[2+2] Cycloaddition Reactions of Butadienyl Ketene with 1,4-Diazabuta-1,3-dienes: Synthesis of Functionalized Butadienyl-4-iminomethyl-azetidin-2-ones and Butenylidene-butadienyl-[2,2 '-biazetidine]-4,4 '-diones

摘要

The reactions of butadienylketene with variety of 1,4-diazabuta-1,3-dienes are studied. The reactions resulted in the formation of previously unknown functionalized cis butadienyl-4-iminomethyl-azetidin-2-ones and butenylidene-butadienyl-[2,2'-biazetidine]-4,4'- diones. Butadienyl ketene reacts in [2+2] cycloaddition fashion with both iminic portion of 1,4-diazabuta-1,3-dienes and competitive [4+2] cycloaddition reaction of 1,4-diazabuta-1,3-dienes as 4 pi component with butadienyl ketene as 2 pi component are not observed.