作者:Steven H. Bertz、G. Rihs、R.B. Woodward
DOI:10.1016/0040-4020(82)85046-1
日期:1982.1
A simple and efficient two-step preparation of bicyclo[3.3.0]octane-3,7-dione starting from the sodium enolate of dimethyl 3-ketoglutarate and glyoxal is described. This is an unprecedented case in which a condensation reaction of glyoxal is more successful under vigorous conditions (refluxing methanol) than under much milder ones (buffered water at ambient temperature). The major product (after h
描述了一种简单有效的两步制备双环[3.3.0]辛烷-3,7-二酮的方法,该方法从3-酮戊二酸二甲酯和乙二醛的烯醇钠开始。这是前所未有的情况,在剧烈条件下(回流甲醇),乙二醛的缩合反应比在温和条件下(环境温度下的缓冲水)更成功。与苯基乙二醛类似的序列的主要产物(在水解-脱羧后)是5,7-二羟基-4-甲氧基羰基-3-苯基-1-茚满酮,这是除了迈克尔和醛醇缩合反应之外的狄克曼反应的结果。仅后两种发生在水性缓冲液中,水解脱羧后的产物为1-苯基双环[3.3.0]辛烷-3,7-二酮。茚满酮的X射线晶体结构揭示了一种新颖的氢键现象。