环吡啶鎓盐的 Ir 催化不对称氢化是一种方便有效合成手性吲哚里西啶的新策略。在[Ir(cod)Cl] 2和( R )-DM-SegPhos存在下,衍生自2-(2-酰基苯基)吡啶的环状吡啶鎓盐的不对称氢化反应顺利进行,得到所需的手性7,8-苯并吲哚里西啶6具有中等对映选择性(高达 86:14 er)和出色的非对映选择性(>20:1 dr),收率高至极好。通过重结晶,6j的对映体纯度提高到92:8。
Direct Carbo-Acylation Reactions of 2-Arylpyridines with α-Diketones via Pd-Catalyzed C–H Activation and Selective C(sp2)–C(sp2) Cleavage
摘要:
An efficient carbo-acylation reaction of 2-arylpyridines with alpha-diketones via Pd-catalyzed C-H bond activation and C-C bond cleavage in the presence of TBHP was developed that generated aryl ketones in good yields. The highly selective formation of aryl ketones was observed when 2-arylpyridines reacted with aromatic/aliphatic alpha-diketones.
Palladium-catalyzed decarboxylative, decarbonylative and dehydrogenative C(sp<sup>2</sup>)–H acylation at room temperature
作者:Asik Hossian、Manash Kumar Manna、Kartic Manna、Ranjan Jana
DOI:10.1039/c7ob01466j
日期:——
ambient temperature. A novel decarbonylative C–H acylation reaction has also been accomplished using aryl glyoxals as acyl surrogates. Finally, a practical C–H acylation via a dehydrogenative pathway has been demonstrated using commercially available benzaldehydes and aqueous hydroperoxides. We also disclose that acetonitrile solvent is optimal for the acylation reaction at room temperature and has a prominent
Decarboxylative acylation of arenes with mandelic acid derivatives via palladium-catalyzed oxidative sp<sup>2</sup> C–H activation
作者:Xia Liu、Ze Yi、Jianhui Wang、Guiyan Liu
DOI:10.1039/c4ra14107e
日期:——
An efficient palladium catalyzed decarboxylative acylation of arenes with mandelic acid derivatives via oxidative sp2 C–H activation in the presence of tert-butyl hydroperoxide has been developed. The acylation reaction is assisted by a pyridine directing group. The starting materials are inexpensive and readily available. This method provides an economical and convenient way to synthesize aryl ketones
A palladium-catalyzeddirect access to ketones from aldehydes via C−H cleavage of arenes is described. The procedure utilizes air as a clean and free terminal oxidant.
描述了钯催化经由芳烃的CH裂解从醛类直接通往酮的方法。该程序利用空气作为清洁和游离的终端氧化剂。
Palladium-Catalyzed Oxidative Synthesis of Aromatic Ketones Using Olefins as Acyl Equivalents through Selective<i>ortho</i>Aromatic C-H Bond Activation
作者:Ashok B. Khemnar、Bhalchandra M. Bhanage
DOI:10.1002/ejoc.201402782
日期:2014.10
selective ortho-acylation of arenes by oxidative C–H bond activation using a palladium catalyst. Olefins were oxidized to the corresponding aldehydes/benzoyl radicals, which, on coupling with 2-phenylpyridine, gave the corresponding acylated products in good to excellent yields. 1-Phenylpyrazole also reacts with substituted olefins to give the acylation products in good yields.
Palladium-catalyzed ortho-acylation of 2-aryl pyridine derivatives using arylmethyl amines as new acyl sources
作者:Qian Zhang、Fan Yang、Yangjie Wu
DOI:10.1039/c3cc42106f
日期:——
A facile and efficient protocol for palladium-catalyzed ortho-acylation of 2-aryl pyridines was developed. Note that this acylation utilized arylmethyl amines as new, cheap and readily available acylation reagents and exhibited high regioselectivity for 2-aryl pyridines bearing a meta-substituent in the aryl ring moiety.