Ethyl 1-benzyl-5-(1,3-dithiol-2-ylidene)-4,6-dioxopiperidine-3-carboxylate 、
碘乙烷 以whereby ethyl 1-benzyl-5-(1,3-dithiol-2-ylidene)-3-ethyl-4,6-dioxopiperidine-3-carboxylate (2.30 g, 79.3%) is obtained as pale yellow oil的产率得到ethyl 1-benzyl-5-(1,3-dithiol-2-ylidene)-3-ethyl-4,6-dioxopiperidine-3-carboxylate