Selective Conversion of Diallylanilines and Arylimines to Quinolines
摘要:
A variety of diallylanilines are shown to undergo cobalt-carbonyl catalyzed rearrangement to quinolines. Diallylanilines are also used as allyl transfer reagents to convert benzaldimines into quinolines. Substitution in the 2- and 3-positions of the quinoline is featured in all transformations.
Concise synthesis of aromatic tertiary amines via a double Petasis–borono Mannich reaction of aromatic amines, formaldehyde, and organoboronic acids
作者:Jiayi Wang、Pinzhen Li、Qiaoying Shen、Gonghua Song
DOI:10.1016/j.tetlet.2014.03.131
日期:2014.7
A simple and efficient strategy to construct aromatictertiary amines via a double Petasis–borono Mannich reaction of aromatic amines, formaldehyde, and organoboronic acids has been developed. The transformation provides a useful method for the synthesis of amine derivatives.
Allylic Amination via Decarboxylative C-N Bond Formation
作者:Jon A. Tunge、Shelli R. Mellegaard-Waetzig、Dinesh Kumar Rayabarapu
DOI:10.1055/s-2005-918949
日期:——
This manuscript details the development of a palladium-catalyzed allylic amination that proceeds via decarboxylation of allylic carbamates. Both saturated and aromatic heterocycles undergo decarboxylative rearrangement in good yields. The mechanism of allylation of heteroaromatic amines involves the formation of Ï-allyl palladium complexes followed by decarboxylation of the carbamate. Finally, the heteroaromatic anion equivalent is allylated to provide allylic amines.
The direct electrophilic, nucleophilic, and amphiphilic allylations of allylic alcohol by use of a palladium catalyst and organometallic reagents such as organoborane and organozinc has been developed. The phosphine–borane compound works as the effective ligand for palladium-catalyzed direct allylic amination of allylic alcohol. Thus, with secondary amines, the reaction was completed in only 1 h, even
A new direct catalytic amination of allylic alcohols promoted by the combination of platinum and a large bite-angle ligand DPEphos was developed in which the allylic alcohol was effectively converted to a pi-allylplatinum intermediate without the use of an activating reagent. The use of the DPEphos ligand was essential for obtaining high catalyst activity and high monoallylation selectivity of primary
The (pi-allyl)palladium complex bearing an sp2-hybridized phosphorus ligand (DPCB-OMe: 1,2-bis(4-methoxyphenyl)-3,4-bis[(2,4,6-tri-tert-butylphenyl)phosphinidene]cyclobutene) efficiently catalyzes direct conversion of allylic alcohols in the absence of activating agents of alcohols such as Lewis acids. N-Allylation of aniline proceeds at room temperature to afford monoallylated anilines in 90-97% yields