Microwave-enhanced cross-coupling of allyl chlorides with vinyltrifluoroborates
作者:George W. Kabalka、Eric Dadush、Mohammad Al-Masum
DOI:10.1016/j.tetlet.2006.08.043
日期:2006.10
The allylation of potassium alkenyltrifluoroborates with allyl chloride via a palladiumcatalyzedcross-couplingreaction occurs rapidly undermicrowaveirradiation. The allylation reaction produces 1,4-pentadienes in high yields.
Palladium-Catalyzed Cross-Coupling Reactions of Potassium Alkenyltrifluoroborates with Organic Halides in Aqueous Media
作者:Emilio Alacid、Carmen Nájera
DOI:10.1021/jo802356n
日期:2009.3.20
cross-coupled with aryl and heteroaryl bromides using 1 mol % Pd loading of 4-hydroxyacetophenone oxime derived palladacycle or Pd(OAc)2 as precatalysts, K2CO3 as base, and TBAB as additive and water reflux under conventional or microwave heating to afford styrenes, stilbenoids, and alkenylbenzenes. These borates can be cross-coupled diastereoselectively with allyl and benzylchlorides using KOH as base
乙烯基和烯基三氟硼酸钾与芳基和杂芳基溴化物进行交叉偶联,使用1摩尔%的4-羟基苯乙酮肟衍生的palladacycle或Pd(OAc)2作为Pd的前催化剂,K 2 CO 3在常规或微波加热下,作为碱和TBAB作为添加剂并进行水回流,得到苯乙烯,二苯乙烯类化合物和烯基苯。这些硼酸盐可以在丙酮水(3:2)中,在50°C和0.1 mol%Pd负载下,使用KOH作为碱,与烯丙基氯和苄基氯进行非对映选择性交联,分别得到相应的1,4-二烯和烯丙基芳烃。这些简单的无膦反应条件允许通过萃取分离包含58-105 ppm Pd的产物,在多达五次运行中从水相中回收钯。
Cross-Coupling Synthesis of Methylallyl Alkenes: Scope Extension and Mechanistic Study
Cross-coupling reactions between 2-methyl-2-propen-1-ol and various boronic acids are used to obtain aromatic-(2-methylallyl) derivatives. However, deboronation or isomerization side reactions may occur for several boronic acids. We describe herein the synthesis of original alkenes with good yields under mild reaction conditions that decrease these side reactions. The scope of this environmentally benign reaction is thereby extended to a wide variety of boronic acids. A mechanistic study was conducted and suggested a plausible catalytic cycle mechanism, pointing to the importance of the Lewis acidity of the boronic acid used.
Nickel-Catalyzed Allylic Substitution of Simple Alkenes
作者:Ryosuke Matsubara、Timothy F. Jamison
DOI:10.1002/asia.201000875
日期:2011.7.4
This report describes a nickel‐catalyzed allylic substitution process of simplealkenes whereby an important structural motif, a 1,4‐diene, was prepared. The key to success is the use of an appropriate nickel–phosphine complex and a stoichiometric amount of silyl triflate. Reactions of 1‐alkyl‐substituted alkenes consistently provided 1,1‐disubstituted alkenes with high selectivity. Insight into the
Nickel-Catalyzed Cross-Coupling of Allyl Alcohols with Aryl- or Alkenylzinc Reagents
作者:Bo Yang、Zhong-Xia Wang
DOI:10.1021/acs.joc.6b02564
日期:2017.5.5
Nickel-catalyzed cross-coupling of allylalcohols with aryl- and alkenylzinc chlorides through C–O bond cleavage was performed. Reaction of (E)-3-phenylprop-2-en-1-ol and 1-aryl-prop-2-en-1-ols with aryl- or alkenylzinc chlorides gave linear cross-coupling products. Reaction of 1-phenyl- or 1-methyl-substituted (E)-3-phenylprop-2-en-1-ol with aryl- or alkenylzinc chlorides resulted in 3-aryl/alkenyl-substituted
进行了镍醇与烯丙基氯化锌和烯基氯化锌通过C–O键裂解的镍催化交叉偶联反应。(E)-3-苯基丙-2-烯-1-醇和1-芳基丙-2-烯-1-醇与芳基或烯基氯化锌的反应得到线性交叉偶联产物。1-苯基或1-甲基取代的(E)-3-苯基丙-2-烯-1-醇与芳基或烯基氯化锌的反应生成3-芳基/烯基取代的(E)-(prop-1 -烯-1,3-二基)二苯或3-芳基/烯基取代的(E)-(丁-1-烯基)苯。烯丙醇与p -Me 2 NC 6 H 4 ZnCl的反应生成正常偶联产物4-烯丙基-N,N的混合物-二甲基苯胺及其异构化产物N,N-二甲基-4-(丙-1-烯-1-基)苯胺。