研究了以3-氯-邻苯二甲酸酐为原料,经甲胺化、偶联、水解和脱水反应制备2,2,′3,3′-联苯四酸二酐(i-BPDA)的工艺过程,偶联反应以三苯基膦(PPh3)为配位体的镍络合物为催化剂、锌粉为还原剂、碘化钠为促进剂。采用红外光谱、氢核磁共振对...研究了以3-氯-邻苯二甲酸酐为原料,经甲胺化、偶联、水解和脱水反应制备2,2,′3,3′-联苯四酸二酐(i-BPDA)的工艺过程,偶联反应以三苯基膦(PPh3)为配位体的镍络合物为催化剂、锌粉为还原剂、碘化钠为促进剂。采用红外光谱、氢核磁共振对i-BPDA及反应中间产物的结构进行了表征,并用高效液相色谱测定了i-BPDA的纯度。实验结果表明,中间产物N-甲基-3-氯-邻苯酰亚胺(C8H6NO2C l)偶联反应的收率受催化剂的种类、催化剂配比、反应时间和反应温度的影响,其中当催化剂中的镍化合物为无水N iC l2时,催化剂的活性最高;最佳偶联条件为:n(C8H6NO2C l)∶n(N iC l2)∶n(PPh3)∶n(Zn)=1∶1∶4∶1.1,反应时间5h,反应温度110℃。在此条件下,偶联产物的收率为69.0%。i-BPDA的平均纯度大于98%。展开更多
目的采用HPLC测定赤胫散中的3,3＇-二甲基鞣花酸和3,3＇,4＇-三甲基鞣花酸。方法色谱柱为Dikma-C18柱,流动相为甲醇-乙腈-0.1%磷酸（17∶33∶50）,流速1 m L·min^-1,检测波长248 nm,柱温30℃。结果 3,3＇-二甲基鞣花酸0.198-0.990...目的采用HPLC测定赤胫散中的3,3＇-二甲基鞣花酸和3,3＇,4＇-三甲基鞣花酸。方法色谱柱为Dikma-C18柱,流动相为甲醇-乙腈-0.1%磷酸（17∶33∶50）,流速1 m L·min^-1,检测波长248 nm,柱温30℃。结果 3,3＇-二甲基鞣花酸0.198-0.990μg（r=0.9991）、3,3＇,4＇-三甲基鞣花酸0.098-0.491μg（r=0.9990）与峰面积的线性关系良好,回收率分别为102.40%、98.41%,RSD分别为2.25%、1.87%（n=6）。结论所用方法简便、快捷、准确,可用于赤胫散药材的质量控制。展开更多
A robust bulky bornylimidazo[1,5-a]pyridin-3-ylidene allylic Pd complex was synthesized and well characterized.DFT calculations indicated that the ligand acts as a strongσ-donor andπ-acceptor endowing the active Pd(...A robust bulky bornylimidazo[1,5-a]pyridin-3-ylidene allylic Pd complex was synthesized and well characterized.DFT calculations indicated that the ligand acts as a strongσ-donor andπ-acceptor endowing the active Pd(0)center with high electron density and good coordination towards olefin.The introduction of a bulky,rigid bornyl ring further improved the catalytic efficacy due to the matched steric effects.This catalyst showed high efficiency and versatility in theα-arylation and Heck cyclization/Suzuki crosscoupling reactions at mild reaction conditions.Desired 3,3-disubstituted oxindoles,especially featuring an allylic-derived C3-quaternary stereocenter were obtained in high yields.Furthermore,the concise synthesis of bioactive heterocycle-fused indoline alkaloids was successfully proved.展开更多
文摘研究了以3-氯-邻苯二甲酸酐为原料,经甲胺化、偶联、水解和脱水反应制备2,2,′3,3′-联苯四酸二酐(i-BPDA)的工艺过程,偶联反应以三苯基膦(PPh3)为配位体的镍络合物为催化剂、锌粉为还原剂、碘化钠为促进剂。采用红外光谱、氢核磁共振对i-BPDA及反应中间产物的结构进行了表征,并用高效液相色谱测定了i-BPDA的纯度。实验结果表明,中间产物N-甲基-3-氯-邻苯酰亚胺(C8H6NO2C l)偶联反应的收率受催化剂的种类、催化剂配比、反应时间和反应温度的影响,其中当催化剂中的镍化合物为无水N iC l2时,催化剂的活性最高;最佳偶联条件为:n(C8H6NO2C l)∶n(N iC l2)∶n(PPh3)∶n(Zn)=1∶1∶4∶1.1,反应时间5h,反应温度110℃。在此条件下,偶联产物的收率为69.0%。i-BPDA的平均纯度大于98%。
文摘目的采用HPLC测定赤胫散中的3,3＇-二甲基鞣花酸和3,3＇,4＇-三甲基鞣花酸。方法色谱柱为Dikma-C18柱,流动相为甲醇-乙腈-0.1%磷酸（17∶33∶50）,流速1 m L·min^-1,检测波长248 nm,柱温30℃。结果 3,3＇-二甲基鞣花酸0.198-0.990μg（r=0.9991）、3,3＇,4＇-三甲基鞣花酸0.098-0.491μg（r=0.9990）与峰面积的线性关系良好,回收率分别为102.40%、98.41%,RSD分别为2.25%、1.87%（n=6）。结论所用方法简便、快捷、准确,可用于赤胫散药材的质量控制。
基金Financial supports from the National Natural Science Foundation of China(No.22101133)Natural Science Foundation of Jiangsu Province(No.BK20200768)+1 种基金Nanjing Forestry University,the National Natural Science Foundation of China(the Outstanding Youth Scholars(Overseas,2021)project)the Lab project of the State Key Laboratory of Physical Chemistry of Solid Surfaces are greatly acknowledged.
文摘A robust bulky bornylimidazo[1,5-a]pyridin-3-ylidene allylic Pd complex was synthesized and well characterized.DFT calculations indicated that the ligand acts as a strongσ-donor andπ-acceptor endowing the active Pd(0)center with high electron density and good coordination towards olefin.The introduction of a bulky,rigid bornyl ring further improved the catalytic efficacy due to the matched steric effects.This catalyst showed high efficiency and versatility in theα-arylation and Heck cyclization/Suzuki crosscoupling reactions at mild reaction conditions.Desired 3,3-disubstituted oxindoles,especially featuring an allylic-derived C3-quaternary stereocenter were obtained in high yields.Furthermore,the concise synthesis of bioactive heterocycle-fused indoline alkaloids was successfully proved.
