Shi, Yong-Ling Shi, Min DABCO-Catalyzed Reaction of Allenic Esters and Ketones with Salicyl <i>N</i>-Tosylimines:  Synthesis of Highly Functionalized Chromenes DABCO-catalyzed reactions of salicyl <i>N</i>-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. Allenic Esters;chromene;Salicyl N;ethyl;Chromene;room temperature;Synthesi;dichloromethane;Tosylimine;penta;Ketone;Functionalized;butadienoate;tosylimine;yield;salicyl N 2005-07-07
    https://acs.figshare.com/articles/dataset/DABCO_Catalyzed_Reaction_of_Allenic_Esters_and_Ketones_with_Salicyl_i_N_i_Tosylimines_Synthesis_of_Highly_Functionalized_Chromenes/3278656
10.1021/ol051044l.s002