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.
作者:James Y. Hamilton、David Sarlah、Erick M. Carreira
DOI:10.1002/anie.201302731
日期:2013.7.15
No leaving group needed: With an Ir(P,olefin) complex as catalyst, the direct enantioselective allylic alkynylation of secondary allylic alcohols with potassium alkynyltrifluoroborates as alkynylating reagents has been achieved. High levels of enantioselectivity and high yields were achieved with this operationally easy and robust protocol, the use of which was demonstrated in the synthesis of GPR40 receptor agonist AMG 837. cod = 1,5-cyclooctadiene.