N. Saravanan, M. Arthanareeswari, P. Kamaraj, and B. Sivakumar, “Efficient Synthesis of Quinolo-oxepanes Through [3+2] Cycloaddition Reaction of a,b-Unsaturated Ester with Unstabilized Azomethine Ylides”, ajc, vol. 27, no. 10, pp. 3667–3670, Jun. 2015.