The Ni(0)-catalyzed cross-coupling of alkenyl methylethers with boronicesters is described. Several types of alkenyl methylethers can be coupled with a wide range of boronicesters to give the stilbene derivatives.
Highly <i>E</i>-Selective, Stereoconvergent Nickel-Catalyzed Suzuki–Miyaura Cross-Coupling of Alkenyl Ethers
作者:Guo-Ming Ho、Heiko Sommer、Ilan Marek
DOI:10.1021/acs.orglett.9b00946
日期:2019.4.19
An improved method for the nickel-catalyzed Suzuki-Miyaura cross-coupling of alkenyl ethers is reported. This stereoconvergent protocol allows for the utilization of a wide range of alkenyl ethers and aryl boronic esters for the synthesis of variously substituted styrene derivatives. An olefinic mixture with respect to the alkenyl ethers can be employed, thereby circumventing the stereodefined synthesis of starting materials. Preliminary mechanistic investigations indicate a nickel-catalyzed olefin isomerization following initial stereoretentive cross-coupling.
Studies toward the Photochemical Synthesis of Functionalized [5]- and [6]Carbohelicenes
作者:Morwenna S. M. Pearson、David R. Carbery
DOI:10.1021/jo900785k
日期:2009.8.7
An efficient route to nonsymmetrical helical menthyl esters by means of an oxidative photocyclization reaction of dissymmetric bis-stilbenes is reported. The developed route allows the introduction of functionality on rings A, E, or F, and the influence of the substituent pattern on the photochemical reaction has been examined. Diastereoselectivity is observed when a double chiral induction strategy