An (Aminopyrimidinato)titanium Catalyst for the Hydroamination of Alkynes and Alkenes

Brahms, Christian; Tholen, Patrik; Saak, Wolfgang; Doye, Sven

doi:10.1002/ejoc.201301004

Cited by 31 publications

(16 citation statements)

References 44 publications

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“…The difference between bond lengths was due to distinction between the kinds of bonds. The bond angle N 21 -Ge 1 -N 11 (62.550º) was very close to the data that had been reported earlier (62.29º-61.00º) [18][19][20]. The calculations supported the structure of aminopyrimidine Ge(II) compounds with four-coordinate fashion and ten electrons.…”

Section: Resultssupporting

confidence: 86%

“…The approach was supported by earlier publications [18] on a four-member ring structure of aminopyrimidinato Cd(II) compounds (Scheme 2, parts a, b) and [19] devoted to four-member ring structure of aminopyrimidinato titanium compound and its catalytic activity. Previously we had synthesized some aminopyrimidine Ge(II) complexes [20] that could be excellent precursors for making Ge thin films.…”

Section: Introductionmentioning

confidence: 76%

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Theoretical research on structures of aminopyrimidine germanium(II) precursors and their application in film formation

Wang

Song

et al. 2015

Russ J Gen Chem

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Structures of aminopyrimidine Ge(II) precursors have been elucidated by density functional theory calculations. Calculation data indicated that the structure of aminopyrimidine Ge(II) compounds was fourcoordinate with ten electrons. Thin film of Ge was deposited on Si wafer directly by means of home-made equipment and chemical vapor deposition technology. Aminopyrimidine Ge(II) precursors had excellent thermal properties and were suitable for potential membrane materials.

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Section: Resultssupporting

confidence: 86%

Section: Introductionmentioning

confidence: 76%

Theoretical research on structures of aminopyrimidine germanium(II) precursors and their application in film formation

Wang

Song

et al. 2015

Russ J Gen Chem

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“…8b: 1 H NMR (CDCl 3 , 500 MHz): δ = 0.95 (t, J = 7.4 Hz, 3 H), 1.76–1.89 (m, 2 H), 2.18 (s, 3 H), 4.20 (t, J = 6.7 Hz, 1 H), 6.44 (d, J = 8.4 Hz, 2 H), 6.89 (d, J = 8.1 Hz, 2 H), 7.19–7.23 (m, 1 H), 7.25–7.27 (m, 1 H), 7.28–7.36 (m, 4 H) ppm. 13 C NMR (CDCl 3 , DEPT, 125 MHz): δ = 10.9 (CH 3 ), 20.5 (CH 3 ), 31.8 (CH 2 ), 60.2 (CH), 113.5 (CH), 126.4 (CH), 126.7 (C), 126.9 (CH), 128.6 (CH), 129.7 (CH), 144.3 (C), 145.4 (C) ppm.…”

Section: Methodsmentioning

confidence: 99%

“…The combined organic layers were dried with MgSO 4 and, after concentration under vacuum, the residue was purified by flash chromatography (SiO 2 , light petroleum ether/EtOAc = 20:1) to give the products as yellow liquids. 8a: [16] 1 H NMR (CDCl 3 , 500 MHz): δ = 1.28 (d, J = 6.3 Hz, 3 H), 2.40 (s, 3 H), 2.82 (dd,J = 7.3 Hz,13.3 Hz, 1 H), 3.07 (dd,J = 4.6 Hz,13.3 Hz, 1 H), 3.49 (br. s, 1 H), 3.86-3.89 (m, 1 H), 6.71 (d,J = 8.2 Hz,2 H),7.16 (d,J = 8.0 Hz,2 H),3 H),7.44 (t,J = 7.4 Hz, 2 H) ppm.…”

Section: Complexmentioning

confidence: 99%

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New Titanium Complexes and Their Use in Hydroamination and Hydroaminoalkylation Reactions

et al. 2019

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The synthesis of three new sterically crowded titanium complexes which all possess an identical formamidinato ligand, two dimethylamido ligands and in addition, a 2‐aminopyridinato ligand that contains either an N‐methyl, an N‐phenyl, or an N‐cyclohexyl substituent is presented. All new complexes are easily accessible from a common titanium mono(formamidinate) precursor and correspondingly N‐substituted 2‐aminopyridines. Furthermore, the new complexes are used as catalysts for selected hydroamination and hydroaminoalkylation reactions and finally, the catalytic performance of the new catalysts is compared with the performance of the titanium mono(formamidinate) precursor.

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Hydroamination of Alkenes

Reznichenko

Hultzsch

2015

Organic Reactions

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The addition of an amine NH‐functionality to alkenes (including vinyl arenes, conjugated dienes, allenes or ring‐strained alkenes), the so‐called hydroamination, represents a simple and highly atom‐economical approach for the synthesis of nitrogen‐containing products. A large variety of catalyst systems are available, ranging from alkali, alkaline earth, rare earth, Group 4 and Group 5 metals, to late transition metal catalysts, and, less prominent, Brønsted and Lewis acid‐based catalyst systems. The mode of operation of these catalyst systems can vary significantly and the different reaction mechanisms and the scope and limitations are discussed. While intramolecular hydroamination reactions can be readily achieved with a large number of catalyst systems, significantly fewer examples for the more challenging intermolecular hydroamination are known, especially for unactivated alkenes. The stereoselective hydroamination has also received significant attention due to the importance of chiral nitrogen‐containing molecules in pharmaceutical industry. A variety of highly selective chiral catalyst systems have been developed for intramolecular hydroaminations, while examples of intermolecular asymmetric hydroaminations are scarce. Hydroamination in the context of this review article is defined as the addition of HNR 2 across a non‐activated, unsaturated carbon‐carbon multiple bond. This review focuses on the hydroamination reaction of simple, non‐activated alkenes. The addition of amines to slightly activated alkenes, such as vinyl arenes, 1,3‐dienes, strained alkenes (norbornene derivatives, methylenecyclopropenes) and allenes is closely related and is covered as well. However, hydroamination reactions of alkynes and Aza‐Michael reactions involving the addition of an N‐H fragment across the conjugated or otherwise activated double bond of a Michael acceptor are not covered. The scope of amine types includes ammonia, primary and secondary aliphatic and aromatic amines, azoles, and hydrazines. N ‐Protected amines, such as ureas, carboxamides, and sulfonamides are covered as well, as they are important substrates for metal‐free and late transition metal‐based catalysts. The literature through January 2011 will be covered with two selected references from 2012 (comprising Table 3D). A supplemental reference list is provided for reports appearing February 2011 through April 2015. The chapter is organized by the nature of the carbon unsaturation to which the amine is added. Ranging from less reactive substrates such as ethylene and unactivated alkenes, to slightly activated substrates, such as vinyl arenes, and more activated substrates, including conjugated dienes, allenes and strained alkenes. Enantioselective hydroamination reactions, an area that has seen significant progress over the past decade, are discussed next. Finally, tandem hydroamination/carbocyclization reactions of aminodialkenes provide rapid access to complex alkaloidal skeletons. The tables at the end of the chapter are separated into five main sections: achiral intermolecular hydroamination, achiral intramolecular hydroamination, enantioselective intermolecular hydroamination, enantioselective intramolecular hydroamination, and tandem hydroamination/carbocyclization. Within the first four sections the tables are further divided into subsections based on the participating alkene, i.e. alkenes, vinyl arenes, dienes, allenes, and strained alkenes.

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An (Aminopyrimidinato)titanium Catalyst for the Hydroamination of Alkynes and Alkenes

Cited by 31 publications

References 44 publications

Theoretical research on structures of aminopyrimidine germanium(II) precursors and their application in film formation

Theoretical research on structures of aminopyrimidine germanium(II) precursors and their application in film formation

New Titanium Complexes and Their Use in Hydroamination and Hydroaminoalkylation Reactions

Hydroamination of Alkenes

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