A palladium‐catalyzed highly E‐selective triple cyclization of 2,7‐alkadiynylic carbonates with 2‐butyne‐1,4‐diol or 2‐butyne‐1,4‐disulfonamides to construct different tricycles such as 6,8‐dihydrobenzo[1,2‐c:3,4‐c′]difuran‐1(3H)‐one and 1,3,6,7‐tetrahydro‐8H‐furo[3,4‐e]isoindol‐8‐one derivatives has been reported. The alkene group produced and the nucleophilic unit kept in the product provide further
钯催化的2,7-链二炔
碳酸酯与
2-丁炔-1,4
-二醇或
2-丁炔-1,4-二磺
酰胺的
钯催化高E选择性
三环化反应,可构建不同的
三环化合物,例如6,8-二
氢苯并[1] ,2-C:3,4-C']二
呋喃-1(3 ħ) -
酮和1,3,6,7四
氢-8- ħ -
呋喃并[3,4-E]异
吲哚-8-
酮衍
生物具有被报道。产生的
烯基和产物中保留的亲核单元为构建更复杂的多环提供了进一步的机会。对照实验表明,该反应主要在内
酯化或内
酰胺化之前通过
炔烃的分子间插入。