Photocatalytic dual decarboxylative alkenylation mediated by triphenylphosphine and sodium iodide
作者:Hong-Yu Wang、Long-Jin Zhong、Gui-Fen Lv、Yang Li、Jin-Heng Li
DOI:10.1039/d0ob01242d
日期:——
alkenylation of α,β-unsaturatedcarboxylicacids and alkyl N-hydroxyphthalimide (NHP) esters mediated by triphenylphosphine and sodium iodide has been developed. This protocol proceeds under 456-nanometer irradiation by visible blue light in the absence of transition metals or organic dye based photoredox catalysts. The reaction is successfully applied to a wide range of redox-active esters derived from
Photoredox catalysis enabled alkylation of alkenyl carboxylic acids with N-(acyloxy)phthalimide via dual decarboxylation
作者:Kun Xu、Zhoumei Tan、Haonan Zhang、Juanli Liu、Sheng Zhang、Zhiqiang Wang
DOI:10.1039/c7cc05910h
日期:——
ruthenium based photoredox catalyst in combination with substoichiometric amount of 1,4-diazabicyclo[2.2.2]octane (DABCO) efficiently catalyzed dual decarboxylative couplings between alkenyl carboxylic acids and N-(acyloxy)phthalimides derived from aliphatic carboxylic acids, delivering alkylated styrene derivatives in a high regio- and stereo- selective manner under mild reaction conditions. Various types
Lewis-Acid-Catalyzed Benzylic Reactions of 2-Methylazaarenes with Aldehydes
作者:Dan Mao、Gang Hong、Shengying Wu、Xin Liu、Jianjun Yu、Limin Wang
DOI:10.1002/ejoc.201400073
日期:2014.5
Lewis-acid-catalyzedbenzylicreactions of 2-methylazaarenes with aldehydes have been investigated. Series of azaarene derivatives were afforded by this reaction. 2-(Pyridin-2-yl)ethanols with common substituents were formed through the LiNTf2-promoted aldol reaction for the first time. 2-Alkenylpyridines, exclusively in the form of the E isomers, were synthesized in the presence of LiNTf2 cooperated
已经研究了路易斯酸催化的 2-甲基氮杂芳烃与醛的苄基反应。该反应得到一系列氮杂芳烃衍生物。首次通过LiNTf2促进的羟醛反应形成了具有常见取代基的2-(Pyridin-2-yl)乙醇。在 LiNTf2 与 H2NTf 协同作用下,合成了仅以 E 异构体形式存在的 2-烯基吡啶。在La(Pfb)3催化下,2-甲基喹啉与醛类在空气中反应,以高收率得到2-烯基喹啉。
Copper-catalyzed oxidative decarboxylative alkylation of cinnamic acids with 4-alkyl-1,4-dihydropyridines
作者:Dong Zhang、Zi-Liang Tang、Xuan-Hui Ouyang、Ren-Jie Song、Jin-Heng Li
DOI:10.1039/d0cc06401g
日期:——
We have developed a new oxidative decarboxylation of cinnamic acids with 4-alkyl-1,4-dihydropyridines to construct C(sp3)-C(sp2) bond in the presence of copper catalyst and dicumyl peroxide (DCP). A variety of internal alkenes have been obtained with mild condition, broad substrates scope and excellent functional groups tolerance. This method has significant potential for application by using inexpensive
Peroxide promoted tunable decarboxylative alkylation of cinnamic acids to form alkenes or ketones under metal-free conditions
作者:Jing Ji、Ping Liu、Peipei Sun
DOI:10.1039/c5cc01762a
日期:——
In the presence of DTBP or DTBP/TBHP, the decarboxylative alkylation of cinnamic acids with alkanes gave alkenes and ketones respectively via a radical mechanism in moderate to good yields.