Diethylzinc-Mediated Radical 1,2-Addition of Alkenes and Alkynes
作者:Xin Li、Songtao He、Qiuling Song
DOI:10.1021/acs.orglett.1c00669
日期:2021.4.16
A novel diethylzinc-mediated radical 1,2-addition of perfluoroalkyl iodides to unactivatedalkenes and alkynes is presented, which demonstrates a novel way to generate an ethyl difluoroacetate radical. This method is highly efficient and gives full conversions of the substrates, high yields of the products, and negligible byproducts and requires no column chromatography purifications. The mild conditions
The synthesis of a bicyclic enediyne capable of photosensitive triggering and conjugated to a pyrrole-imidazole polyamide is described. Using UV irradiation, this hybrid molecule is shown to exhibit 100-fold stronger potency for DNA cleavage, in an in vitro assay, as compared to the enediyne without the DNA-localizing pyrrole-imidazole.
Catalytic One-Pot Synthesis of Cyclic Amidines by Virtue of Tandem Reactions Involving Intramolecular Hydroamination under Mild Conditions
作者:Sukbok Chang、Minjae Lee、Doo Young Jung、Eun Jeong Yoo、Seung Hwan Cho、Sun Kyu Han
DOI:10.1021/ja064788i
日期:2006.9.1
A newsynthetic methodology for the generation of cyclic amidines has been developed by the reaction of 1,n-aminoalkynes with electron-deficient azides using a ruthenium catalyst at ambient temperature. The reaction proceeds most likely via a tandem sequence of intramolecular hydroamination of aminoalkynes, cycloaddition of azides with the resulting enamines, and rearrangement of triazoline intermediates
Hydrotrifluoromethylation of Unactivated Alkenes and Alkynes Enabled by an Electron-Donor–Acceptor Complex of Togni’s Reagent with a Tertiary Amine
作者:Yuanzheng Cheng、Shouyun Yu
DOI:10.1021/acs.orglett.6b01301
日期:2016.6.17
and a tertiary amine has been introduced. The existence of this EDA complex was supported by NMR titration experiments. The hydrotrifluoromethylation of unactivated aliphatic alkenes and alkynes enabled by this EDA complex has also been developed. This hydrotrifluoromethylation protocol is operationally simple and promoted by a tertiary amine.
A Diastereocontrolled Route to 10-Arylpyrrolo[1,2-<i>b</i>]isoquinolines
作者:Irantzu Couto、Leticia M. Pardo、Imanol Tellitu、Esther Domínguez
DOI:10.1021/jo302287v
日期:2012.12.21
design that involves two key cyclization steps. First, the iodine(III)-mediated reaction of a series of N-benzylpentynamides leads to the generation of the 5-aroylpyrrolidinone skeletons. Finally, after reduction of the generated ketone group into the corresponding carbinol, the effect of a number of different acidic conditions was studied to assist the second cyclization step that occurs through an
通过涉及两个关键环化步骤的合成设计,可实现一系列10-芳基取代的吡咯并异喹啉的非对映控制制备。首先,碘(III)介导的一系列N-苄基戊炔酰胺的反应导致生成5-芳基吡咯烷二酮骨架。最后,在将生成的酮基还原为相应的甲醇后,研究了许多不同酸性条件的影响,以协助通过芳族亲电取代过程发生的第二个环化步骤。对这一步骤的立体化学过程的研究使我们得出结论,它是通过具有非常高(> 95%的抗)非对映异构控制的S N 1机制发生的。