抽象的 在室温下,在MCM-41锚定的双齿2-氨基乙基氨基铜(II)催化剂[MCM-41-2N-在空气作为氧化剂的情况下,Cu(OAc)2 ]可以产生各种各样的[1,2,3]三唑并[1,5- a ]吡啶,并且大多数都是高产率或高产率。本方法还应用于[1,2,3]三唑[1,5- a ]的直接一锅合成。由2-酰基吡啶衍生物和肼一水合物形成的]吡啶。重要的是,这种负载的铜(II)催化剂可以通过简单的方法方便地从容易获得且廉价的试剂中获得,通过过滤反应混合物进行回收,并重复使用至少七次而不会显着降低催化活性。 在室温下,在MCM-41锚定的双齿2-氨基乙基氨基铜(II)催化剂[MCM-41-2N-在空气作为氧化剂的情况下,Cu(OAc)2 ]可以产生各种各样的[1,2,3]三唑并[1,5- a ]吡啶,并且大多数都是高产率或高产率。本方法还应用于[1,2,3]三唑[1,5- a ]的直接一锅合成。
Room Temperature Metal-Catalyzed Oxidative Acylation of Electron-Deficient Heteroarenes with Alkynes, Its Mechanism, and Application Studies
作者:Shweta Sharma、Mukesh Kumar、Ram A. Vishwakarma、Mahendra K. Verma、Parvinder Pal Singh
DOI:10.1021/acs.joc.8b01475
日期:2018.10.19
room-temperature, regioselective Minisci reaction for the acylation of electron-deficient heteroarenes with alkynes. The method has broad functional group compatibility and gives exclusively monoacylated products in good to excellent yields. The mechanistic pathway was analyzed based on a series of experiments confirming the involvement of a radical pathway. The 18O-labeling experiment suggested that water
5-Bromo-2-pyridylzinc reagent; direct preparation and its coupling reactions
作者:Reuben D. Rieke、Seung-Hoi Kim
DOI:10.1016/j.tetlet.2010.11.041
日期:2011.1
A facile synthetic route to the directpreparation of 5-bromo-2-pyridylzinc iodide has been developed. Treatment of 5-bromo-2-iodopyridine with active zinc gave rise to the selective oxidative addition to C–I bond under mild conditions. The resulting organozinc iodide has been used in the variety of coupling reactions affording the corresponding cross-coupling product.
Acetonitrile Derivatives as Carbonyl Synthons. One-Pot Preparation of Diheteroaryl Ketones via a Strategy of Sequential S<sub>N</sub>Ar Substitution and Oxidation
作者:Zhiwei Yin、Zhongxing Zhang、John F. Kadow、Nicholas A. Meanwell、Tao Wang
DOI:10.1021/jo030234b
日期:2004.2.1
addition of sodium peroxide and aqueous NH4OAc solution effected oxidation to afford aryl heteroaryl ketones in good yields. Aryl acetonitrile derivatives are thus umpolung-type synthons of the corresponding aryl carbonyl functionality.
2-芳基乙腈衍生物的阴离子与各种杂芳基氯化物或溴化物在S N Ar歧管中反应,得到易于氧化的中间阴离子。加入过氧化钠和NH 4 OAc水溶液进行氧化,以高收率得到芳基杂芳基酮。因此,芳基乙腈衍生物是相应的芳基羰基官能度的umpolung型合成子。
Chirality-Economy Catalysis: Asymmetric Transfer Hydrogenation of Ketones by Ru-Catalysts of Minimal Stereogenicity
catalysts that feature only a single stereogenic element, yet this minimal chirality resource is demonstrated to be competent for effecting high levels of stereoinduction in the asymmetrictransferhydrogenation over a broad range of ketone substrates, including those that are not accommodated by known catalyst systems. The single stereogenic center of the (1-pyridine-2-yl)methanamine) is the only point-chirality
The main side-products arise from direct, non-carbonylative cross-coupling. Under optimized conditions, benzoylpyridines are recovered in high yields (80–95%). The order of reactivity decreases from iodo- to bromopyridines and from 2-, 4- to 3-substituted halopyridines. The reactivity of dihalopyridines has been investigated; 2,6-dibromopyridine (7) and 3,5-dibromopyridine (11) are selectively transformed