Two Tricyclic Adducts from consecutive additions of dimethyl acetylene-dicarboxylate to 2,4-DI-t-Butyl-3a,5a-dihydro-3H-cyclobutabpyrrole: A novel formation of cyclobuta1',2'-fpyrrolo1,2-boxazine derivative

摘要

The tricyclic heterocycles (2) and (3) were newly synthesized by the addition reaction between 2,4-di-t-butyl-3a,5a-dihydro-3H-cyclobutabpyrrole (1) and dimethyl acetylenedicarboxylate (DMAD).The structures were confirmed by the X-Ray structural analyses,and the pathway affording them was also proposed.