Nickel-catalyzed decarboxylative coupling reaction of alkynyl carboxylic acids and allyl acetates
摘要:
The coupling reaction of aryl alkynyl carboxylic acids and allyl acetates was carried out in the presence of nickel catalyst to produce the allyl alkynes in good yields. The optimized condition is that alkynyl carboxylic acid (1.0 equiv), allyl acetate (2.0 equiv), Ni(OAc)(2)center dot 4H(2)O (10 mol %), AgOAc (10 mol %), and zinc (1.0 equiv) were reacted at 100 degrees C for 0.5 h. In addition, when allyl alcohol was employed instead of allyl acetate, the desired product was obtained in good yield. In addition, when the reaction was carried out in the presence of base such as DBU and Cs2CO3, the allene compounds were formed in good yield. (C) 2012 Elsevier Ltd. All rights reserved.
Gold- or Indium-Catalyzed Cross-Coupling of Bromoalkynes with Allylsilanes through a Concealed Rearrangement
作者:M. Elena de Orbe、Margherita Zanini、Ophélie Quinonero、Antonio M. Echavarren
DOI:10.1021/acscatal.9b02314
日期:2019.9.6
The gold(I)-catalyzed reaction of bromoalkynes with allylsilanes gives 1,4-enynes in a formal cross-coupling reaction. Mechanistic studies revealed the involvement of gold(I) vinylidenes or vinylidenephenonium gold(I) cations depending on the substituent on the bromoalkyne. In the case of bromo arylalkynes, the vinylidenephenonium gold(I) cations lead to 1,4-enynes via a 1,2-aryl rearrangement. The same reactivity has been observed in the presence of InBr3.