Synthesis of α-Amino Nitriles from Carbonyl Compounds, Amines, and Trimethylsilyl Cyanide: Comparison between Catalyst-Free Conditions and the Presence of Tin Ion-Exchanged Montmorillonite
作者:Jiacheng Wang、Yoichi Masui、Makoto Onaka
DOI:10.1002/ejoc.200901323
日期:2010.3
In the absence of catalysts, the three-component, one-pot synthesis of α-aminonitriles proceeded using various aldehydes and ketones together with amines and trimethylsilyl cyanide (TMSCN) in high yields under neat conditions at room temperature. The addition order of the reagents had a significant influence on the yields of the desired α-aminonitriles. In contrast, when tin ion-exchanged montmorillonite
TITANIUM COMPOUNDS AND PROCESS FOR CYANATION OF IMINES
申请人:Seayad Abdul Majeed
公开号:US20110319629A1
公开(公告)日:2011-12-29
The present invention relates to titanium catalysts for synthesis reactions produced by bringing a reaction mixture comprising a titanium alkoxide and a ligand in contact with water, wherein the ligand is represented by the general formula (e): wherein R
1
, R
2
, R
3
, and R
4
are independently a hydrogen atom, an alkyl group, or the like, and (A) represents a group with two or more carbon atoms. The titanium catalysts may be isolated in solid form and may be stored. The invention further relates to a process for cyanation of imines, wherein the process comprises reacting an imine with a cyanating agent in the presence of the titanium catalyst.
Fe
<sub>3</sub>
O
<sub>4</sub>
@SiO
<sub>2</sub>
nanoparticles–functionalized Cu(II) Schiff base complex with an imidazolium moiety as an efficient and eco‐friendly bifunctional magnetically recoverable catalyst for the Strecker synthesis in aqueous media at room temperature
作者:Milad Kazemnejadi、Seyyedeh Ameneh Alavi G.、Zinat Rezazadeh、Mohammad Ali Nasseri、Ali Allahresani、Mohsen Esmaeilpour
DOI:10.1002/aoc.5388
日期:2020.2
Cu(II) Schiff base complex supported on Fe3O4@SiO2 nanoparticles was employed as a magnetic nanocatalyst (nanocomposite) with a phase transfer functionality for the one‐pot preparation of α‐aminonitriles (Streckerreaction). The desired α‐aminonitriles were obtained from the reaction of aromatic or aliphatic aldehydes, aniline or benzyl amine, NaCN, and 1.6 mol% of the catalyst in water at room temperature
Fe 3 O 4 @SiO 2上负载的Cu(II)Schiff碱络合物纳米粒子被用作具有相转移功能的磁性纳米催化剂(纳米复合材料),用于一锅法制备α-氨基腈(斯特雷克反应)。所需的α-氨基腈是由芳族或脂肪族醛,苯胺或苄基胺,NaCN反应制得的,室温下在水中有1.6 mol%的催化剂,所有底物的收率均良好到极好。该催化剂的分析和仪器特性包括傅里叶变换红外光谱,X射线衍射,热重分析,核磁共振,能量色散X射线光谱,电感耦合等离子体光谱,振动样品磁强分析,动态光散射,Brunauer-埃梅特-泰勒表面积,场发射扫描电子显微镜,和透射电子显微镜分析。研究了反应机理,其中催化剂作为相变因子的性能似乎很可能。该催化剂表现出高活性,高周转频率(TOF),显着的选择性和对Strecker合成的快速性能。纳米催化剂可以容易地和快速地从具有外部磁体的反应混合物中分离出来,并且可以重复使用至少七个连续的反应循环而不会显着降低效率。
[EN] TITANIUM COMPOUNDS AND PROCESS FOR CYANATION OF IMINES<br/>[FR] COMPOSÉS DE TITANE ET PROCÉDÉ DE CYANATION DES IMINES
申请人:AGENCY SCIENCE TECH & RES
公开号:WO2010093327A1
公开(公告)日:2010-08-19
The present invention relates to titanium catalysts for synthesis reactions produced by bringing a reaction mixture comprising a titanium alkoxide and a ligand in contact with water, wherein the ligand is represented by the general formula (e), wherein R1, R2, R3, and R4 are independently a hydrogen atom, an alkyl group, or the like, and (A) represents a group with two or more carbon atoms. The titanium catalysts may be isolated in solid form and may be stored. The invention further relates to a process for cyanation of imines, wherein the process comprises reacting an imine with a cyanating agent in the presence of the titanium catalyst.
[EN] TITANIUM COMPOUNDS AND PROCESS FOR CYANATION OF IMINES<br/>[FR] COMPOSÉS DE TITANE ET PROCÉDÉ POUR LA CYANATION D'IMINES
申请人:AGENCY SCIENCE TECH & RES
公开号:WO2010093336A1
公开(公告)日:2010-08-19
The present invention relates to titanium catalysts for synthesis reactions produced by bringing a reaction mixture comprising a titanium alkoxide and a ligand in contact with water, wherein the ligand is represented by the general formula (e): wherein R1, R2, R3, and R4 are independently a hydrogen atom, an alkyl group, or the like, and (A) represents a group with two or more carbon atoms. The titanium catalysts may be isolated in solid form and may be stored. The invention further relates to a process for cyanation of imines, wherein the process comprises reacting an imine with a cyanating agent in the presence of the titanium catalyst.