Direct Synthesis of Mono-α-arylated Ketones from Alcohols and Olefins via Ni-Catalyzed Oxidative Cross-Coupling
作者:Peng-Fei Yang、Wei Shu
DOI:10.1021/acs.orglett.0c02340
日期:2020.8.7
Controlled synthesis of α-monoarylated ketones is significant yet challenging due to the site-selectivity issues and nonproductive overarylation reactions. Herein, we reported the direct synthesis of α-arylated ketones enabled by Ni-catalyzed dehydrogenative cross-coupling reaction cascade between alcohols and olefins. The use of readily available and cost-effective alcohols and olefins provides a
Direct Deamination of Primary Amines by Water To Produce Alcohols
作者:Julia R. Khusnutdinova、Yehoshoa Ben-David、David Milstein
DOI:10.1002/anie.201301000
日期:2013.6.10
Just add water! The title reaction is catalyzed by an acridine‐based pincer complex (1, see scheme). This one‐step transformation uses water as the only reagent in the absence of additional bases, oxidants, or reductants. Cyclization of 1,4‐diaminobutane and 1,6‐diaminohexane catalyzed by 1 leads to the formation of pyrrolidine and azepane, respectively.
affordable ruthenium(II)-complexes as pre-catalysts in the transfer hydrogenation of carbonyl compounds in deep eutectic media is described for the first time. The eutectic mixture tetrabutylammonium bromide/formic acid = 1/1 (TBABr/HCOOH = 1/1) acts both as reaction medium and hydrogen source. The addition of a base is required for the process to occur. An extensive optimization of the reaction conditions has
Mild and Highly Selective Formyl Protection of Primary Hydroxyl Groups
作者:Lidia De Luca、Giampaolo Giacomelli、Andrea Porcheddu
DOI:10.1021/jo0257492
日期:2002.7.1
Efficient conversion of primary alcohols to the corresponding formate esters can be carried out at room temperature in methylene chloride, using 2,4,6-trichloro-1,3,5-triazine and N,N-dimethylformamide in the presence of lithium fluoride. This procedure appears as a valid method for selectively protecting primaryhydroxylgroups.
Catalytic S
<sub>N</sub>
Ar Hydroxylation and Alkoxylation of Aryl Fluorides
作者:Qi‐Kai Kang、Yunzhi Lin、Yuntong Li、Lun Xu、Ke Li、Hang Shi
DOI:10.1002/anie.202106440
日期:2021.9.6
mechanism of SNAr reactions involving metal arene complexes is hypothesized to involve a stepwise pathway (addition followed by elimination), experimental data that support this hypothesis is still under exploration. Mechanistic studies and DFTcalculations suggest either a stepwise or stepwise-like energy profile. Notably, we isolated a rhodium η5-cyclohexadienyl complex intermediate with an sp3-hybridized
亲核芳香取代 (S N Ar) 是一种通过用亲核试剂取代离去基团将杂原子结合到芳香环中的强大策略,但这种方法仅限于缺电子芳烃。我们现在已经建立了一种通过催化 S N Ar 反应获取苯酚和苯基烷基醚的可靠方法。该方法适用于广泛的富电子和中性芳基氟化物,它们在经典的 S N Ar 条件下呈惰性。虽然 S N的机制假设涉及金属芳烃配合物的 Ar 反应涉及逐步途径(添加后消除),支持该假设的实验数据仍在探索中。机械研究和 DFT 计算表明了一个逐步或逐步的能量分布。值得注意的是,我们分离了铑 η 5 -环己二烯基复合中间体,其具有带有亲核试剂和离去基团的 sp 3 -杂化碳。