Chen Ying-qi
2006
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Journal
Journal of Chemical Engineering of Chinese Universities
Abstract
5-[2-(ethylthio)propyl]-1,3-cyclohexanedione, the title compound of this study, is an important intermediate for preparation of 3-hydroxy-cyclohex-2-enones herbicides, such as clethodim, sethoxydim, cloproxydim, etc.. The optimization of the synthesis route and the preparation method of the title compound were studied and the results were described concisely as follows. Firstly, 3-ethylthiobutanal was prepared with high yield by reacting crotonaldehyde with ethanethiol in triethylamine. Secondly, methyl acetoacetate was converted to 6-ethylthiohept-3-en-2-one via three steps, hydrolysis, condensation with 3-ethylthiobutanal and dehydration, then the 6-ethylthiohept-3-en-2-one was cyclocondensed with di-Me malonate by Michael addition and Clasisen condensation, and further via saponification and decarboxylation , the title compound was obtained. The products of each steps and the final title compound obtained were compared with each its own standerd samples and were confirmed by LC/MS.