Rhodium‐Catalyzed Annulations of 1,3‐Dienes and Salicylaldehydes/2‐Hydroxybenzyl Alcohols Promoted by 2‐Ethylacrolein
作者:Hong‐Shuang Li、Yang Xiong、Guozhu Zhang
DOI:10.1002/adsc.201800796
日期:2018.11.5
2‐ethylacrolein‐promoted protocol enables the annulation reactions of 1,3‐dienes with either salicylaldehydes or 2‐hydroxybenzyl alcohols leading to 2‐alkylchroman‐4‐ones with high regioselectivity. This research highlights the use of 2‐ethylacrolein which probably serves as a tool of bidentate coordination to rhodium intermediates. Mechanistic studies reveal that the transformation proceeds through the 1,4‐hydroacylation