Synthesis and reduction reactions of pyridones and 5-acyl-2-methoxypyridines
摘要:
The synthesis of a series of pyridones, from their 2-hydroxypyridine or 2-methoxypyridine precursors, is described, along with studies into their reductions to saturated heterocycles. A number of 5-acylpyridones were prepared and were evaluated as substrates for asymmetric transfer hydrogenation prior to conversion to saturated heterocycles. The enantioselective reduction of 5-acetyl-1-benzylpyrimidine-2,4(1H,3H)-dione is also described. (C) 2014 Elsevier Ltd. All rights reserved.
General Method for the Suzuki–Miyaura Cross-Coupling of Primary Amide-Derived Electrophiles Enabled by [Pd(NHC)(cin)Cl] at Room Temperature
作者:Peng Lei、Guangrong Meng、Yun Ling、Jie An、Steven P. Nolan、Michal Szostak
DOI:10.1021/acs.orglett.7b03191
日期:2017.12.15
temperature Suzuki–Miyauracross-coupling of commonly encountered primary benzamides is reported. A combination of site-selective N,N-di-Boc-activation (tert-butoxycarbonyl activation) of the amide nitrogen with practical air- and moisture-stable, well-defined, and highly reactive [Pd(NHC)(cin)Cl] (NHC = N-heterocyclic carbene; cin = cinnamyl) provides a highly effective route to biarylketones from primary
Acylboronates in Polarity-Reversed Generation of Acyl Palladium(II) Intermediates
作者:Alina Trofimova、Aleksandra Holownia、Chieh-Hung Tien、Martynas J. Širvinskas、Andrei K. Yudin
DOI:10.1021/acs.orglett.1c00742
日期:2021.5.7
process between aryl (pseudo)halides and boron-based acyl anion equivalents. This mode of acylboronate reactivity represents polarity reversal, which is supported by the observation of tetracoordinated boronate and acyl palladium(II) species by 11B, 31P NMR, and massspectrometry. A broad scope of aliphatic and aromatic acylboronates has been examined, as well as a variety of aryl (pseudo)halides.
我们报告芳基(假)卤化物和硼基酰基阴离子当量之间的催化交叉偶联过程。酰基硼酸酯反应性的这种模式表示极性反转,这通过11 B,31 P NMR和质谱观察到四配位的硼酸酯和酰基钯(II)物种得到支持。已经研究了广泛范围的脂族和芳族酰基硼酸酯,以及各种芳基(假)卤化物。
The direct, highly chemoselective Suzuki–Miyaura cross-coupling of trifluoromethanesulfonamides (triflamides) by selective N–C(O) amide bond cleavage is reported. This operationally simple, mild, and user-friendly method accomplishes the direct synthesis of ketones from amides by a catalytic manifold as a powerful alternative to Weinreb amides. Mechanistic studies support rotational inversion and electronic
Heteroaryl manganese reagents: direct preparation and reactivity studies
作者:Reuben D. Rieke、YoungSung Suh、Seung-Hoi Kim
DOI:10.1016/j.tetlet.2005.06.092
日期:2005.8
Direct preparation of various heteroaryl manganese reagents was performed by using highly active manganese (Mn∗) and heteroaryl halides. The resulting organomanganese reagents were coupled with electrophiles such as aryl halides, vinyl halides, and benzoyl chlorides under mild reaction conditions. The corresponding coupling products were obtained in good yields.