Concise, diastereoconvergent synthesis of endiandric-type tetracycles by iterative cross coupling
作者:Eun Bin Go、Shannon P. Wetzler、Lee Joon Kim、Arthur Y. Chang、David A. Vosburg
DOI:10.1016/j.tet.2016.02.040
日期:2016.6
just seven steps each (longest linear sequence) from Burke's commercial cis-2-bromovinylboronic acid MIDA ester. Three iterative Suzuki–Miyaura couplings using MIDA boronates, including the first such example of a Z–Z coupling, trigger an 8π/6π-electrocyclization cascade. The mixture of endo and exo bicycles thus formed are elaborated into tetracycles via Horner–Wadsworth–Emmons and Diels–Alder reactions