The Diels-Alder and ring enlargement reactions of 1-cyclobutenyl ketones. Preparation of 1-acetyl-1,3,5-cyclooctatrienes
作者:Tooru Fujiwara、Tohru Ohsaka、Tomoya Inoue、Takeshi Takeda
DOI:10.1016/s0040-4039(00)82326-6
日期:1988.1
The Diels-Alder reaction of 1-cyclobutenyl ketones with various 1,3-dienes in the presence of Lewis acid as a catalyst gave cycloadducts in good yields. 4-Acetylcyclooctadienones and 1-acetyl-1,3,5-cyclooctatrienes are obtained via the bicyclo[4.2.0]octa-2,4-dienes by the transformation to the trimethylsilyl enol ether or the allylic bromination with N-bromosuccinimide followed by dehydrobromination
在路易斯酸作为催化剂的存在下,1-环丁烯基酮与各种1,3-二烯的Diels-Alder反应以良好的收率得到环加合物。通过双环[4.2.0]八-2,4-二烯通过转化为三甲基甲硅烷基烯醇醚或用N-溴代琥珀酰亚胺进行烯丙基溴化反应,再得到4-乙酰基环辛二烯酮和1-乙酰基-1,3,5-环辛烯酮。环加合物的脱氢溴化作用。