Reduction of Weinreb amides to aldehydes under ambient conditions with magnesium borohydride reagents
作者:Christopher L. Bailey、Jacob W. Clary、Chittreeya Tansakul、Lucas Klabunde、Christopher L. Anderson、Alexander Y. Joh、Alexander T. Lill、Natalie Peer、Rebecca Braslau、Bakthan Singaram
DOI:10.1016/j.tetlet.2014.12.066
日期:2015.1
[H3BNMe2]−, MgAB) is an analogue of the versatile lithium dialkylaminoborohydrides (LAB reagents), prepared by the reaction of dimethylamine-borane with methylmagnesium chloride. MgAB is a partial reducing agent for Weinrebamides under ambient conditions and is complementary to the commonly utilized lithium aluminum hydride (LiAlH4) and diisobutylaluminum hydride (DIBAL) reagents, while exhibiting enhanced
of iminyl radical‐triggered 1,5‐hydrogen atom transfer and (5+2) or (5+1) annulation processes, a series of structurally novel and interesting azepine and spiro‐tetrahydropyridine derivatives have been successfully prepared in moderate to good yields. This method utilizes FeCl2 as the catalyst and readily available oximes as five‐atom units, while showcasing broad substrate scope and good functional
three-component 1,4-carboamination of dienes is described. Synthetically versatile Weinreb amides were coupled with 1,3-dienes and readily available dioxazolones as the nitrogen source using [Cp*RhCl2 ]2 -catalyzed C-H activation to deliver the 1,4-carboaminated products. This transformation proceeds under mild reaction conditions and affords the products with high levels of regio- and E-selectivity. Mechanistic
Iridium-Catalyzed C–H Amination of Weinreb Amides: A Facile Pathway toward Anilines and Quinazolin-2,4-diones
作者:Xunqing Dong、Panpan Ma、Tao Zhang、Hitesh B. Jalani、Guigen Li、Hongjian Lu
DOI:10.1021/acs.joc.0c01789
日期:2020.10.16
C–H amination of arenes directed by weakly coordinating Weinreb amides has been achieved with an iridium catalyst and 2,2,2-trichloroethoxycarbonyl (Troc) azide as an aminating agent, providing a robust method of producing synthetic useful ortho-TrocNH aryl Weinreb amides. Taking advantage of the reactivity of Weinreb amide and Troc groups in the amination products, selective hydrolysis was achieved
Palladium-Catalyzed Coupling Reactions of N-Methoxy-N-methylcarbamoyl Chloride for the Synthesis of N-Methoxy-N-methylamides
作者:Masahiro Murakami、Yujiro Hoshino、Hajime Ito、Yoshihiko Ito
DOI:10.1246/cl.1998.163
日期:1998.2
A new synthetic method of N-methoxy-N-methylamides is developed. The palladium-catalyzedcouplingreaction of N-methoxy-N-methylcarbamoyl chloride furnished N-methoxy-N-methylamide in moderate to good yield, wherein a carbonyl equivalent was appended to sp and sp2 carbon atoms as a versatile synthetic basis for further manipulation.