A Pd-Catalyzed Heteroannulation Approach to 2,3-Disubstituted Furo[3,2-c]coumarins
摘要:
The Pd-catalyzed cyclofunctionalization of 3-alkynyl-4-methoxycoumarins with aryl halides resulted In the selective formation of 3-arylfuro[3,2-c]coumarins in lieu of the expected regioisomeric 3-arylfuro[2,3-b]chromones. A mechanism involving the linear to angular rearrangement of a Pd-containing furan intermediate was proposed.
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
A Pd-Catalyzed Heteroannulation Approach to 2,3-Disubstituted Furo[3,2-<i>c</i>]coumarins
The Pd-catalyzed cyclofunctionalization of 3-alkynyl-4-methoxycoumarins with aryl halides resulted In the selective formation of 3-arylfuro[3,2-c]coumarins in lieu of the expected regioisomeric 3-arylfuro[2,3-b]chromones. A mechanism involving the linear to angular rearrangement of a Pd-containing furan intermediate was proposed.