A highly diastereoselective three-component inverse-electron-demand aza DielsâAlder reaction assisted by per(poly)fluoro-alkanesulfinamides is presented, providing a broad spectrum of highly functionalized piperidine derivatives with excellent endo/exo and facial diastereoselectivities. The electron-withdrawing perfluoroalkyl groups are crucial for the success of this reaction under mild conditions and facilitate monitoring the process and stereoselectivities of the reaction. The synthetic potential of these cycloadducts is also highlighted.
CINCHONINE-DERIVED CATALYSTS AND METHODS OF USING SAME
申请人:BRANDEIS UNIVERSITY
公开号:US20200048243A1
公开(公告)日:2020-02-13
The present invention includes certain conchinine-derived phase-transfer catalysts of formula (I), compositions comprising the same, and methods of promoting asymmetric addition reactions using the same.
Metal-free and highly regioselective synthesis of N-heteroaryl substituted pyrazoles from α,β-unsaturated N-tosylhydrazones and heteroaryl chlorides
作者:Lin Zeng、Xiao-Qiang Guo、Zai-Jun Yang、Ya Gan、Lian-Mei Chen、Tai-Ran Kang
DOI:10.1016/j.tetlet.2019.07.034
日期:2019.8
β-unsaturated N-tosylhydrazones with N-heteroaryl chlorides was developed for the synthesis of N-heteroaryl pyrazole derivatives. This one-pot reaction provided bi(heteroaryl) derivatives in good to excellent yields and with excellent regioselectivity. The procedure is operationally simple and applicable to large-scale synthesis.
Isomeric fluorinated α‐bromoenones react with dinucleophilic β‐mercaptoalcohols in CH2Cl2 at room temperature in the presence of Et3N in a multistep process. Depending on the position of the CF3 group, different O,S‐heterocycles or non‐cyclic products were obtained. With 3‐bromo‐1,1,1‐trifluorobut‐3‐en‐2‐ones derivatives of 1,4‐oxathianes were formed, but isomeric2‐bromo‐4,4,4‐trifluorobut‐2‐en‐1‐ones
Experimental and Theoretical Study of an Intramolecular CF<sub>3</sub>-Group Shift in the Reactions of α-Bromoenones with 1,2-Diamines
作者:Vasily M. Muzalevskiy、Yury A. Ustynyuk、Igor P. Gloriozov、Vyacheslav A. Chertkov、Alexander Yu. Rulev、Evgeniy V. Kondrashov、Igor A. Ushakov、Alexey R. Romanov、Valentine G. Nenajdenko
DOI:10.1002/chem.201502706
日期:2015.11.16
The reactions of trifluoromethylated 2‐bromoenones and N,N′‐dialkyl‐1,2‐diamines have been studied. Depending on the structures of the starting compounds, the formation of 2‐trifluoroacetylpiperazine or 3‐trifluoromethylpiperazine‐2‐ones was observed. The mechanism of the reaction is discussed in terms of multistep processes involving sequential substitution of bromine in the starting α‐bromoenones