Heck Arylation of Conjugated Alkenes with Aryl Bromides or Chlorides Catalyzed by Immobilization of Palladium in MCM-41
作者:Fang Yao、Jiaqin Liu、Mingzhong Cai
DOI:10.1007/s10562-013-1013-7
日期:2013.7
functionalized MCM-41-immobilized palladium(II) complex [MCM-41-2N-PdCl2] was conveniently synthesized from commercially available and cheap 3-(2-aminoethylamino)propyltrimethoxysilane via immobilization on MCM-41, followed by reacting with palladium chloride. It was found that this heterogeneous palladium complex is a highly efficient catalyst for Heck arylation of conjugated alkenes with aryl bromides
一种新的 3-(2-氨基乙基氨基)丙基功能化 MCM-41 固定化钯 (II) 络合物 [MCM-41-2N-PdCl2] 由市售且廉价的 3-(2-氨基乙基氨基)丙基三甲氧基硅烷通过固定在MCM-41,然后与氯化钯反应。发现这种多相钯配合物是使用四丁基溴化铵作为添加剂对共轭烯烃与芳基溴化物或氯化物进行 Heck 芳基化的高效催化剂,并且可以重复使用至少六次连续试验而不会降低活性。描述了使用 3-(2-氨基乙基氨基)丙基官能化的 MCM-41-固定化钯 (II) 络合物 [MCM-41-2N-PdCl2] 作为有效的多相催化剂,以 TBAB 作为添加剂,使用芳基溴化物或氯化物制备烯烃。
Catalytic, asymmetric difluorination of alkenes to generate difluoromethylated stereocenters
作者:Steven M. Banik、Jonathan William Medley、Eric N. Jacobsen
DOI:10.1126/science.aaf8078
日期:2016.7
difluoromethylated tertiary or quaternary stereocenters. The reaction uses commercially available reagents (m-chloroperbenzoic acid and hydrogen fluoride pyridine) and a simple chiral aryl iodide catalyst and is carried out readily on a gram scale. Substituent effects and temperature-dependent variations in enantioselectivity suggest that cation-π interactions play an important role in stereodifferentiation
Chlorosulphonyl Isocyanate Addition to<i>o</i>-Dialkylaminostyrenes: Preparation of 6-(<i>o</i>-Dialkylaminophenyl)-uracils
作者:Frank Hollywood、Hans Suschitzky、Roy Hull
DOI:10.1055/s-1982-29893
日期:——
The acid-mediated ring opening/cyclisation reaction of N-benzyl-α-aryl-azetidinones
作者:Frank D. King、Stephen Caddick
DOI:10.1016/j.tet.2012.09.046
日期:2012.11
N-Benzyl-4-aryl-azetidinones undergo ring opening with triflic acid to form N-benzyl-cinnamamides, which either undergo cyclisation to give 5-aryl-benzazepin-3-ones or N-debenzylation to give cinnamamides. (C) 2012 Elsevier Ltd. All rights reserved.
Shandala, Mowafak Y.; Al-Khashab, Abdul-Ilah Y.; Afzal, M., Journal of Heterocyclic Chemistry, 1980, vol. 17, p. 1605 - 1607
作者:Shandala, Mowafak Y.、Al-Khashab, Abdul-Ilah Y.、Afzal, M.、Ahmad, Shakir S.