已经制备了一系列甲form桥接的P 2 N 2笼。在去质子化时,这些化合物充当杂合的N-杂环卡宾配体的有价值的前体,而直接金属化由于甲am桥的裂解而产生了重排的双金属配合物。后者的金属络合物包含完整的环磷氮烷部分,该环磷氮烷部分以单齿和螯合方式配位两个不同的金属中心。已经进行了计算研究以阐明P 2 N 2内的键合框架以及反应模式。天然键轨道分析表明,笼状基序很难被局部的Lewis结构描述,负超共轭效应决定了双环骨架的稳定性。通过检查前沿分子轨道评估了环磷氮烷单元的供体容量,突显了一个事实,即金属碎片的π返给对有效的金属-配体结合至关重要。
已经制备了一系列甲form桥接的P 2 N 2笼。在去质子化时,这些化合物充当杂合的N-杂环卡宾配体的有价值的前体,而直接金属化由于甲am桥的裂解而产生了重排的双金属配合物。后者的金属络合物包含完整的环磷氮烷部分,该环磷氮烷部分以单齿和螯合方式配位两个不同的金属中心。已经进行了计算研究以阐明P 2 N 2内的键合框架以及反应模式。天然键轨道分析表明,笼状基序很难被局部的Lewis结构描述,负超共轭效应决定了双环骨架的稳定性。通过检查前沿分子轨道评估了环磷氮烷单元的供体容量,突显了一个事实,即金属碎片的π返给对有效的金属-配体结合至关重要。
Multicomponent Synthesis of 1-Aryl 1,2,4-Triazoles
作者:Annie Tam、Ian S. Armstrong、Thomas E. La Cruz
DOI:10.1021/ol401428x
日期:2013.7.19
A multicomponent (single reactor) process for the synthesis of 1-aryl 1,2,4-triazoles was explored and developed. This transformation prepared the 1,2,4-triazole directly from anilines, amino pyridines, and pyrimidines. The reaction scope was explored with 21 different substrates, and the position of the nitrogen atoms in the newly formed ring was established by 15N labeling and NMR spectroscopy.
Formamidino and carbamoyl-formamidino complexes of manganese and rhenium carbonyls
作者:Edward W. Abel、Stephen J. Skittrall
DOI:10.1016/s0022-328x(00)83511-1
日期:1980.2
Lithio-1,3-diarylformamidines undergo reaction with the monomeric and dimericcarbonyl chlorides of manganese and rhenium, [M(CO)5Cl] and [M(CO)4Cl2] to yield respectively the carbamoyl-formamidino [M(CO)4-CON(R)CHNR] and the formamidino [M(CO)4RNCHNR] types of complex. The carbamoyl complexes undergo decarbonylation to produce the formamidino complexes in low yield.
Lithio-1,3-二芳基甲am与锰和rh的[M(CO)5 Cl]和[ M(CO)4 Cl 2 ]的单体和二聚羰基氯化物反应,分别生成氨基甲酰基-甲酰胺基[M(CO )4 - CON(R)CH = NR ]和甲酰胺基[M(CO)4 RNCH = NR ]类型的复合物。氨基甲酰基复合物进行脱羰作用以低产率生产甲酰胺基复合物。
A modular approach to neutral P,N-ligands: synthesis and coordination chemistry
作者:Vladislav Vasilenko、Torsten Roth、Clemens K Blasius、Sebastian N Intorp、Hubert Wadepohl、Lutz H Gade
DOI:10.3762/bjoc.12.83
日期:——
We report the modular synthesis of three different types of neutral kappa(2)-P,N-ligands comprising an imine and a phosphine binding site. These ligands were reacted with rhodium, iridium and palladium metal precursors and the structures of the resulting complexes were elucidated by means of X-ray crystallography. We observed that subtle changes of the ligand backbone have a significant influence on
Evaluation of Electrophilic Heteroaromatic Substitution: Synthesis of Heteroaromatic-Fused Pyrimidine Derivatives via Sequential Three-Component Heterocyclization
作者:Fung Fuh Wong、Yu-Ying Huang、Chun-Hsi Chang
DOI:10.1021/jo301463m
日期:2012.10.5
A new sequentialthree-componentheterocyclization was developed by reacting aromatic and heterocyclic substrates, including aminobenzenes, 1-aminonaphthalene, 2-aminopyrazines, 5-aminopyrazoles, 3-aminopyridine, 5-aminopyrimidine, 5-aminoquinoline, and 8-aminoquinoline, with formamide in the presence of PBr3. The reaction gave the corresponding pyrazolo[3,4-d]pyrimidines in good yields (59–96%), except
通过使芳香族和杂环底物(包括氨基苯,1-氨基萘,2-氨基吡嗪,5-氨基吡唑,3-氨基吡啶,5-氨基嘧啶,5-氨基喹啉和8-氨基喹啉)与甲酰胺反应,开发了一种新的顺序三组分杂环化方法在PBr 3存在下。除氨基苯和3-氨基吡啶外,该反应以较高的收率(59-96%)得到了相应的吡唑并[3,4- d ]嘧啶。提出了包括三步酰胺化,亲电取代亚胺化和氧化环化的合理反应机理,以解决杂环化问题。发现反应的反应性与芳族或杂环底物的亲电子性成比例。
Reactions of Aryliminodimagnesium with Some<i>N</i>,<i>N</i>-Dimethylcarboxamides and Benzonitriles Affording Various Types of Amidines. Correction of Previous Results on Formamidine Formation from<i>N</i>,<i>N</i>-Dimethylformamide
Some symmetrical and unsymmetrical form- and benzamidines were prepared by the reaction of ArN(MgBr)2 with Ar’CN, HCONMe2 and related compounds in tetrahydrofurn.