An efficiently catalytic method toward the synthesis of indolin-2-ones featuring an allylic derived C_(3)-quaternary stereocenter via an intramolecular Heck cyclization/Suzuki coupling of N-substituted-N-(2-bromopheny...An efficiently catalytic method toward the synthesis of indolin-2-ones featuring an allylic derived C_(3)-quaternary stereocenter via an intramolecular Heck cyclization/Suzuki coupling of N-substituted-N-(2-bromophenyl)acrylamides and organoboron reagents was successfully developed by using a 1,3-bis(2,6-diisopropylphenyl)acenaphthoimidazol-2-ylidene(AnIPr)-ligated oxazoline palladacycle.It enabled a very broad substrate scope tolerating different functional groups,electronic properties and steric bulkiness.Notably,it revealed a great potential to build diverse heterocycle-fused indoline alkaloids via the same intermediate 3-allyl-1,3-dimethylindolin-2-one.展开更多
A highly diastereoselective and enantioselective Michael addition/desymmetrization reaction of maleimides with prochiral 3-substituted phthalides catalyzed by quinine-derived bifunctional thiourea was realized. A broa...A highly diastereoselective and enantioselective Michael addition/desymmetrization reaction of maleimides with prochiral 3-substituted phthalides catalyzed by quinine-derived bifunctional thiourea was realized. A broad range of the 3,3′-disubstituted phthalides bearing vicinal quaternary-tertiary stereogenic centers were synthesized in moderate to good yields(up to 96%) with high diastereoselectivities(up to >19:1 dr) and enantioselectivities(up to 96:4 er).展开更多
A H_(4)SiW_(12)O_(40)-catalyzed three-component tandem reaction of 2-acylbenzoic acids,primary amines and phosphine oxides to form 3,3-disubstituted isoindolinones was developed.By employing A H_(4)SiW_(12)O_(40)as th...A H_(4)SiW_(12)O_(40)-catalyzed three-component tandem reaction of 2-acylbenzoic acids,primary amines and phosphine oxides to form 3,3-disubstituted isoindolinones was developed.By employing A H_(4)SiW_(12)O_(40)as the catalyst and dimethyl carbonate(DMC)as the solvent,a diverse range of 2-acylbenzoic acid derivatives and primary amines worked well to give the C3-phosphinoyl-functionalized 3,3-disubstituted isoindolinones with the yield range of 61%-87%.Advantages of this transformation include green catalyst and solvent,available starting materials,broad substrate scope,high efficiency and operational simplicity with water as the sole by-product.The strategy achieved an efficient and green molecular fragment assembly to access isoindolinones,which would provide opportunities for the synthesis of potential biologically active molecules in a green manner.展开更多
A novel kinetic resolution(KR) method has been developed for 3,3-disubstituted indolines, whose catalytic asymmetric synthesis remains a significant challenge in organic synthesis. The key to the success of this KR pr...A novel kinetic resolution(KR) method has been developed for 3,3-disubstituted indolines, whose catalytic asymmetric synthesis remains a significant challenge in organic synthesis. The key to the success of this KR protocol lies in the utilization of chiral phosphoric acid-catalyzed triazane formation reaction with azodicarboxylates, which enables the enantioselective synthesis of various substituted indolines bearing C3-quaternary stereocenters with good to high enantioselectivities(with sfactors up to 70). Moreover, an intriguing parallel kinetic resolution(PKR) has been developed by combining triazane formation and dehydrogenation reactions using different azodicarboxylates. Experimental studies have provided insight into the mechanism of this PKR reaction, demonstrating stereoselectivity in both triazane formation and dehydrogenation steps, favoring the opposite enantiomers. The large-scale synthesis and diverse derivatizations of the products, particularly the imine groupcontaining 3H-indoles, demonstrate the value of these(P)KR methods.展开更多
The calcined Mg-A1 layered double hydroxides （LDHs） with a Mg/A1 molar ratio of 3 ： 1 were synthesized and characterized thoroughly by X-ray diffraction （XRD）, temperature-programmed desorption （TPD） of CO2, an...The calcined Mg-A1 layered double hydroxides （LDHs） with a Mg/A1 molar ratio of 3 ： 1 were synthesized and characterized thoroughly by X-ray diffraction （XRD）, temperature-programmed desorption （TPD） of CO2, and thermogravimetric analysis （TGA）. Thus the calcined Mg-A1 LDHs were used as catalyst for the catalytic synthesis of disubstituted ureas from amines and CO2. The effects of reaction time, reaction temperature, pressure, solvent and calcined temperature on activity have been investigated. The results indicated that aliphatic amines, cyclo- hexylamine and benzylamine can be converted to the corresponding ureas selectively over the calcined Mg-A1 LDHs catalysts with N-methyl-2-pyrrolidone （NMP） as solvent without using any dehydrating regent. The catalyst can be recycled several times with only slight loss of activity.展开更多
,3-Disubstituted quinoxalines were synthesized from α-acetylthioformanilide and ophenylenediamine. Further studies sliowed that there existed competitive re- actions. One was a condensation reaction which produced su...,3-Disubstituted quinoxalines were synthesized from α-acetylthioformanilide and ophenylenediamine. Further studies sliowed that there existed competitive re- actions. One was a condensation reaction which produced substituted quinoxaline and the other was a substitution reaction which produced substituted quinoxaline-2- thione.展开更多
An efficient and easy method for one-pot three-component synthesis of l,3-disubstituted-3H-benzo[f]chromenes by the condensation of naphtol,aromatic aldehyde derivatives and phenylacetylene in the presence of ferric h...An efficient and easy method for one-pot three-component synthesis of l,3-disubstituted-3H-benzo[f]chromenes by the condensation of naphtol,aromatic aldehyde derivatives and phenylacetylene in the presence of ferric hydrogensulfate[Fe（HSO4）3], has been described.The catalyst displayed high activity which afforded the corresponding 1,3-disubstituted-3H-benzo[f]chromenes in satisfying yields.Alkyl-substituted phenols were examined and the corresponding benzopyran derivatives were synthesized in moderate yields.Heterogeneous nature of the using catalyst made it reusable for further chemical reactions.展开更多
采用密度泛函理论中的广义梯度近似（DFT/GGA）方法,在PW91/DNP水平上研究了21种2,3-二取代喹唑啉-4（3H）-酮化合物的结构、化学活性和前线轨道.结果表明：此类化合物的能隙Eg大部分都在3.50-3.60 e V之间,其中在喹唑啉环3位上取代甲...采用密度泛函理论中的广义梯度近似（DFT/GGA）方法,在PW91/DNP水平上研究了21种2,3-二取代喹唑啉-4（3H）-酮化合物的结构、化学活性和前线轨道.结果表明：此类化合物的能隙Eg大部分都在3.50-3.60 e V之间,其中在喹唑啉环3位上取代甲氧基苄基,或是在8位上取代甲基,化合物的能隙降低,而且甲氧基在苄基的间位比对位降低得更厉害.通过比较还发现,2,3-二取代喹唑啉-4（3H）-酮化合物对水稻纹枯菌（Rhizoctonia solani bacteria）的杀菌活性与哌啶并噻吩并嘧啶酮衍生物对水稻纹枯菌的杀菌活性相当,而哌啶并噻吩并嘧啶酮衍生物比2,3-二取代喹唑啉-4（3H）-酮化合物对苹果轮纹病（Botryospuaeria gregaria bacteria）杀菌活性好.展开更多
以2-(胺甲基)苯酚和取代苯甲醛为原料,首次以FeCl3·6H2 O为催化剂合成了一系列2,3-二取代-1,3-苯并噁嗪,所合成化合物的结构用IR、1 H NMR、13 C NMR进行了分析与鉴定.采用离体法初步测试了目标化合物的杀菌活性,大部分化合物具有...以2-(胺甲基)苯酚和取代苯甲醛为原料,首次以FeCl3·6H2 O为催化剂合成了一系列2,3-二取代-1,3-苯并噁嗪,所合成化合物的结构用IR、1 H NMR、13 C NMR进行了分析与鉴定.采用离体法初步测试了目标化合物的杀菌活性,大部分化合物具有良好的杀菌活性,化合物3c对灰霉病菌的抑制率为86.8%,3f对纹枯病菌的抑制率为87.7%.展开更多
基金National Natural Science Foundation of China(No.22101133)Natural Science Foundation of Jiangsu Province(No.BK20200768)and Nanjing Forestry University are greatly acknowledged.
文摘An efficiently catalytic method toward the synthesis of indolin-2-ones featuring an allylic derived C_(3)-quaternary stereocenter via an intramolecular Heck cyclization/Suzuki coupling of N-substituted-N-(2-bromophenyl)acrylamides and organoboron reagents was successfully developed by using a 1,3-bis(2,6-diisopropylphenyl)acenaphthoimidazol-2-ylidene(AnIPr)-ligated oxazoline palladacycle.It enabled a very broad substrate scope tolerating different functional groups,electronic properties and steric bulkiness.Notably,it revealed a great potential to build diverse heterocycle-fused indoline alkaloids via the same intermediate 3-allyl-1,3-dimethylindolin-2-one.
基金supported by the National Natural Science Foundation of China(21390400)
文摘A highly diastereoselective and enantioselective Michael addition/desymmetrization reaction of maleimides with prochiral 3-substituted phthalides catalyzed by quinine-derived bifunctional thiourea was realized. A broad range of the 3,3′-disubstituted phthalides bearing vicinal quaternary-tertiary stereogenic centers were synthesized in moderate to good yields(up to 96%) with high diastereoselectivities(up to >19:1 dr) and enantioselectivities(up to 96:4 er).
基金the National Natural Science Foundation of China(No.22001034)Jiangxi Provincial Natural Science Foundation(No.20212BAB213001).
文摘A H_(4)SiW_(12)O_(40)-catalyzed three-component tandem reaction of 2-acylbenzoic acids,primary amines and phosphine oxides to form 3,3-disubstituted isoindolinones was developed.By employing A H_(4)SiW_(12)O_(40)as the catalyst and dimethyl carbonate(DMC)as the solvent,a diverse range of 2-acylbenzoic acid derivatives and primary amines worked well to give the C3-phosphinoyl-functionalized 3,3-disubstituted isoindolinones with the yield range of 61%-87%.Advantages of this transformation include green catalyst and solvent,available starting materials,broad substrate scope,high efficiency and operational simplicity with water as the sole by-product.The strategy achieved an efficient and green molecular fragment assembly to access isoindolinones,which would provide opportunities for the synthesis of potential biologically active molecules in a green manner.
基金supported by the National Natural Science Foundation of China(22171186,22222107)ShanghaiTech University Start-up FundingAnalytical Instrumentation Center(#SPSTAIC10112914),SPST,ShanghaiTech University。
文摘A novel kinetic resolution(KR) method has been developed for 3,3-disubstituted indolines, whose catalytic asymmetric synthesis remains a significant challenge in organic synthesis. The key to the success of this KR protocol lies in the utilization of chiral phosphoric acid-catalyzed triazane formation reaction with azodicarboxylates, which enables the enantioselective synthesis of various substituted indolines bearing C3-quaternary stereocenters with good to high enantioselectivities(with sfactors up to 70). Moreover, an intriguing parallel kinetic resolution(PKR) has been developed by combining triazane formation and dehydrogenation reactions using different azodicarboxylates. Experimental studies have provided insight into the mechanism of this PKR reaction, demonstrating stereoselectivity in both triazane formation and dehydrogenation steps, favoring the opposite enantiomers. The large-scale synthesis and diverse derivatizations of the products, particularly the imine groupcontaining 3H-indoles, demonstrate the value of these(P)KR methods.
基金The authors are grateful for the support from the Na-tional Natural Science Foundation of China （No. 21073058）, the Research Fund for the Doctoral Program of Higher Education of China （20100074110014）, and the Fundamental Research Funds for the Central Uni-versities.
文摘The calcined Mg-A1 layered double hydroxides （LDHs） with a Mg/A1 molar ratio of 3 ： 1 were synthesized and characterized thoroughly by X-ray diffraction （XRD）, temperature-programmed desorption （TPD） of CO2, and thermogravimetric analysis （TGA）. Thus the calcined Mg-A1 LDHs were used as catalyst for the catalytic synthesis of disubstituted ureas from amines and CO2. The effects of reaction time, reaction temperature, pressure, solvent and calcined temperature on activity have been investigated. The results indicated that aliphatic amines, cyclo- hexylamine and benzylamine can be converted to the corresponding ureas selectively over the calcined Mg-A1 LDHs catalysts with N-methyl-2-pyrrolidone （NMP） as solvent without using any dehydrating regent. The catalyst can be recycled several times with only slight loss of activity.
文摘,3-Disubstituted quinoxalines were synthesized from α-acetylthioformanilide and ophenylenediamine. Further studies sliowed that there existed competitive re- actions. One was a condensation reaction which produced substituted quinoxaline and the other was a substitution reaction which produced substituted quinoxaline-2- thione.
文摘An efficient and easy method for one-pot three-component synthesis of l,3-disubstituted-3H-benzo[f]chromenes by the condensation of naphtol,aromatic aldehyde derivatives and phenylacetylene in the presence of ferric hydrogensulfate[Fe（HSO4）3], has been described.The catalyst displayed high activity which afforded the corresponding 1,3-disubstituted-3H-benzo[f]chromenes in satisfying yields.Alkyl-substituted phenols were examined and the corresponding benzopyran derivatives were synthesized in moderate yields.Heterogeneous nature of the using catalyst made it reusable for further chemical reactions.
文摘以2-(胺甲基)苯酚和取代苯甲醛为原料,首次以FeCl3·6H2 O为催化剂合成了一系列2,3-二取代-1,3-苯并噁嗪,所合成化合物的结构用IR、1 H NMR、13 C NMR进行了分析与鉴定.采用离体法初步测试了目标化合物的杀菌活性,大部分化合物具有良好的杀菌活性,化合物3c对灰霉病菌的抑制率为86.8%,3f对纹枯病菌的抑制率为87.7%.
