Rhodium‐Catalyzed [4+2+1] Cycloaddition of In Situ Generated Ene/Yne‐Ene‐Allenes and CO
作者:Zi‐You Tian、Qi Cui、Cheng‐Hang Liu、Zhi‐Xiang Yu
DOI:10.1002/anie.201805908
日期:2018.11.19
rhodium‐catalyzed [4+2+1] cycloaddition of in situ generated ene/yne‐ene‐allenes and CO to synthesize challenging seven‐membered carbocycles fused with five‐membered rings. This reaction is designed based on the 1,3‐acyloxy migration of ene/yne‐ene‐propargyl esters to ene/yne‐ene‐allenes, followed by oxidative cyclization, CO insertion, and reductive elimination to form the final [4+2+1] cycloadducts.
本文报道了原位生成的烯/炔-烯-烯和CO的首次铑催化的[4 + 2 + 1]环加成反应,以合成具有挑战性的五元环七元碳环。该反应的设计基于烯/炔-炔丙基酯的1,3-酰氧基迁移至烯/炔-烯丙烯,然后进行氧化环化,CO插入和还原消除,以形成最终的[4 + 2 +1]个加合物。不赞成可能的竞争性[4 + 1],[4 + 2]和[2 + 2 + 1]环加成反应,使本反应成为访问官能化5/7环的有效途径。