Novel Deconjugative Esterification of 2-Cyclohexylideneacetic Acids through 4-(Pyrrolidin-1-yl)pyridine-catalyzed Carbodiimide Couplings
作者:Shigeki Sano、Etsuko Harada、Tomohiro Azetsu、Takashi Ichikawa、Michiyasu Nakao、Yoshimitsu Nagao
DOI:10.1246/cl.2006.1286
日期:2006.11
4-(Pyrrolidin-1-yl)pyridine-catalyzed deconjugative esterification of 2-cyclohexylideneacetic acids afforded isopropyl 2-(cyclohex-1-enyl)acetate by employing 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride as a coupling reagent. On the other hand, 4-(pyrrolidin-1-yl)pyridine-catalyzed esterification with 1,3-dicyclohexylcarbodiimide was not accompanied by deconjugation and gave isopropyl 2-cyclohexylideneacetate.
以 1-乙基-3-(3-二甲基氨基丙基)碳二亚胺盐酸盐为偶联试剂,4-(吡咯烷-1-基)吡啶催化的 2-环己基亚基乙酸脱共轭酯化反应生成了 2-(环己-1-烯基)乙酸异丙酯。另一方面,4-(吡咯烷-1-基)吡啶与 1,3-二环己基碳二亚胺催化的酯化反应不伴有解结合,得到 2-环己基亚基乙酸异丙酯。