Bidentate geometry-constrained iminopyridyl nickel-catalyzed synthesis of amines or imines via borrowing hydrogen or dehydrogenative condensation
作者:Yong Jiang、Miao Hu、Nan Sun、Baoxiang Hu、Zhenlu Shen、Xinquan Hu、Liqun Jin
DOI:10.1016/j.tetlet.2020.152604
日期:2020.12
efficient Ni-catalyzed N-alkylation of various anilines with alcohols via borrowing hydrogen is reported using a bidentate geometry-constrained iminopyridyl nickel complex as the catalyst. Substituted benzylic alcohols and short/long chain aliphatic alcohols could be applied as the alkylation sources to couple with aromatic and heteroaromatic amines to give a diverse set of N-alkylation outcomes in moderate
Preparations of Secondary Amines and .beta.-Amino Esters via Additions of Grignard and Reformatsky Reagents to Imines and by One-Pot Reactions of Primary Amines, Aldehydes, and Grignards
作者:Alan R. Katritzky、Qingmei Hong、Zhijun Yang
DOI:10.1021/jo00116a027
日期:1995.6
Additions oi. Grignard and Reformatsky reagents to imines in the presence of 1-(trimethylsilyl)benzotriazole afforded in good yields the corresponding secondary amines and p-amino esters. The procedure is general as imines containing hydrogens a to both carbon and nitrogen can be employed. Extensions of this method to include imines containing other Lewis basic centers, e.g., those derived from furan-, thiophene-, indole-, and p-methoxybenzenecarboxaldehyde, have been successful in avoiding the potential complications which could result from the use of a Lewis acid as the activating : species. The imines need not be isolated, and a one-pot method for the synthesis of secondary amines from aldehydes, primary amines, and Grignard reagents is described.
Development and Cycloaddition Reactivity of a New Class of Pyridine-Based Mesoionic 1,3-Dipole
作者:Huseyin Erguven、David C. Leitch、Evan N. Keyzer、Bruce A. Arndtsen
DOI:10.1002/anie.201609726
日期:2017.5.22
structural characterization of a new type of mesoionic 1,3-dipole, which can be generated in the one-step reaction of imines with pyridine- or quinoline-based acid chlorides. Coupling the formation of these dipoles with alkyne cycloaddition can open a general and modular route to synthesize indolizines from combinations of available and diversifiable building blocks.
Imines are important N-containing intermediates in organic synthesis. The photocatalytic production of specific iminesthroughdirect coupling of alcohols and amines under mild conditions has been widely explored. However, the reported processes are not practical due to negative factors such as low photocatalytic efficiency, involvement of non-stoichiometric raw materials, limited scope of substrates