Palladium(II) Acetate Catalyzed Reductive Heck Reaction of Enones; A Practical Approach
作者:Subramaniyan Mannathan、Saeed Raoufmoghaddam、Joost N. H. Reek、Johannes G. de Vries、Adriaan J. Minnaard
DOI:10.1002/cctc.201500760
日期:2015.12
A surprisingly practical Pd(OAc)2 or Pd(TFA)2‐catalyzed reductive Heckreaction between aryl iodides and α,β‐unsaturated ketones is described using N,N‐diisopropylethylamine (DIPEA, Hünigs base) as the reductant. In general, 1 mol % of Pd(OAc)2 is sufficient to afford good yields using electron‐rich or halogen‐substituted aryl iodides. Electron‐deficient aryl iodides preferentially give homocoupling
Palladium-catalyzed desulfitative addition of sodium sulfinates with α,β-unsaturated carbonyl compounds
作者:Wen Chen、Xianya Zhou、Fuhong Xiao、Jiaying Luo、Guo-Jun Deng
DOI:10.1016/j.tetlet.2012.06.026
日期:2012.8
A palladium-catalyzed desulfitative conjugate addition of sodium sulfinates with α,β-unsaturatedcarbonylcompounds is described. The reaction showed very good selectivity and tolerated a wide range of functionalities under an atmosphere of argon.
Ligand‐free palladium‐catalyzed tandem pathways for the synthesis of 4,4‐diarylbutanones and 4,4‐diaryl‐3‐butenones under microwave conditions
作者:Anna Wirwis、Anna M. Trzeciak
DOI:10.1002/aoc.4870
日期:2019.5
Two efficient Pd‐catalyzed tandem pathways for the synthesis of 4,4‐diaryl‐2‐butanones and 4,4‐diaryl‐3‐buten‐2‐ones were elaborated. The first step in both procedures was the Heck coupling of methyl vinyl ketone (MVK) and various aryl iodides leading to 4‐aryl‐3‐buten‐2‐one with the yield of up to 92% in 1 hr. The second step performed with the same catalyst and a new portion of aryl iodide in the
阐述了两种有效的Pd催化串联途径,用于合成4,4-二芳基-2-丁酮和4,4-二芳基-3-丁二酮。两种方法的第一步都是甲基乙烯基酮(MVK)与各种芳基碘化物的Heck偶联反应,生成4-芳基-3-丁烯-2-酮,在1小时内产率高达92%。第二步是在K 2 CO 3为碱的情况下,使用相同的催化剂和新的一部分碘代芳基化物,以高收率生产4,4-二芳基-3-丁烯-2-酮。当使用叔胺代替K 2 CO 3时,反应选择性完全变为饱和的4,4-二芳基-2-丁酮,还原性的Heck产物。由于施加了微波辐射(MW),使用0.5 mol%的Pd(OAc)2催化剂而没有额外的配体,可以在短时间内(4小时)以高收率获得所需的产物。