Direct ortho-C–H Functionalization of Aromatic Alcohols Masked by Acetone Oxime Ether via exo-Palladacycle
摘要:
Use of an iridium catalyst allowed the efficient dehydrogenative functionalization of C-H bonds of azulenes with the production of hydrogen as the sole byproduct. The reaction occurred with excellent chemo- and regioselectivities to provide 2-silylazulenes even without any directing groups. Effective conjugation through the 2-position of the azulene ring was demonstrated by the unique stimuli-responsiveness against an acidbase reaction.
Biaryls, which contained a benzyloxy motif, were directly constructed through a ligand‐promoted PdII‐catalyzed ortho‐arylation of masked aromatic alcohols. A variety of acetoxime ethers could be coupled with a diverse range of arylboronic acid pinocol esters, giving direct access to bioactive biaryls in modest to good yield. Not only could acetoxime be subsequently removed without a separation, functionalized
elucidation of the titled compounds was performed by using 1H NMR and 13C NMR spectroscopy as well as mass spectrometry. The presented method of synthesis for oxime ethers is environmentally friendly, because neither water cooling or heating of the reaction mixture/solvents (necessary for chromatographic purification) is required. The synthesis can be carried out very easily on a large scale.
在这项研究中,我们提出了一种简便的合成肟醚的方法,该方法是使肟与各种氯化物(烷基,官能化的烷基和苄基)反应,然后在DMSO中使用超碱化的氢氧化钾。反应在室温下进行,并以高收率获得产物。在2分钟至3小时内收到最终产品。另外,该化合物不需要色谱分离。通过1 H NMR和13 H进行标题化合物的结构解析13 C NMR光谱以及质谱。所提出的肟醚的合成方法是环境友好的,因为不需要水冷却或加热反应混合物/溶剂(色谱纯化所必需)。合成可以非常容易地大规模进行。
FUNGICIDAL OXIMES AND HYDRAZONES
申请人:Hanagan Mary Ann
公开号:US20130030002A1
公开(公告)日:2013-01-31
Disclosed are compounds of Formula 1, including all stereoisomers, N-oxides, and salts thereof,
wherein
E, X, G, W
2
and Z are as defined in the disclosure.
Also disclosed are compositions containing the compounds of Formula 1 and methods for controlling plant disease caused by a fungal pathogen comprising applying an effective amount of a compound or a composition of the invention.
Also disclosed are compounds of Formula 1A including all stereoisomers, N-oxides, and salts thereof,
wherein
E, X, G and Z
1
are as defined in the disclosure.
Also disclosed is the use of the compounds of Formula 1A as intermediates for preparing compounds of Formula 1.