881038-07-9Relevant academic research and scientific papers
Asymmetric Synthesis of Dihydropyranones via Gold(I)-Catalyzed Intermolecular [4+2] Annulation of Propiolates and Alkenes
Choi, Su Yeon,Kim, Hanbyul,Shin, Seunghoon
, p. 13130 - 13134 (2018/09/21)
Intermolecular asymmetric gold catalysis involving alkyne activation presents a significant challenge due to its distinct mechanistic mode from other metals. Herein, we report a highly enantioselective synthesis of α,β-unsaturated δ-lactones from [4+2] annulation of propiolates and alkenes in upto 95 percent ee. Notably, for the desired chiral recognition, the choice of 1,1,2,2-tetrachloroethane as solvent was found to be crucial. Furthermore, an anionic surfactant (sodium dodecyl sulfate) improved the product selectivity in the divergence of the cyclopropyl gold carbene intermediate.
