a selective phosphoranation of alkynes with phosphoniumcation, which directs a concise approach to isoquinolines from unactivated alkyne and nitrile feedstocks in a single step. Mechanistic studies suggest that the annulation reaction is initiated by the unprecedented phosphoranation of alkynes, thus representing a unique reaction pattern of phosphonium salts and distinguishing it from existing protocols
Palladium-catalyzed decarboxylative coupling reaction with alkynyl carboxylic acids and arylsiloxanes
作者:Jisun Jang、Gabriel Charles Edwin Raja、Ju-Hyeon Lee、Yujeong Son、Jimin Kim、Sunwoo Lee
DOI:10.1016/j.tetlet.2016.08.095
日期:2016.10
A decarboxylative coupling reaction for alkynyl carboxylic acids and arylsiloxanes was developed using a palladium catalyst. This method provided the desired coupled products in moderate to good yields by reacting the alkynyl carboxylic acids and arylsiloxanes with Pd(dba)2 (1.0 mol %), 1,1-bis(diphenylphosphino)methane (1.0 mol %), and AgF2 (2.0 equiv) at 60 °C for 6 h.
A novel catalyst-economic strategy with a recovered palladium catalyst was successfully applied for multi-task and maximum reuse in different types of one-by-one downstream reactions, from catalytic hydrogenation to Suzuki and Sonogashira-type cross-coupling reactions, Knoevenagel condensations, and trans-Knoevenagel-like condensations.
Polymer anchored 3-benzoyl-1-(1-benzylpiperidin-4-yl)-2-thiopseudourea-Pd(II) complex: An efficient catalyst for the copper and solvent free Sonogashira cross-coupling reaction
An efficient copper and solvent free Sonogashiracross-couplingreaction catalyzed by polymer supported 3-benzoyl-1-(1-benzylpiperidin-4-yl)-2-thiopseudourea-Pd(II) complex 4 (PS-bpt-Pd) was reported. This inexpensive and simply synthesized heterogeneous catalyst 4 afforded excellent yields of the cross-coupling products under mild reaction conditions. We have achieved high yields for aryl iodide coupling