提出了一种在无金属条件下通过甲基烯醇醚与 4-羟基香豆素反应来简便地一步合成二氢呋喃-[3,2- c ]色酮和呋喃[3,2 - c ]色酮的方法。通过控制三氟化硼乙醚合物的化学计量,选择性地得到二氢呋喃[3,2- c ]色酮和呋喃[3,2- c ]-色酮。据报道,芳基迁移后呋喃部分芳构化,导致各种呋喃[3,2- c ]色烯酮衍生物的收率良好。
Palladium-Catalyzed [2+2+1] Oxidative Annulation of 4-Hydroxycoumarins with Unactivated Internal Alkynes: Access to Spiro Cyclopentadiene-Chroman-2,4-dione Complexes
作者:Shiyong Peng、Tao Gao、Shaofa Sun、Yanhong Peng、Minghu Wu、Haibing Guo、Jian Wang
DOI:10.1002/adsc.201300893
日期:2014.2.10
AbstractHerein, we report our new results regarding a palladium‐catalyzed [2+2+1] oxidative annulation of 4‐hydroxycoumarins with unactivated internal alkynes, which affords a new class of compounds: the spiro cyclopentadiene‐chroman‐2,4‐diones.magnified image
BAKRE, K. M.;MERCHANT, J. R., INDIAN J. CHEM., 1981, 20, N 7, 614-615