DABCO-catalyzed reaction of allenic esters and ketones with salicyl N-tosylimines: synthesis of highly functionalized chromenes.
[reaction: see text] DABCO-catalyzed reactions of salicyl N-tosylimines with ethyl 2,3-butadienoate and penta-3,4-dien-2-one proceed smoothly at room temperature in dichloromethane to give the corresponding chromenes in good to excellent yields.
State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences.
Yong-Ling
YL
Shi
Min
M
Shi