A straightforward synthetic approach to the spiroketal-enol ethers synthesis of natural antifeeding compound tonghaosu and its analogs
作者:Yang Gao、Wen-Lian Wu、Yu-Lin Wu、Bin Ye、Rong Zhou
DOI:10.1016/s0040-4020(98)00732-7
日期:1998.10
Tonghaosu 1, a natural product discovered from several plants of tribe Athemdeae, is a [4.4]spiroketal with an enediyne side-chain and shows interesting insect antifeeding activity. In this paper a general and convenient synthetic methodology for the synthesis of 1, 2 and its spiroketal-enol ether derivatives is described. Thus, 3-(2′-furyl)-propan-1-ol 7a or 4-(2′-furyl)-butan-1-ol 7b prepared from
Tonghaosu 1是一种从Athemdeae部落的几种植物中发现的天然产物,是具有烯二炔侧链的[4.4]螺酮,显示出有趣的昆虫拒食活性。在本文中,描述了用于合成1、2及其螺缩酮-烯醇醚衍生物的通用且方便的合成方法。因此,用正丁基锂和不饱和醛处理由糠醛制得的3-(2'-呋喃基)-丙烷-1-醇7a或4-(2'-呋喃基)-丁-1-醇7b,得到二醇5。二醇5还可从5-(3-乙酰氧基丙基)-2-呋喃甲醛或5-(4-乙酰氧基丁基)-2-呋喃醛和炔基锂获得。通过用酸仔细处理5或7,发生脱水环化反应,以中等至极好的收率得到所需的螺酮基-烯醇醚。