(Rs,3H,4 -OCH3)R,5.R19(Rdd,JR=2.R88,9.R70RHz,1H,2-H)R,5.R75(Rs,1H,3 -OH)R,5.R89(Rs,2H,6,8-H)R,6.R86RR7.R31(Rm,7H,Ph H)R,7.R89(Rs,1H, NH)R,9.R11(Rs,1H,7-OH)R,10.R24(Rs,1H, NH)R,12.R87R(Rs,1H,5-OH)R;RIRR(
27、RKBr)R, /cmR1:R3408R(ROH)R,3205R(RNH)R,2999,2956,1596(RCRNN)R,1568,1441,1243,823;RC23H20ClN3O5SR元素分析R(R计算值)R/R%R:RCR56.R42R(R56.R85R)R,HR4.R65(R4.R12)R,NR8.R95(R8.R65)R。 橙皮素苯乙酰腙(R5a)R:R黄色粉末,产率36.R41%,mpR300R。EI-MS(Rm/z,%)R:R434(RM+,2.R97)R,300(R52.R66)R,285(R22.R59)R,150(R32.R63)R,137(R47.R30)R,107(
28、R46.R97)R,91(R45.R50)R,77(R46.R20)R,55(R75.R99)R;1HRNMR(RDMSO-d6,400RMHz)R, :R3.R06R(Rdd,JR=R2.R87,17.R01RHz,1H,3-HRcis)R,3.R45R(Rdd,JR=R8.R18,11.R36RHz,1H,3-HRtrans)R,3.R62(Rs,2H, CH2)R,3.R78(Rs,3H,4 -OCH3)R,5.R19(Rdd,JR=R2.R12,9.R43RHz,1H,2-H)R,5.R67(Rs,1H,3 -OH)R,5.R91(Rs,2H,6,8-H)R,6.R87RR7.R28(
29、Rm,8H,Ph H)R,9.R10(Rs,1H,7-OH)R,10.R24(Rs,1H, NH)R,12.R87R(Rs,1H,5-OH)R;RIRR(RKBr)R, /cmR1:R3409R(ROH)R,3232R(RNH)R,2999,2956,1660(RCRO)R,1596(RCRN)R,1569,1532,1441,1387,1028,823;RC24H22N2O6元素分析(R计算值)R/%:RCR66.R17(R66.R36)R,HR5.R35(R5.R07)R,NR6.R72(R6.R45)R。 橙皮素对硝基苯乙酰腙(R5b)R:R黄色粉末,产率R25.R05%,mpR300R
30、。 1HRNMR(RDMSO-d6,400RMHz)R, :R3.R07(Rdd,JR=R2.R65,16.R98RHz,1H,3-HRcis)R,3.R32(Rdd,JR=R7.R63,12.R11RHz,1H,3-HRtrans)R,3.R67(Rs,2H, CH2)R,3.R79(Rs,3H,4 -OCH3)R,5.R19(Rdd,JR=R2.R82,10.R23RHz,1H,2-H)R,5.R76(Rs,1H,3 -OH)R,5.R91(Rs,2H,6,8-H)R,6.R86RR7.R21R(Rm,7H,Ph H)R,9.R11R(Rs,1H,7-OH)R,10.R23R(Rs,1H,
31、 NH)R,12.R86R(Rs,1H,5-OH)R;RIR(RKBr)R, R/RcmR1:R3401(ROH)R,3297(RNH)R,2999,2956,2835,1665(RCRO)R,1595(RCRN)R,1568,1533,1442,1360,1087,824。 橙皮素萘乙酰腙(R5c)R:R黄色粉末,产率R17.R35%,mpRR300R。 1HRNMRR(RDMSO-d6,400RMHz)R, :3.R07(Rdd,JR=R5.R16,11.R92RHz,1H,3-HRcis)R,3.R34R(Rs,2H,-CH2)R,3.R45(Rdd,JR=R12.R70,17.R12R
32、Hz,1H,3-Htrans)R,3.R79(Rs,3H,4 -OCH3)R,5.R19(Rdd,JR=2.R56,8.R96RHz,1H,2-H)R,5.R72(Rs,1H,3 -OH)R,5.R91(Rs,2H,6,8-H)R,6.R87RR7.R52(Rm,10H,Ar H)R,9.R11R(Rs,1H,7-OH)R,10.R24R(Rs,1H, NH)R,12.R87R(Rs,1H,5-OH)R;RIR(RKBr)R, /cmR1:R3399(ROH)R,3287(RNH)R,2956,1660(RCRO)R,1597(RCRN)R,1516,1443,1357,1243,1026,8
33、22。 橙皮素苯氧乙酰腙(R6a)R:R黄色粉末,产率R38.R8%,mpR300R。EI-MS(Rm/z,%)R:R450(RM+,12.R37)R,314(R14.R08)R,300(R71.R96)R,285(R32.R23)R,178(R81.R33)R,150(R42.R09)R,137(R100)R,107(R33.R17)R,69(R80.R06)R,55(R57.R88)R;1HRNMR(RDMSO-d6,400RMHz)R, :R2.R50(Rdd,JR=R2.R90,17.R05RHz,1H,3-HRcis)R,3.R06(Rdd,JR=7.R88,11.R04RHz,1H
34、,3-HRtrans)R,3.R31R(Rs,2H, CH2O)R,3.R78R(Rs,3H,4 -OCH3)R,5.R18R(Rdd,JR=R2.R42,9.R24RHz,1H,2-H)R,5.R72(Rs,1H,3 -OH)R,5.R88(Rs,2H,6,8-H)R,6.R87RR7.R03(Rm,3H,2 ,5 ,6 -H)R,6.R92(Rm,3H,Ar H)R,6.R97R(Rm,2H,Ar H)R,9.R06R(Rs,1H,7-OH)R,10.R21R(Rs,1H, NH)R,12.R85R(Rs,1H,5-OH)R;RIR(RKBr)R, /cmR1:R3404(ROH)R,32
35、40(RNH)R,2997,2955,1664(RCRO)R,1596(RCRN)R,1532,1516,1440,1218,1028,824;RC24H22N2O7元素分析(R计算值)R/%:RCR63.R27(R63.R98)R,HR4.R53(R4.R89)R,NR6.R84(R6.R22)R。 橙皮素-(R2,4-二氯)R苯氧乙酰腙(R6b)R:R黄色粉末,产率R41.R22%,mpRR300;1HRNMRR(RDMSO-d6,400RMHz)R, :R3.R07(Rdd,JR=R5.R16,11.R96RHz,1H,3-HRcis)R,3.R46(Rdd,JR=R12.R71,17.
36、R70RHz,1H,3-HRtrans)R,3.R79(Rs,3H,4 -OCH3)R,4.R85(Rs,2H, CH2O)R,5.R19R(Rdd,JR=R2.R76,8.R84RHz,1H,2-H)R,5.R63R(Rs,1H,3 -OH)R,5.R91(Rs,2H,6,8-H)R,6.R87RR7.R61(Rm,6H,Ph H)R,9.R11(Rs,1H,7-OH)R,10.R25(Rs,1H, NH)R,12.R87(Rs,1H,5-OH)R;RIR(RKBr)R, /cmR1:R3399(ROH)R,3221(RNH)R,2998,2956,1667(RCRO)R,1594(RCRN
37、)R,1533,1442,1243,1027,823。 橙皮素苯氨基乙酰腙(R7a)R:R黄色粉末,产率R41.R43%,mpR300R。 1HRNMR(RDMSO-d6,400RMHz)R, :R3.R06(Rdd,JR=R2.R81,17.R02RHz,1H,3-HRcis)R,3.R32R(Rdd,JR=R11.R27,16.R32RHz,1H,3-HRtrans)R,3.R68R(Rs,2H, CH2)R,3.R79(Rs,3H,4 -OCH3)R,4.R33(Rs,1H, NH)R,5.R20(Rdd,JR=R2.R98,12.R59RHz,1H,2-H)R,5.R70(Rs,1H,
38、3 -OH)R,5.R90(Rs,2H,6,8-H)R,6.R86RR7.R18(Rm,8H,Ph H)R,9.R11(Rs,1H,7-OH)R,10.R24(Rs,1H, NH)R,12.R87(Rs,1H,5-OH)R;RIR(RKBr)R, /cmR1:R3407(ROH)R,3227(RNH)R,2998,2956,1660(RCRO)R,1596(RCRN)R,1516,1441,1260,1087,823。 橙皮素对甲基苯氨基乙酰腙(R7b)R:R黄色粉末,产率R18.R57%,mpRR300R。EI-MS(Rm/z,%)R:R463(RM+,4.R09)R,434(R17.R06
39、)R,312(R13.R07)R,300(R67.R10)R,285(R37.R87)R,178(R100)R,150(R49.R11)R,137(R91.R97)R,107(R61.R00)R,91(R42.R96)R,77(R53.R72)R,69(R67.R92)R,55(R38.R93)R;1HRNMR(RDMSO-d6,400RMHz)R, :R1.R50(Rs,3H, CH3)R,3.R07(Rdd,JR=2.R85,17.R05RHz,1H,3-HRcis)R,3.R45(Rdd,JR=R12.R72,17.R10RHz,1H,3-HRtrans)R,3.R65(Rs,2H, C
40、H2)R,3.R78(Rs,3H,4 -OCH3)R,4.R30(Rs,1H, NH)R,5.R18(Rdd,JR=R2.R72,12.R50RHz,1H,2-H)R,5.R69(Rs,1H,3 -OH)R,5.R90R(Rs,2H,6,8-H)R,6.R87RR7.R13R(Rm,7H,Ph H)R,9.R11R(Rs,1H,7-OH)R,10.R25(Rs,1H, NH)R,12.R87R(Rs,1H,5-OH)R;RIRR(RKBr)R, /cmR1:R3401R(ROH)R,3222R(RNH)R,2998,2955,1661(RCRO)R,1597R(RCRN)R,1532,1441
41、,1243,1027,822;RC25H25N3O6元素分析(R计算值)R/%:RCR64.R32(R64.R80)R,HR5.R14(R5.R40)R,NR9.R25(R9.R07)R。 测定了橙皮苷、橙皮素和化合物R1a、2aR的紫外光谱,在紫外光谱中带(R300RR400Rnm)R和带(R240R285Rnm)R是黄酮类化合物的2R个主要吸收带,测定结果能够看出化合物1a、2aR的带及带均发生红移,证明构成了席夫碱。测定了橙皮苷、橙皮素和R18R个橙皮素席夫碱的红外光谱,从谱图中能够看到母体化合物的RCRO吸收峰消失,代之出现了席夫碱RCRN吸收峰。测定了化合物R1a、2a、3c、4c、
42、5a、6aR和R7bR的质谱,从图中能够看到化合物的分子离子峰较弱,其它的离子峰能够得到较好的解释。测定了R18R个橙皮素席夫碱的核磁共振氢谱,能与构造较好吻合。对化合物R1a、2a、3c、4c、5a、6aR和R7bR进行了元素分析,结果与理论值能较好吻合。 通过化合物的紫外吸收光谱、红外光谱、1HRNMRR和RMSR图谱,能够确定生成的衍生物是目的化合物。 2R2R化合物的抗氧化活性 近年来,人们普遍以为生命经过中氧化代谢反响产生的各种过量自由基与很多疾病,如肿瘤、炎症和衰老等密切相关,因而寻找低毒或无毒的抗氧化物质已成为热门研究课题。本文测定了橙皮苷、橙皮素及席夫碱新化合物去除超氧自由基(
43、RO 2)R、羟自由基( OH)R和R2,2-二苯基-1-苦味酰基自由基(RDPPH )R的活性及总复原能力。实验经过中选用了多个浓度,结果发现低浓度时,去除自由基效果较弱,而高浓度时化合物在测定体系中的溶解度小,去除自由基效果也较弱,下面比拟了浓度为R1.R0Rg/L时各化合物的抗氧化活性,结果列于表R1。 从表R1R能够看出,在R1.R0Rg/LR时,橙皮苷、橙皮素及其席夫碱新化合物均具有去除自由基活性,并且部分席夫碱化合物作用强于橙皮苷和橙皮素,华而不实橙皮素对甲基苯氨基乙酰腙(R化合物R7b)R对RDPPH 自由基去除活性较强,去除率为R92.R66%;R橙皮素对氯苯甲酰腙(R化合物R
44、2a)R去除羟自由基( OH)R及超氧自由基(RO 2)R作用均较强,去除率分别为R72.R01%R和R81.R61%;R橙皮素对氯苯甲酰腙(R化合物R2a)R总复原能力较强,其抗氧化活性均强于橙皮苷和橙皮素,详细规律和作用机理尚待进一步研究。 3、R结R论 从中药陈皮中提取精制橙皮苷,通过酸水解制备橙皮素,再分别与R7R种类型的含氨基化合物在酸催化下缩合反响得到18R个相应的橙皮素席夫碱衍生物,用RUV、IR、1HRNMR、MSR及元素分析等技术手段对构造进行了表征,比拟了橙皮苷、橙皮素和这些橙皮素席夫碱衍生物去除超氧自由基(RO 2)R、羟自由基( OH)R和RDPPH 自由基的活性。结果
45、表示清楚,橙皮苷、橙皮素和橙皮素席夫碱衍生物均具有去除自由基活性,并且部分席夫碱化合物作用强于橙皮苷和橙皮素,华而不实橙皮素对甲基苯氨基乙酰腙(R化合物R7b)R对DPPH 自由基去除活性较强,橙皮素对氯苯甲酰腙R(R化合物R2a)R对羟自由基R(R OH)R和超氧自由基(RO 2)R去除作用及总复原能力均较强,值得进一步研究开发。 参 考 文 献 1Choi E M,Kim Y H Hesperetin Attenuates the Highly Reducing Sugar-triggered Inhibition of Osteoblast DifferentiationJ Cell B
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