PdCl2(dppf)-catalyzed in situ coupling of 2-hydroxypyridines with aryl boronic acids mediated by PyBroP and the one-pot chemo- and regioselective construction of two distinct aryl–aryl bonds
作者:Shui-Ming Li、Jie Huang、Guo-Jun Chen、Fu-She Han
DOI:10.1039/c1cc15753a
日期:——
of 2-arylated pyridine derivatives via the in situ coupling of 2-OH pyridines and boronic acidsmediated by PyBroP. In addition, the highly chemo- and regioselective construction of two different aryl-aryl bonds via a one-pot operation has also been demonstrated by the orthogonal use of this method with the Ni-catalyzed Suzuki-Miyaura coupling of phenols.
Herein, we report a highly efficient and practical method for pyridine‐derived heterobiaryl synthesis through palladium‐catalyzed electrophilic functionalization of easily available pyridine‐derived quaternary phosphonium salts. The nice generality of this reaction was goes beyond arylation, enabling facile incorporation of diverse carbon‐based fragments, including alkenyl, alkynyl, and also allyl
Metal-Free Assembly of Polysubstituted Pyridines from Oximes and Acroleins
作者:Huawen Huang、Jinhui Cai、Lichang Tang、Zilong Wang、Feifei Li、Guo-Jun Deng
DOI:10.1021/acs.joc.5b02624
日期:2016.2.19
of N-heterocycles from oximes has been previously well established. In this paper, for the first time a metal-free protocol with the combinational employment of iodine and triethylamine has been demonstrated to be effective to trigger the oxime-based synthesis of pyridines with high chemo-selectivity and wide functional group tolerance. A broad range of functional pyridines were prepared in moderate
Synthesis of polysubstituted pyridines from oxime acetates using NH<sub>4</sub>I as a dual-function promoter
作者:Yujia Xia、Jinhui Cai、Huawen Huang、Guo-Jun Deng
DOI:10.1039/c7ob02471a
日期:——
Pyridine formation with oxime acetates as the building blocks under metal-free conditions is described. Ammonium iodide has proved to be a highly efficient promoter for oxime N–O bond reduction and subsequent condensation reactions, whereby it played a dual-function role in the transformation. While the three-component reaction of oxime acetates, benzaldehydes, and 1,3-dicarbonyls proceeded well with
A new approach to pyridines through the reactions of methyl ketones with 1,2,4-triazines
作者:Shu-Wen Wang、Wei-Si Guo、Li-Rong Wen、Ming Li
DOI:10.1039/c4ra11294f
日期:——
A new route to prepare pyridine derivatives based on inverse electron demand Diels–Alder/retro-Diels–Alder reactions of ketones with 1,2,4-triazines is reported. It is the first time using methylketones directly as a dienophile to react with 1,2,4-triazines without enamine intermediates, which is complementary to the classical Boger reaction.