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
作者:Justin A. Hilf、Michael S. Holzwarth、Scott D. Rychnovsky
DOI:10.1021/acs.joc.6b01370
日期:2016.11.4
Pyridine rings are common structural motifs found in a number of biologically active compounds, including some top-selling pharmaceuticals. We have developed a new approach to access substituted pyridines. The method aims to provide a reliable synthesis of a diverse range of substituted pyridines through a three-step procedure. Readily available enones are first converted into 1,5-dicarbonyls through
Modular Pyridine Synthesis from Oximes and Enals through Synergistic Copper/Iminium Catalysis
作者:Ye Wei、Naohiko Yoshikai
DOI:10.1021/ja312346s
日期:2013.3.13
ketoximes and α,β-unsaturated aldehydes that is synergistically catalyzed by a copper(I) salt and a secondary ammonium salt (or amine). This redox-neutral reaction allows modular synthesis of a variety of substituted pyridines under mild conditions with tolerance of a broad range of functional groups. The reaction is driven by a merger of iminium catalysis and redox activity of the copper catalyst, which
我们在此描述了由铜(I)盐和仲铵盐(或胺)协同催化的 O-乙酰基酮肟和 α,β-不饱和醛的 [3+3] 型缩合反应。这种氧化还原中性反应允许在温和条件下模块化合成各种取代的吡啶,并具有广泛的官能团耐受性。该反应由亚胺催化和铜催化剂的氧化还原活性的结合驱动,最初会还原肟 NO 键以生成亲核铜 (II) 烯酰胺,然后将二氢吡啶中间体氧化为吡啶产物。