We systematically examined the effect of different esters on the rhodium-catalyzed intermolecular [5+2] cycloaddition of 3-acyloxy-1,4-enynes and alkynes with a concomitant 1,2-acyloxy migration. Significant rate acceleration was observed for benzoate substrates bearing an electron-donating substituent. The cycloaddition can now be conducted under much more practical conditions for most terminal alkynes.
我们系统地研究了不同酯对
铑催化下3-酰氧基-1,4-烯炔与
炔烃分子间[5+2]环加成反应及伴随的1,2-酰氧基迁移反应的影响。带有供电子取代基的
苯甲酸酯底物显著加速了反应速率。现在,对于大多数末端
炔烃,可以在更为实用的条件下进行这种环加成反应。