Palladium‐Catalyzed Triple Cyclization of 2,7‐Alkadiynylic Carbonates with 2‐Butyne‐1,4‐diol or 2‐Butyne‐1,4‐disulfonamides
作者:Yulong Song、Wangteng Wu、Chunling Fu、Xin Huang、Shengming Ma
DOI:10.1002/adsc.201900162
日期:2019.7.2
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。