作者:Shihua Song、Chunling Fu、Xin Huang、Shengming Ma
DOI:10.1002/adsc.201701407
日期:2018.3.1
An efficient access to tetrahydrofuran‐fused bicyclo[2.2.2]oct‐2‐enes via palladium‐catalyzed cyclization of oxygen‐tethered 2,7‐alkadiynylic carbonates with 2‐(buta‐2,3‐dienyl)malononitrile has been developed. Perfect chiral induction was observed when a substituent was introduced to the propargylic position affording the optically active polycyclic products of both enantiomers. Control experiments
通过钯催化氧连接的2,7-链二炔碳酸酯与2-(buta-2,3-dienyl)丙二腈的钯催化环化反应,可以有效地获得四氢呋喃稠合的双环[2.2.2] oct-2-烯。当将取代基引入炔丙基位置时,观察到完美的手性诱导,提供两种对映体的光学活性多环产物。对照实验表明,2,7-链二炔碳酸酯的氧链和艾伦中的两个氰基对于该转化是必不可少的。