Gold(I)-catalyzed cascade cyclization of 1,4-diyn-3-ones with a pyridine N-oxide enabled direct construction of a benzo[6,7]cyclohepta[1,2-b]furan scaffold with the formation of four bonds. This reaction would proceed through oxidative cyclization, alkynyl migration, and 5-endo-dig type cyclization. Synthesis of benzotropone-fused naphtho[1,2-b]furans through a two-step sequence, including epoxidation
金(I)催化吡啶N-氧化物对1,4-二炔-3-酮的级联环化可直接构建苯并[6,7]环庚[1,2- b ]呋喃骨架,形成四个债券。该反应将通过氧化环化,炔基迁移和5 -endo-dig型环化进行。还介绍了通过两步序列(包括环氧化和In(OTf)3催化的分子内碳-碳键形成)合成苯并萘酮稠合的萘并[1,2- b ]呋喃。