

Citation: Ding Chengrong, Pan Yayun, Yin Xu, Tan Chengxia, Zhang Guofu. Synthesis and Insecticidal Activity of Novel Piperidine Thiazole Compounds[J]. Chinese Journal of Organic Chemistry, 2019, 39(3): 836-841. doi: 10.6023/cjoc201809009

新型哌啶噻唑类化合物的合成及杀虫活性
English
Synthesis and Insecticidal Activity of Novel Piperidine Thiazole Compounds
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Key words:
- oxathiapiprolin
- / piperidine-thiazolederivatives
- / insecticidal activity
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哌啶噻唑类化合物[1~3]是一类重要的药物中间体, 并且是微粒体甘油三酯转移蛋白(MTP)抑制剂[4.5].在新农药创制研究的过程中发现, 此类化合物具有一定的杀菌活性[6.7], 是农药先导研究的热点.杜邦公司在农药领域成功开发出哌啶噻唑类农药商品:增威赢绿(Zorvec Enicade).该品种具有新型的杀菌作用位点, 低毒、高效, 尤其对卵菌纲病原菌具有优异的杀菌活性.近几年哌啶噻唑类化合物得到了一定的发展, 对已报道的哌啶噻唑类化合物分析发现(图 1), 该类化合物在结构上继承了氟噻唑吡乙酮[8~10]的骨架, 具有不同程度的杀菌活性[11~19], 但在杀虫、除草方向的研究成果未见报道.
图 1
图式 1
在研究已报道的哌啶噻唑类化合物的结构中发现, 哌啶与噻唑相连的结构未发生变动, 是一种新型的官能团组, 在对该类化合物结构优化实验研究中发现, 结构6具有一定的杀虫活性, 因此本课题组在结构6的基础上设计[20~26]并合成了12个哌啶类噻唑类化合物(其合成路线如Scheme 1所示), 所有目标化合物的结构经1H NMR, 13C NMR和HRMS确认.初步生物活性测试表明, 该类化合物具有良好的粘虫杀灭活性, 具有继续深入研究的必要.
1. 结果与讨论
1.1 化合物的合成及结构表征
以间氯苯胺为底物, 经重氮化、氯化、环化得到中间体5, 中间体5脱保护后与酰氯反应最终得到目标化合物1a~ll.其中由中间体2和中间体4环化形成中间体5的实验过程中发现, 往常合成噻唑环的方法[27.28], 转化率基本在20%左右, 有大量的原料剩余, 现只有在冰醋酸作溶剂, 无水醋酸钠为缚酸剂, 80~85 ℃条件下, 才能完全转化得到中间体5[29], 同时在实验中发现, 如果继续升温中间体5会直接转化成中间体6.
以目标化合物1a为例进行谱学分析. 1H NMR谱图中δ 8.33~7.16为芳环上的质子信号, δ 3.86, 2.88, 2.50, 2.14, 1.93~1.81为哌啶环上质子信号; δ 2.35为甲基上的质子信号; 在HRMS谱图中, 该化合物分子离子峰计算值为[M+H]+ 447.0952, 测定值[M+H]+ 447.0962, 绝对误差在0.003以内.
1.2 化合物的杀虫活性
目标化合物1a~1l对粘虫的杀虫活性数据列于表 1, 在500 μg/mL浓度下, 化合物1a~1l对粘虫表现出良好的杀虫活性, 大多数化合物对粘虫的致死率到达70%以上, 其中化合物1f、1g对100 μg/mL的浓度下对粘虫的致死率达到80%以上.继续对目标化合物1f、1g进行杀虫活性, 数据列于表 2, 在20 μg/mL浓度下, 化合物1g对粘虫仍具有50%的杀虫活性.从1d与1e的比较可以发现, 取代基的位置对活性的影响是巨大的; 从1f、1g、1h、1j的比较可以发现, 芳香杂环种类的变化对目标化合物的生物活性产生明显的影响, 为探究和优化该类化合物提供了思路.
表 1
Compd. Armyworm Aphis medicaginis Koc Tetranychus cinnabarinus 500 μg/mL 100 μg/mL 500 μg/mL 100 μg/mL 500 μg/mL 100 μg/mL 5 80 0 0 0 0 0 6 80 0 0 0 0 0 1a 0 0 0 0 0 0 1b 80 0 0 0 0 0 1c 60 0 0 0 0 0 1d 0 0 0 0 0 0 1e 80 0 0 0 0 0 1f 100 80 0 0 0 0 1g 100 100 0 0 0 0 1h 70 0 0 0 0 0 1i 80 0 0 0 0 0 1j 100 0 0 0 0 0 1k 70 0 0 0 0 0 1l 70 0 0 0 0 0 Abamectin 100 100 100 100 100 100 表 2
表 2 进一步筛选1f和1g的杀虫活性(死亡率/%)Table 2. Further screening for insecticidal activities (mortality/%) of target compound 1f and 1gCompd. Armyworm 20 μg/mL 4 μg/mL 1f 0 0 1g 50 0 Abamectin 100 100 2. 结论
以化合物6为结构骨架, 设计并合成了12个含哌啶噻唑类化合物, 结构经1H NMR, 13C NMR, HRMS确认, 初步的生物活性测试结果表明, 部分目标化合物对粘虫表现出较好的杀虫活性, 其中1g在100 μg/mL浓度下对粘虫具有100%的杀虫活性, 在20 μg/mL浓度下对粘虫杀虫活性仍有50%.对于开发一种新型的哌啶噻唑类杀虫剂具有很重要的研究意义和参考价值, 进一步的结构优化和构效关系仍在进行中.
3. 实验部分
3.1 仪器与试剂
质谱采用Bruker Daltonics Bio-TOF-Q Ⅲ型质谱仪(ESIMS)测定; 天津光学仪器厂Ry-1G熔点仪, 温度计未经校正; 核磁共振波谱使用Bruker Avance 300型核磁共振仪测定.所有试剂为国产市售分析纯.
3.2 实验方法
3.2.1 N-boc-4-硫代酰胺哌啶(2)的合成
在带机械搅拌的250 mL的四口烧瓶中加入70% NaSH (14.2 g, 0.18 mol), NH4Cl (10.0 g, 0.18 mol), N, N-二甲基甲酰胺(DMF, 120 mL), 4-氰基哌啶-1-甲酸叔丁酯(8.6 g, 0.04 mol), 在室温下搅拌72 h, 反应完全后, 在1 L的烧杯中加入600 g冰水, 在搅拌过程中将250 mL四口瓶中的料液慢慢加入到冰水中, 搅拌1 h后, 出现大量白色固体, 抽滤, 滤液用乙酸乙酯萃取(100 mL×3), 旋蒸, 与滤饼合并烘干, 得中间体2, 收率95.2%.
3.2.2 1-(间氯苯基)-2-丙酮(3)和1-(间氯苯基)-2-氯-丙酮(4)的合成
3.2.3 4-(4-(3-氯苯基)-5-甲基噻唑-2-基)哌啶-1-甲酸叔丁酯(5)的合成
在250 mL三口瓶中加入中间体2 (10.0 g, 0.05 mol)和化合物4 (12.2 g, 0.05 mol), 100 mL冰醋酸, 20 g无水醋酸钠, 在85 ℃搅拌条件下, 反应过夜, 用饱和NaHCO3的水溶液调pH=8~9, 用乙酸乙酯萃取(30 mL×3), 旋蒸, 经纯化得到中间体5, 收率72.4%.白色固体, m.p. 145~147 ℃; 1H NMR (500 MHz, CDCl3) δ: 7.44~7.31 (m, 4H), 4.22 (s, 2H), 3.13 (tt, J=11.7, 3.7 Hz, 1H), 2.88 (s, 2H), 2.46 (s, 3H), 2.20~2.04 (m, 2H), 1.74 (qd, J=12.2, 4.3 Hz, 2H), 1.48 (s, 9H); 13C NMR (126 MHz, CDCl3) δ: 172.26, 154.71, 147.35, 133.73, 130.72, 130.37 (2C), 129.64, 128.90 (2C), 79.65, 43.71, 40.81 (2C), 32.47 (2C), 28.477(3C), 16.04. HRMS (ESI) calcd for C20H25ClN2O2SNa [M+Na]+ 415.1395, found 415.1403.
3.2.4 4-(4-(3-氯苯基)-5-甲基噻唑-2-基)哌啶-1-盐酸盐(6)的合成
在100 mL三口瓶中加入化合物5 (10.0 g, 255 mmol), 5 mol/L HCl二氧六环溶液20 mL, 在室温下反应4 h, 减压抽滤, 得到中间体6, 收率为88.6%.白色固体, m.p. 126~128 ℃; 1H NMR (500 MHz, DMSO-d6) δ: 9.38 (d, J=9.0 Hz, 1H), 9.24 (d, J=8.8 Hz, 1H), 7.56~7.46 (m, 4H), 3.41~3.25 (m, 3H), 3.07~2.95 (m, 2H), 2.40 (s, 3H), 2.22~2.13 (m, 2H), 2.05~1.90 (m, 2H); 13C NMR (126 MHz, DMSO-d6) δ: 168.23, 151.71, 134.32, 134.09, 131.81, 131.25, 130.04, 129.72, 128.72, 43.17 (2C), 37.00, 29.00 (2C), 17.35. HRMS (ESI) calcd for C15H18ClN2S [M+H]+ 293.0874, found 293.0882.
3.2.5 目标化合物1a~1l的合成
在封管中加入中间体6 (0.10 g, 0.26 mmol)、三乙胺(0.10 g, 0.99 mmol), 1 mL二氯甲烷和不同的酰氯或磺酰氯, 反应2 h, 水洗, 酸洗后, 用二氯甲烷萃取(10 mL×3), 旋蒸, 得到目标化合物1a~1l.
5-(3-氯苯基)-4-甲基-2-(1-甲苯磺酰基哌啶-4-基)噻唑(1a):收率90%.白色固体, m.p. 197~199 ℃; 1H NMR (500 MHz, CDCl3) δ: 7.70~7.62 (m, 2H), 7.41~7.30 (m, 5H), 7.30~7.24 (m, 1H), 3.89 (d, J=12.5 Hz, 2H), 2.91 (tt, J=11.7, 3.8 Hz, 1H), 2.48~2.38 (m, 8H), 2.24~2.12 (m, 2H), 1.92 (dtd, J=13.4, 11.8, 4.1 Hz, 2H); 13C NMR (126 MHz, CDCl3) δ: 171.50, 147.61, 143.62, 134.52, 133.76, 133.15, 129.90, 129.69 (2C), 129.57, 129.01, 127.84, 127.65 (2C), 127.24, 45.93 (2C), 39.72, 31.78 (2C), 21.50, 15.95; HRMS (ESI) calcd for C22H24ClN2O2S2 [M+H]+ 447.0952, found 447.0962.
5-(3-氯苯基)-4-甲基-2-(1-((4-硝基苯基)磺酰基)哌啶-4-基)噻唑(1b):收率92%.白色固体, m.p. 210~211 ℃; 1H NMR (500 MHz, CDCl3) δ: 8.33 (d, J=8.7 Hz, 2H), 7.91 (d, J=8.6 Hz, 2H), 7.34~7.21 (m, 3H), 7.21~7.16 (m, 1H), 3.86 (d, J=11.8 Hz, 2H), 2.88 (t, J=11.6 Hz, 1H), 2.50 (t, J=11.6 Hz, 2H), 2.35 (s, 3H), 2.14 (d, J=12.8 Hz, 2H), 1.93~1.81 (m, 2H); 13C NMR (126 MHz, CDCl3) δ: 170.68, 150.15, 147.82, 142.53, 134.50, 133.69, 129.90, 129.65, 128.99, 128.70 (2C), 127.84, 127.22, 124.38 (2C), 45.82 (2C), 39.41, 31.60 (2C), 16.01; HRMS (ESI) calcd for C21H20ClN3O4S2Na [M+Na]+ 500.0479, found 500.0476.
5-(3-氯苯基)-2-(1-((4-氯苯基)磺酰基)哌啶-4-基)-4-甲基噻唑(1c):收率95%, 白色固体, m.p. 178~180 ℃; 1H NMR (500 MHz, CDCl3) δ: 7.73 (d, J=9.2 Hz, 2H), 7.54 (d, J=8.4 Hz, 2H), 7.41~7.32 (m, 3H), 7.32~7.25 (m, 1H), 3.90 (d, J=11.6 Hz, 2H), 3.00 (tt, J=11.7, 3.9 Hz, 1H), 2.55~2.41 (m, 5H), 2.22 (d, J=13.8 Hz, 2H), 1.93 (qd, J=12.5, 4.1 Hz, 2H); 13C NMR (126 MHz, CDCl3) δ: 171.51, 147.33, 139.43, 134.84, 134.63, 133.47, 129.97, 129.80, 129.45 (2C), 129.04, 129.01 (2C), 128.04, 127.26, 45.85 (2C), 39.44, 31.70 (2C), 15.81; HRMS (ESI) calcd for C21H20Cl2N2O2S2Na [M+Na]+ 489.025, found 489.0235.
4-甲基-5-(3-氯苯基)-2-(α-萘甲酰哌啶基)噻唑(1d):收率90%, 白色固体, m.p. 197~199 ℃; 1H NMR (500 MHz, CDCl3) δ: 7.98~7.76 (m, 3H), 7.62~7.35 (m, 6H), 7.28 (dd, J=8.5, 2.4 Hz, 2H), 5.04 (dt, J=8.5, 4.3 Hz, 1H), 3.55 (td, J=9.0, 8.2, 3.8 Hz, 1H), 3.33 (q, J=11.3 Hz, 1H), 3.22~3.01 (m, 2H), 2.47 (d, J=4.8 Hz, 4H), 2.13~1.85 (m, 2H), 1.68 (dtd, J=59.2, 12.0, 7.8 Hz, 1H); 13C NMR (126 MHz, CDCl3) δ: 171.83, 169.43, 146.91, 134.20, 133.41, 131.92 (2C), 130.60 (2C), 130.02, 129.65, 129.46, 129.10, 128.41, 127.03, 126.43, 125.17, 124.71, 123.62, 122.16, 47.08, 41.47, 40.32, 33.28, 32.30, 15.73; HRMS (ESI) calcd for C26H23ClN2OSNa [M+Na]+469.1128, found 469.1112.
4-甲基-5-(间氯苯基)-2-(β-萘甲酰哌啶基)噻唑(1e):收率92%, 白色固体, m.p. 193~195℃; 1H NMR (500 MHz, CDCl3) δ: 7.96~7.64 (m, 4H), 7.58~7.02 (m, 7H), 4.78 (s, 1H), 3.87 (s, 1H), 3.31~2.78 (m, 3H), 2.38 (s, 3H), 2.31~1.59 (m, 4H); 13C NMR (126 MHz, CDCl3) δ: 171.76, 170.53, 147.73, 134.57, 133.83, 133.68, 133.22, 132.73, 129.96, 129.57, 129.09, 128.42, 128.38, 127.89, 127.81, 127.31, 127.09, 126.74 (2C), 124.21, 47.60, 42.17, 40.66, 32.82, 32.41, 16.06; HRMS (ESI) calcd for C26H23ClN2OSNa [M+Na]+ 469.1128, found 469.1112.
4-甲基-5-(间氯苯基)-2-(4-甲基哌嗪-1-甲酰哌啶基)噻唑(1f):收率93%, 黄色油状物; 1H NMR (500 MHz, CDCl3) δ: 7.37 (t, J=1.6 Hz, 1H), 7.35~7.23 (m, 3H), 3.78 (d, J=13.3 Hz, 2H), 3.36~3.22 (m, 4H), 3.14~3.05 (m, 1H), 2.94~2.85 (m, 2H), 2.48~2.35 (m, 7H), 2.29 (d, J=4.4 Hz, 3H), 2.10 (d, J=10.7 Hz, 2H), 1.79 (qd, J=12.5, 3.9 Hz, 2H); 13C NMR (126 MHz, CDCl3) δ: 172.20, 163.89, 147.74, 134.48, 134.05, 129.86, 129.29, 129.04, 127.69, 127.25, 54.74 (2C), 46.84 (2C), 46.62 (2C), 46.07, 40.93, 32.35 (2C), 16.11; HRMS (ESI) calcd for C21H28ClN4OS [M+H]+419.1659, found 419.1667.
(4-(5-(3-氯苯基)-4-甲基噻唑-2-基)哌啶-1-基)(4-硝基-1H-吡唑-3-基)甲酮(1g):收率93%, 褐色油状物; 1H NMR (500 MHz, DMSO-d6) δ: 8.87 (s, 1H), 7.52~7.37 (m, 4H), 4.59 (d, J=12.2 Hz, 1H), 3.50 (d, J=15.5 Hz, 1H), 3.31 (tq, J=10.9, 3.5 Hz, 1H), 3.26~3.16 (m, 1H), 3.09~2.99 (m, 2H), 2.39 (d, J=2.2 Hz, 3H), 2.22~2.10 (m, 1H), 1.99 (d, J=14.0 Hz, 1H), 1.63 (dqd, J=41.0, 12.2, 4.3 Hz, 2H); 13C NMR (126 MHz, DMSO-d6) δ: 171.26, 160.03, 147.60, 141.50, 133.70, 133.51, 131.78, 131.15, 130.70, 128.56, 128.23, 127.67, 127.54, 45.86, 45.58, 40.84, 32.21, 31.56, 16.01; HRMS (ESI) calcd for C19H18ClN5O3SNa [M+Na]+ 454.0700, found 454.0711.
(4-(5-(3-氯苯基)-4-甲基噻唑-2-基)哌啶-1-基)-(4-甲基-2-(三氟甲基)噻唑-5-基)甲酮(1h):收率91%, 白色固体, m.p. 176~178 ℃; 1H NMR (500 MHz, CDCl3) δ: 7.45~7.25 (m, 4H), 4.75 (d, J=12.3 Hz, 1H), 3.69 (d, J=13.1 Hz, 1H), 3.26 (dd, J=22.8, 10.6 Hz, 2H), 3.05 (t, J=11.8 Hz, 1H), 2.76 (s, 3H), 2.47 (s, 3H), 2.26 (d, J=12.0 Hz, 1H), 2.15 (d, J=11.9 Hz, 1H), 1.95~1.70 (m, 2H); 13C NMR (126 MHz, CDCl3) δ: 171.10, 167.72. 159.11, 147.66, 139.44 (q, J=36.6 Hz), 134.59, 133.62, 131.98, 129.94, 129.76, 129.06, 127.96, 127.28, 120.20 (q, J=271.7 Hz), 47.13, 41.99, 40.10, 32.21, 31.68, 19.08, 15.96; HRMS (ESI) calcd for C21H19ClF3N3OS2Na [M+Na]+ 508.0522, found 508.0502.
(4-(5-(3-氯苯基)-4-甲基噻唑-2-基)哌啶-1-基)(4-碘苯基)甲酮(1i):收率88%, 白色固体, m.p. 176~178 ℃; 1H NMR (500 MHz, CDCl3) δ: 7.77~7.69 (m, 2H), 7.57~7.49 (m, 2H), 7.41~7.32 (m, 3H), 7.28 (dt, J=6.9, 1.8 Hz, 1H), 3.91 (dt, J=12.7, 3.8 Hz, 2H), 3.13~3.04 (m, 1H), 2.54~2.44 (m, 5H), 2.24 (dt, J=13.4, 2.3 Hz, 2H), 1.99~1.87 (m, 2H); 13C NMR (126 MHz, CDCl3) δ: 172.07, 146.67, 139.51, 134.75, 133.02, 130.09, 129.59, 129.49 (2C), 129.41, 129.06, 129.02 (2C), 128.32, 128.27, 127.27, 45.84 (2C), 39.21, 31.73 (2C), 15.55; HRMS (ESI) calcd for C22H20ClIN2OSNa [M+Na]+ 544.9901, found 544.9922.
(4-氯苯基)-(4-(5-(3-氯苯基)-4-甲基噻唑-2-基)哌啶- 1-基)甲酮(1j):收率86%, 白色固体, m.p. 174~176℃; 1H NMR (500 MHz, CDCl3) δ: 7.44~7.32 (m, 7H), 7.30 (dt, J=7.2, 1.7 Hz, 1H), 4.78 (s, 1H), 3.88 (s, 1H), 3.36~2.87 (m, 3H), 2.48 (s, 3H), 2.25 (s, 2H), 1.80 (d, J=30.2 Hz, 2H); 13C NMR (126 MHz, CDCl3) δ: 171.50, 169.40, 147.81, 135.80, 134.60, 134.30, 133.84, 129.94, 129.58 (2C), 129.11, 128.80, 128.48 (2C), 127.89, 127.30, 47.54, 42.24, 40.58, 32.46, 29.69, 16.06; HRMS (ESI) calcd for C22H20Cl2N2OSNa [M+Na]+453.0571, found 453.0566.
((5-(3-氯苯基)-4-甲基噻唑-2-基)哌啶-1-羰基)苯甲腈(1k):收率90%, 褐色固体, m.p. 184~186 ℃; 1H NMR (500 MHz, CDCl3) δ: 7.66 (d, J=7.8 Hz, 2H), 7.47 (d, J=7.9 Hz, 2H), 7.38~7.07 (m, 4H), 4.84~4.62 (m, 1H), 3.69 (d, J=10.5 Hz, 1H), 3.46~3.30 (m, 1H), 3.07 (d, J=17.3 Hz, 2H), 2.45 (s, 3H), 2.23 (s, 2H); 1.97~1.64 (m, 2H); 13C NMR (126 MHz, CDCl3) δ: 172.21, 168.27, 146.41, 140.09, 134.73, 132.42 (2C), 130.10 (2C), 129.01, 128.41 (2C), 127.58, 127.23 (2C), 117.97, 113.49, 47.26, 41.92, 39.81, 32.68, 31.90, 15.39; HRMS (ESI) calcd for C23H21ClN3OS [M+H]+ 422.1072, found 422.1088.
4-甲基-5-(3-氯苯基)-2-(对三氟甲基苯甲酰哌啶基)噻唑(1l):收率91%, 白色固体, m.p. 201~203 ℃; 1H NMR (500 MHz, CDCl3) δ: 7.62 (d, J=7.4 Hz, 2H), 7.55 (d, J=7.7 Hz, 1H), 7.49 (t, J=7.6 Hz, 1H), 7.31 (q, J=7.9, 6.9 Hz, 3H), 7.23 (s, 1H), 4.86~4.63 (m, 1H), 3.75 (s, 1H), 3.44 (s, 1H), 3.00 (d, J=37.0 Hz, 2H), 2.47 (s, 3H), 2.19 (d, J=35.3 Hz, 2H), 1.78 (d, J=58.4 Hz, 2H); 13C NMR (126 MHz, CDCl3) δ: 145.87, 136.47, 134.80, 132.38, 131.04 (q, J=32.4 Hz), 130.27, 130.17 (2C), 129.13, 128.99, 128.57, 127.22, 126.58~126.41 (m, 2C), 123.90 (q, J=3.8 Hz, 2C), 123.56 (q, J=272.5 Hz), 47.42, 41.86, 39.67, 32.70, 31.89, 15.13; HRMS (ESI) calcd for C23H20ClF3N2OSNa [M+Na]+487.084, found 487.0829.
3.3 生物活性测试
3.3.1 目标化合物对粘虫的杀虫活性
采用浸渍法测定目标化合物对蚜虫的杀虫活性.对于目标化合物用分析天平(0.0001 g)称取一定质量的原药, 用含1%吐温-80乳化剂的DMF溶解配制成1%母液, 然后用蒸馏水稀释备用, 每个处理三个重复, 设空白对照, 阿维菌素作为对照药剂.
将适量玉米叶在配好的药液中充分浸润后自然阴干, 放入垫有滤纸的培养皿中, 接粘虫3龄中期幼虫10头/皿, 置于24~27 ℃观察室内培养, 3 d后调查结果.以毛笔触动虫体, 无反应视为死虫, 并进行统计分析.
3.3.2 目标化合物对苜蓿蚜和朱砂叶螨的杀虫活性
采用浸渍法测定目标化合物对苜蓿蚜和朱砂叶螨的杀虫活性[32].对于目标化合物用分析天平(0.0001 g)称取一定质量的原药, 用含1%吐温-80乳化剂的DMF溶解配制成1%母液, 然后用蒸馏水稀释备用, 每个处理三个重复, 设空白对照, 阿维菌素作为对照药剂.
分别将接有朱砂叶螨和苜蓿蚜的蚕豆叶片于Potter喷雾塔下喷雾处理, 处理后朱砂叶螨置于24~27 ℃观察室内培养, 苜蓿蚜置于20~22 ℃观察室内培养, 48 h后调查结果.以毛笔触动虫体, 无反应视为死虫, 并进行统计分析.
辅助材料(Supporting Information)化合物1a~1l的1H NMR, 13C NMR和HRMS图谱.这些材料可以免费从本刊网站(http://sioc-journal.cn/)上下载.
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表 1 目标化合物1a~1l的杀虫活性(死亡率/%)
Table 1. Insecticidal activities (mortality/%) of target compounds 1a~1l
Compd. Armyworm Aphis medicaginis Koc Tetranychus cinnabarinus 500 μg/mL 100 μg/mL 500 μg/mL 100 μg/mL 500 μg/mL 100 μg/mL 5 80 0 0 0 0 0 6 80 0 0 0 0 0 1a 0 0 0 0 0 0 1b 80 0 0 0 0 0 1c 60 0 0 0 0 0 1d 0 0 0 0 0 0 1e 80 0 0 0 0 0 1f 100 80 0 0 0 0 1g 100 100 0 0 0 0 1h 70 0 0 0 0 0 1i 80 0 0 0 0 0 1j 100 0 0 0 0 0 1k 70 0 0 0 0 0 1l 70 0 0 0 0 0 Abamectin 100 100 100 100 100 100 表 2 进一步筛选1f和1g的杀虫活性(死亡率/%)
Table 2. Further screening for insecticidal activities (mortality/%) of target compound 1f and 1g
Compd. Armyworm 20 μg/mL 4 μg/mL 1f 0 0 1g 50 0 Abamectin 100 100 -

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