β-Amino esters were synthesized via ZnCl2-catalyzed Mannich-type reaction of imines and malonate esters under solvent-free conditions in 6 min. The β-amino ester was converted into the corresponding aspartic acid de...β-Amino esters were synthesized via ZnCl2-catalyzed Mannich-type reaction of imines and malonate esters under solvent-free conditions in 6 min. The β-amino ester was converted into the corresponding aspartic acid derivatives.展开更多
Phenylurea reacted with dichlorophenylphosphine and aldehydes or ketones by Mannich-type reaction in anhydrous benzene to give five-mem- bered phosphorous heterocyclic compounds.However.derivatives of α-ureidoalkylph...Phenylurea reacted with dichlorophenylphosphine and aldehydes or ketones by Mannich-type reaction in anhydrous benzene to give five-mem- bered phosphorous heterocyclic compounds.However.derivatives of α-ureidoalkylphosphonic acids were obtained as the reaction performed in glacial acetic acid.展开更多
Mannich-type reactions of aldimines with silyl enolates and hetero Diels-Alder reactions of aldehydes with Danishef-sky’s diene in the presence of anion catalysts derived from proline were performed to afford the cor...Mannich-type reactions of aldimines with silyl enolates and hetero Diels-Alder reactions of aldehydes with Danishef-sky’s diene in the presence of anion catalysts derived from proline were performed to afford the corresponding products in high yields.展开更多
Reaction of imines with 2-silyloxydiene catalyzed by ammonium chloride has been perfectly proceeded under environmentally friendly conditions to give Mannich-type product selectively. The reaction would proceed via Ma...Reaction of imines with 2-silyloxydiene catalyzed by ammonium chloride has been perfectly proceeded under environmentally friendly conditions to give Mannich-type product selectively. The reaction would proceed via Mannich-type mechanism, not cyclization/ring-opening process. Cyclopropanation of the corresponding Mannich-type product gave the precursor of prasugrel skeleton in high yield.展开更多
<正> A series of O,O-diethyl-α-（p-toluenesulphonamido）phosphonates have been synthesized by theMannich-type reaction of p-toluenesulphonamide,substituted benzaldehydes and diethyl phosphite with acetylchlorid...<正> A series of O,O-diethyl-α-（p-toluenesulphonamido）phosphonates have been synthesized by theMannich-type reaction of p-toluenesulphonamide,substituted benzaldehydes and diethyl phosphite with acetylchloride as the solvent.The mechanism of the reaction is suggested,and the structures of new products areconfirmed by1H NMR,31p NMR,elemental analysis and X-ray diffraction.The results of preliminarybioassay showed that some of them possess herbicidal activities.展开更多
<正> The Mannich-type reaction of phenylurea with phenyl dichlorophosphine and aldehydes （or ketones） is studied in this paper. It is found that straight chain and cyclic products are obtained respectively, wh...<正> The Mannich-type reaction of phenylurea with phenyl dichlorophosphine and aldehydes （or ketones） is studied in this paper. It is found that straight chain and cyclic products are obtained respectively, when different solvents are used.The ways of cyclization are affected by the substituents of ketones.There exist two geometrical isomers for each of the title compounds which are proved by their1H NMR and31P NMR spectra, and the configuration of each isomer is confirmed by means of X-ray diffraction and1H NMR spectra. Besides, it is found that the five-membered phosphorus heterocycle is of a plane conformation with a dπ-pπ bond between P and N.展开更多
A convenient procedure for the preparation of some new germasesquioxides containing phosphonyl groups carried by an intramolecular catalytic Mannich-type reaction is reported.
Herein,a rapid alkenylation of quinoxalin-2(1H)-ones enabled by a combination of Mannich-type reaction and solar photocatalysis is demonstrated.A wide range of functional groups are compatible,affording the correspond...Herein,a rapid alkenylation of quinoxalin-2(1H)-ones enabled by a combination of Mannich-type reaction and solar photocatalysis is demonstrated.A wide range of functional groups are compatible,affording the corresponding products in moderate-to-good yields.Control experiments illustrate that the in situ generated^(1)O_(2)plays a central role in this reaction.This green and efficient strategy provides a practical solution for the synthesis of potentially bioactive compounds that containing a 3,4-dihydroquinoxalin-2(1H)-one structure.展开更多
目的寻找具有内皮依赖性舒张血管活性的新结构胺基膦酸酯类化合物。方法运用一种新型的类M ann ich反应,以生物电子等排体原理设计合成了一系列α-胺基苄基膦酸酯类化合物,并运用离体大鼠血管环和离体豚鼠回肠收缩实验观察其舒张血管活...目的寻找具有内皮依赖性舒张血管活性的新结构胺基膦酸酯类化合物。方法运用一种新型的类M ann ich反应,以生物电子等排体原理设计合成了一系列α-胺基苄基膦酸酯类化合物,并运用离体大鼠血管环和离体豚鼠回肠收缩实验观察其舒张血管活性及其对M受体的激动作用。结果共合成了7个新的α-胺基苄基膦酸酯类目标化合物,其结构经IR,1H NMR和元素分析确定。初步离体血管环实验和离体豚鼠回肠收缩实验结果显示,化合物2a,2b和2 c有一定的舒张血管活性且不激活平滑肌M受体。结论在浓度为1×10-5mol.L-1时,化合物2b和2 c有较强的舒张血管活性,其舒张率分别为(67±21)%,(82±18)%,而且不激动M受体,其中,化合物2b有内皮依赖性的舒张血管反应。展开更多
基金the financial support form National Natural Science Foundation of China(No.20472116).
文摘β-Amino esters were synthesized via ZnCl2-catalyzed Mannich-type reaction of imines and malonate esters under solvent-free conditions in 6 min. The β-amino ester was converted into the corresponding aspartic acid derivatives.
基金the National Natural Science Foundation of People's Republic of China:
文摘Phenylurea reacted with dichlorophenylphosphine and aldehydes or ketones by Mannich-type reaction in anhydrous benzene to give five-mem- bered phosphorous heterocyclic compounds.However.derivatives of α-ureidoalkylphosphonic acids were obtained as the reaction performed in glacial acetic acid.
文摘Mannich-type reactions of aldimines with silyl enolates and hetero Diels-Alder reactions of aldehydes with Danishef-sky’s diene in the presence of anion catalysts derived from proline were performed to afford the corresponding products in high yields.
文摘Reaction of imines with 2-silyloxydiene catalyzed by ammonium chloride has been perfectly proceeded under environmentally friendly conditions to give Mannich-type product selectively. The reaction would proceed via Mannich-type mechanism, not cyclization/ring-opening process. Cyclopropanation of the corresponding Mannich-type product gave the precursor of prasugrel skeleton in high yield.
基金the National Natural Science Foundation of China
文摘<正> A series of O,O-diethyl-α-（p-toluenesulphonamido）phosphonates have been synthesized by theMannich-type reaction of p-toluenesulphonamide,substituted benzaldehydes and diethyl phosphite with acetylchloride as the solvent.The mechanism of the reaction is suggested,and the structures of new products areconfirmed by1H NMR,31p NMR,elemental analysis and X-ray diffraction.The results of preliminarybioassay showed that some of them possess herbicidal activities.
文摘<正> The Mannich-type reaction of phenylurea with phenyl dichlorophosphine and aldehydes （or ketones） is studied in this paper. It is found that straight chain and cyclic products are obtained respectively, when different solvents are used.The ways of cyclization are affected by the substituents of ketones.There exist two geometrical isomers for each of the title compounds which are proved by their1H NMR and31P NMR spectra, and the configuration of each isomer is confirmed by means of X-ray diffraction and1H NMR spectra. Besides, it is found that the five-membered phosphorus heterocycle is of a plane conformation with a dπ-pπ bond between P and N.
基金Project supported by the National Natural Science Foundation of China.
文摘A convenient procedure for the preparation of some new germasesquioxides containing phosphonyl groups carried by an intramolecular catalytic Mannich-type reaction is reported.
基金the Natural Science Foundation of Zhejiang Province(No.LY21B060009)the National Natural Science Foundation of China(No.21871071)for financial support.
文摘Herein,a rapid alkenylation of quinoxalin-2(1H)-ones enabled by a combination of Mannich-type reaction and solar photocatalysis is demonstrated.A wide range of functional groups are compatible,affording the corresponding products in moderate-to-good yields.Control experiments illustrate that the in situ generated^(1)O_(2)plays a central role in this reaction.This green and efficient strategy provides a practical solution for the synthesis of potentially bioactive compounds that containing a 3,4-dihydroquinoxalin-2(1H)-one structure.
