A new bench stable reagent that is easily synthesized and handled is investigated for its use in radical prenylation of diverse organic molecules. It has demonstrated high functional group compatibility and can be used with numerous photocatalytic methods to give prenylated products from aryl iodides, bromides, anilines, thiols and alkyl halides.
Linear-Selective Rhodium(I)-Catalyzed Addition of Arylboronic Acids to Allyl Sulfones
作者:Gavin C. Tsui、Mark Lautens
DOI:10.1002/anie.201004345
日期:2010.11.15
One step further: The rhodium(I)‐catalyzed addition of readily available arylboronic acids to allyl sulfones affords the linear (formal) hydroarylated products in good yields and excellent regioselectivities. The reaction broadens the scope of unactivated alkenes that can participate in rhodium‐catalyzed addition reactions.
Allyl aryl sulfones 2 react with aryl nitrocompounds 1 in a DBU/MgCl2 system giving the 4-arylsulfonyl quinolines 3. Some mechanisticaspects of the reaction are discussed. Application of this reaction to the formal total synthesis of the natural product (−)Eupolauramine is described.
A direct nitration of vinylcyclopropanes is disclosed with Cu(NO3)2 and KI in a regio- and stereoselective manner to afford nitroalkenes efficiently, where the cyclopropane skeleton was retained. The given method could be extended to other vinylcycles as well as biomolecule derivatives with wide substrate scope, good functionality tolerance, and efficient synthesis modularity. Further transformations
公开了用 Cu(NO 3 ) 2和 KI 以区域选择性和立体选择性方式对乙烯基环丙烷进行直接硝化,以有效地得到硝基烯烃,其中保留了环丙烷骨架。给定的方法可以扩展到其他乙烯基环以及具有广泛底物范围、良好功能耐受性和高效合成模块化的生物分子衍生物。进一步的转化表明所获得的产品是有机合成中的通用构建块。所提出的离子途径可以解释未接触的小环和反应过程中 KI 的影响。
Batch and flow electrochemical synthesis of allyl sulfones <i>via</i> sulfonation of allyl trifluoroborates: a robust, regioselective, and scalable approach
作者:Leonardo Mollari、Roberto del Río-Rodríguez、Jose A. Fernández-Salas、José Alemán
DOI:10.1039/d3gc02408c
日期:——
synthesis of allyl sulfones via sulfonation of allyl trifluoroborates. The process involves a radical addition to the alkene followed by the elimination of the trifluoroborate moiety, giving access to different substituted allyl sulfones. The efficacy of this reaction is attributed to the β-σ(C–B) stabilization of the electrochemically-generated intermediate carbocation, which plays a pivotal role in enforcing