Modular Preparation of 5-Halomethyl-2-oxazolines via PhI(OAc)2-Promoted Intramolecular Halooxygenation of N-Allylcarboxamides
摘要:
A new method for the construction of oxazoline moiety was detailed. Using (diacetoxyiodo)benzene (PIDA) as the reaction promoter and halotrimethylsilane as the halogen source, intramolecular halooxygenation and halothionation of N-allylcarboxamides/N-allylcarbothioamides proceeded readily, leading : to the corresponding 5-halomethyloxazolines/5-halomethylthiazolines in good to excellent isolated yields. The 5-halomethyl products could be converted to different derivatives via conventional nucleophilic substitution methods. The reactions were carried out using easily available starting materials, and did not need harsh reaction conditions. All these features made this reaction a viable method for the construction of different oxazoline and thiazoline structures.
Synthesis of Quinolines via Rh(III)-Catalyzed Oxidative Annulation of Pyridines
作者:Guoyong Song、Xue Gong、Xingwei Li
DOI:10.1021/jo201266u
日期:2011.9.16
Selective synthesis of quinolines has been achieved via oxidative annulation of functionalized pyridines with two alkyne molecules under Rh(III)-catalyzed cascade C–H activation of pyridines using Cu(OAc)2 as an oxidant. The selectivity of this reaction is oxidant-dependent, particularly on the anion of the oxidant.
Rhodium(iii)-catalyzed oxidative mono- and di-olefination of isonicotinamides
作者:Xiaohong Wei、Feng Wang、Guoyong Song、Zhengyin Du、Xingwei Li
DOI:10.1039/c2ob25773d
日期:——
[RhCp*Cl2]2 can catalyze the oxidative coupling of secondary isonicotinamides with activated olefins using Cu(OAc)2 as an oxidant. The selectivity can be controlled by the solvent. In MeCN, the mono-olefination and two-fold oxidation reaction is the major pathway, while in THF this reaction gave mostly diolefination products. In both cases, the coupled products contain an exocyclic CC bond.
Electrochemical oxidative cyclization of olefinic carbonyls with diselenides
作者:Zhipeng Guan、Yunkun Wang、Huamin Wang、Yange Huang、Siyuan Wang、Hongding Tang、Heng Zhang、Aiwen Lei
DOI:10.1039/c9gc02665g
日期:——
The tandem cyclization of olefinic carbonyls with easily accessible diselenides facilitated by electrochemical oxidation has been successfully developed, which provides an environmentally friendly method for the construction of C–Se and C–O bonds simultaneously. A series of seleno dihydrofurans and seleno oxazolines, bearing fragile heterocycles, subtle C–I bonds and supernumerary vinyl groups, were
Copper‐Catalyzed Oxidative C−H Bond Functionalization of N‐Allylbenzamide for Regioselective C−N and C−O Bond Formation
作者:Jala Ranjith、Palakodety Radha Krishna
DOI:10.1002/asia.201900192
日期:2019.5.2
Copper‐catalyzed oxidative couplings of N‐allylbenzamides for C−N and C−O bond formations have been developed through C−H bond functionalization. To demonstrate the utility of this approach, it was applied to the synthesis of β‐aminoimides and imides. To the best of our knowledge, these are the first examples in which different classes of N‐containing compounds have been directly prepared from the
N-烯丙基苯甲酰胺通过铜催化的C-N和C-O键形成的氧化偶联作用是通过C-H键功能化而开发的。为了证明该方法的实用性,将其应用于β-氨基酰亚胺和酰亚胺的合成。就我们所知,这是第一个实例,其中使用廉价的催化剂/氧化剂/碱(CuSO 4 / TBHP / Cs 2 CO 3) 系统。
Mercurial Diuretics. I. Addition of Mercuric Chloride and Secondary Amines to Allylamides<sup>1</sup>
作者:Gerhard Wendt、B. Vithal Shetty、William F. Bruce