Lewis Acid‐Catalyzed Intramolecular [3+2] Cycloaddition of Cyclopropane 1,1‐Diesters with Alkynes for the Synthesis of Cyclopenta[
<i>c</i>
]chromene Skeletons
作者:Xiao‐Feng Xia、Xian‐Rong Song、Xue‐Yuan Liu、Yong‐Min Liang
DOI:10.1002/asia.201200104
日期:2012.7
An efficient method to construct cyclopenta[c]chromene skeletons by Lewis acid‐catalyzed intramolecular [3+2] cycloaddition of cyclopropane 1,1‐diesters with alkynes is presented. Two new fused cycles can be formed in one step in moderate to excellent yields (up to 94 %), and the products can be converted into bioactive barbituric acid derivatives (1) under simple reaction conditions.
提出了一种有效的方法,该方法通过路易斯酸催化的环丙烷1,1-二酯的分子内[3 + 2]环加成炔与环炔构筑环戊[ c ]色烯骨架。可以在一个步骤中以中等至极好的产率(高达94%)形成两个新的熔合循环,并且可以在简单的反应条件下将产物转化为具有生物活性的巴比妥酸衍生物(1)。