ICBMS, Institut de Chimie et Biochimie Moléculaire et Supramoléculaire, CNRS UMR 5246, Université Lyon 1, ESCPE Lyon 43, Boulevard du 11 Novembre 1918, 69622 Villeurbanne, France.
Org Lett. 2009 Nov 19;11(22):5254-7. doi: 10.1021/ol902189q.
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.
钯催化的 3-炔基-4-甲氧基香豆素与芳基卤化物的环官能化反应,选择性地生成了 3-芳基呋喃并[3,2-c]香豆素,而不是预期的区域异构体 3-芳基呋喃并[2,3-b]色酮。提出了一种涉及含钯呋喃中间体的线性到角重排的反应机制。