Non-Cryogenic, Ammonia-Free Reduction of Aryl Compounds
申请人:University of Pittsburgh - Of the Commonwealth System of Higher Education
公开号:US20220089508A1
公开(公告)日:2022-03-24
A method of reducing an aromatic ring or a cyclic, allylic ether in a compound includes preparing a reaction mixture including a compound including an aromatic moiety or a cyclic, allylic ether moiety, an alkali metal, and either ethylenediamine, diethylenetriamine, triethylenetetramine, or a combination thereof, in an ether solvent; and reacting the reaction mixture at from −20° C. to 30° C. for a time sufficient to reduce a double bond in the aromatic moiety to a single bond or to reduce the cyclic, allylic ether moiety.
The Diels–Alder reaction of in situ generated cyclohexa-1,3-dienes with methyl 4,4-diethoxybut-2-ynoate (1) followed by reverse Diels–Alder and hydrolysis affords substituted hydroxyphthalides in good yield.
Mechanochemical Approach for Air‐Tolerant and Extremely Fast Lithium‐Based Birch Reductions in Minutes
作者:Yunpeng Gao、Koji Kubota、Hajime Ito
DOI:10.1002/anie.202217723
日期:——
mechanochemical Birchreduction is reported for the first time. The newly developed ball-milling method does not require an inert atmosphere or other special precautions. Notably, the reaction completed within one minute for most of the investigated substrates. The present study thus provides a novel, operationally simple, rapid, and scalable alternative to conventional solution-based Birchreduction.
Mechanochemical Birch Reduction with Low Reactive Alkaline Earth Metals
作者:Jagadeesh Varma Nallaparaju、Riin Satsi、Danylo Merzhyievskyi、Tatsiana Jarg、Riina Aav、Dzmitry G. Kananovich
DOI:10.1002/anie.202319449
日期:——
Mechanochemical activation boosts reducing power of magnesium and calcium, allowing to utilize these metals as expedient reductants in ammonia-free Birch reaction in a ball mill at ambient conditions.
Preparation of 1‐Alkoxy‐1,3‐cyclohexadienes via Iron Complexation/Decomplexation
作者:Roger A. Rennels、John V. McClusky
DOI:10.1081/scc-120027712
日期:2004.12.31
A synthetic method for the preparation of 1-alkoxy-1,3-cyclohexadienes is presented. Iron complexation/decomplexation is used to produce and purify the desired compound without contamination of isomeric byproducts.