Neutral-Eosin Y-Catalyzed Regioselective Hydroacylation of Aryl Alkenes under Visible-Light Irradiation
作者:Xinxin Tang、Jie Wu、Haiwang Liu、Fei Xue、Mu Wang
DOI:10.1055/a-1319-6237
日期:2021.3
The hydroacylation of styrene derivatives were achieved by employing neutral eosin Y as a direct hydrogen atom transfer (HAT) catalyst under visible-light irradiation. Exclusive anti-Markovnikov selectivity could be obtained. Aldehydes and styrenes with various substituents were tolerated (>20 examples) to achieve products with moderate to high yields. The key acyl radical intermediate was generated
通过在可见光照射下使用中性曙红 Y 作为直接氢原子转移 (HAT) 催化剂来实现苯乙烯衍生物的加氢酰化。可以获得独特的抗马尔科夫尼科夫选择性。可以容忍具有各种取代基的醛和苯乙烯(> 20 个例子)以实现中等至高产率的产品。关键的酰基自由基中间体由光激发的曙红 Y 诱导的直接 HAT 过程产生。随后加入苯乙烯和反向 HAT 过程产生酮产物。
CRTH2 MODULATORS
申请人:MERMERIAN Ara
公开号:US20110150834A1
公开(公告)日:2011-06-23
Modulators of CRTH2, particularly antagonists of CRTH2, that are useful for treating various disorders, including asthma and respiratory disorders are disclosed. The compounds fall within a genus described by formula I:
Synthesis of 1,4-diketones by fluoride-catalysed Michael addition and supported permanganate oxidation
作者:James H. Clark、David G. Cork
DOI:10.1039/c39820000635
日期:——
A wide variety of 1,4-diketones may be prepared from simple starting materials by using fluoride ion-catalysed Michaeladditions and silica gel-supported permanganate-promoted Nef transformations.
Thulium Triflate Catalyzed Hydration of 2-Substituted 4-Alkynones
作者:M.-Y. Chang、Y.-C. Cheng
DOI:10.1055/s-0035-1561652
日期:——
We report on a facile synthetic route for the preparation of substituted 1,4-diketones by thulium triflate mediated hydration of substituted 4-alkynones in MeNO 2 at 25 °C for five hours. The products were obtained in moderate to high yields.
我们报告了通过三氟甲磺酸铥介导的取代 4-炔酮在 MeNO 2 中在 25°C 下水合 5 小时制备取代 1,4-二酮的简便合成路线。以中等至高产率获得产物。
One-Step Synthesis of 1,4-Diketones by Nucleophilic Reaction to Tricarbonyl Complexes of α,β-Unsaturated Ketones
Tricarbonyliron complexes of 3-buten-2-one, 3-penten-2-one, and 4-phenyl-3-buten-2-one reacted with organolithium and Grignard reagents to afford 1,4-diketones in one step, some of the products are amenable to convertion to natural products.