reported as an efficient catalyst in the presence of 5 mol % of LiOtBu for the N-methylation of amines using methanol as the methylating agent at moderate conditions, following hydrogen borrowing strategy. This simple catalyst system provides selective N-monomethylation of substituted primaryanilines and sulfonamides as well as N,N-dimethylation of primary aliphatic amines in excellent yields at 40–100
Pd-Catalyzed Dehydrogenative Aryl–Aryl Bond Formation via Double C(sp<sup>2</sup>)–H Bond Activation: Efficient Synthesis of [3,4]-Fused Oxindoles
作者:Ala Bunescu、Tiffany Piou、Qian Wang、Jieping Zhu
DOI:10.1021/ol503442n
日期:2015.1.16
A Pd(0)-catalyzed double cyclization of easily available o-bromoanilides leading to strained [3,4]-fused oxindoles was developed. The reaction proceeded through a highly ordered sequence involving key carbopalladation, 1,4-Pd migration, and C(sp2)–H functionalization steps.
Enantioselective intramolecular dearomative Heck reactions have been developed by Pd-catalyzed cross-coupling of aryl halides or aryl triflates with the internal C═C bond of indoles, benzofurans, pyrroles, and furans. A variety of structurally unique spiroheterocycles and benzofused heterocycles having N/O-substituted quaternary carbon stereocenters, and exocyclic olefin moieties were afforded in moderate
[EN] BORATE COMPOUND, AND SYNTHESIS METHOD THEREFOR AND USES THEREOF<br/>[FR] COMPOSÉ DE BORATE ET PROCÉDÉ DE SYNTHÈSE ET UTILISATIONS DE CE COMPOSÉ<br/>[ZH] 一种硼酸酯化合物、其合成方法及其用途